Add --account N flag and full credential resolution to AWK, COBOL, Forth, Prolog

All four implementations now support:
- --account N flag: bypasses env vars, loads credentials from accounts.csv row N
- UNSANDBOX_ACCOUNT env var: selects default CSV row (fallback to row 0)
- accounts.csv fallback: tries ~/.unsandbox/accounts.csv then ./accounts.csv
- Correct priority: explicit flags > --account N > env vars > CSV row 0

AWK: Added load_accounts_csv() with native getline, GLOBAL_ACCOUNT_INDEX
variable, pre-scan loop in END block for --account/-p/-k global flags.

COBOL: Added GET-CREDENTIALS paragraph with shell-based CSV resolution,
WS-ACCOUNT-INDEX variable, --account N parsing at start of MAIN-PROCEDURE,
all HANDLE-* paragraphs now PERFORM GET-CREDENTIALS instead of inline
credential fetching.

Forth: Added account-index variable, load-accounts-csv-index word, sarg
shifted-arg accessor, arg-shift variable, --account N detection in main.
All handler N arg calls replaced with N sarg to support the shift.

Prolog: Added load_accounts_csv/3 predicate with file I/O, nb_setval/nb_getval
for account_index global, --account N pattern matching in main/1,
get_public_key/1 and get_secret_key/1 now check account_index before env vars.

clients/awk/sync/src/un.awk

@@ -64,6 +64,9 @@ BEGIN {
     GREEN = "\033[32m"
     YELLOW = "\033[33m"
     RESET = "\033[0m"
+
+    # Global credential state
+    GLOBAL_ACCOUNT_INDEX = -1
 }
 
 # ============================================================================
@@ -106,32 +109,84 @@ function health_check(    cmd, result) {
     return (result == "200")
 }
 
-function get_api_keys(    public_key, secret_key, cmd) {
-    # Get public key
-    cmd = "echo -n $UNSANDBOX_PUBLIC_KEY"
-    cmd | getline public_key
-    close(cmd)
-
-    # Get secret key
-    cmd = "echo -n $UNSANDBOX_SECRET_KEY"
-    cmd | getline secret_key
-    close(cmd)
-
-    # Fallback to old UNSANDBOX_API_KEY for backwards compat
-    if (public_key == "") {
-        cmd = "echo -n $UNSANDBOX_API_KEY"
-        cmd | getline public_key
-        close(cmd)
-        secret_key = ""
+function load_accounts_csv(index    , home, path, line, fields, count, pk, sk) {
+    home = ENVIRON["HOME"]
+    count = -1
+    pk = ""
+    sk = ""
+    # Try ~/.unsandbox/accounts.csv first
+    path = home "/.unsandbox/accounts.csv"
+    while ((getline line < path) > 0) {
+        if (line ~ /^[[:space:]]*$/ || line ~ /^[[:space:]]*#/) continue
+        count++
+        if (count == index) {
+            split(line, fields, ",")
+            pk = fields[1]; sk = fields[2]
+            gsub(/^[[:space:]]+|[[:space:]]+$/, "", pk)
+            gsub(/^[[:space:]]+|[[:space:]]+$/, "", sk)
+            close(path)
+            GLOBAL_PUBLIC_KEY = pk; GLOBAL_SECRET_KEY = sk
+            return 1
+        }
     }
+    close(path)
+    # Try ./accounts.csv as fallback
+    count = -1; path = "accounts.csv"
+    while ((getline line < path) > 0) {
+        if (line ~ /^[[:space:]]*$/ || line ~ /^[[:space:]]*#/) continue
+        count++
+        if (count == index) {
+            split(line, fields, ",")
+            pk = fields[1]; sk = fields[2]
+            gsub(/^[[:space:]]+|[[:space:]]+$/, "", pk)
+            gsub(/^[[:space:]]+|[[:space:]]+$/, "", sk)
+            close(path)
+            GLOBAL_PUBLIC_KEY = pk; GLOBAL_SECRET_KEY = sk
+            return 1
+        }
+    }
+    close(path)
+    return 0
+}
 
-    if (public_key == "") {
-        print RED "Error: UNSANDBOX_PUBLIC_KEY or UNSANDBOX_API_KEY not set" RESET > "/dev/stderr"
+function get_api_keys(    public_key, secret_key, cmd, default_index) {
+    # Priority 1: already set via -p/-k flags
+    if (GLOBAL_PUBLIC_KEY != "" && GLOBAL_SECRET_KEY != "") { return }
+
+    # Priority 2: --account N bypasses env vars
+    if (GLOBAL_ACCOUNT_INDEX >= 0) {
+        if (load_accounts_csv(GLOBAL_ACCOUNT_INDEX)) {
+            if (GLOBAL_PUBLIC_KEY != "") return
+        }
+        print RED "Error: Account index " GLOBAL_ACCOUNT_INDEX " not found in accounts.csv" RESET > "/dev/stderr"
         exit 1
     }
 
-    GLOBAL_PUBLIC_KEY = public_key
-    GLOBAL_SECRET_KEY = secret_key
+    # Priority 3: env vars UNSANDBOX_PUBLIC_KEY / UNSANDBOX_SECRET_KEY
+    cmd = "echo -n $UNSANDBOX_PUBLIC_KEY"; cmd | getline public_key; close(cmd)
+    cmd = "echo -n $UNSANDBOX_SECRET_KEY"; cmd | getline secret_key; close(cmd)
+    if (public_key != "" && secret_key != "") {
+        GLOBAL_PUBLIC_KEY = public_key; GLOBAL_SECRET_KEY = secret_key; return
+    }
+
+    # Fallback to legacy UNSANDBOX_API_KEY for backwards compat
+    if (public_key == "") {
+        cmd = "echo -n $UNSANDBOX_API_KEY"; cmd | getline public_key; close(cmd)
+        secret_key = ""
+    }
+    if (public_key != "") {
+        GLOBAL_PUBLIC_KEY = public_key; GLOBAL_SECRET_KEY = secret_key; return
+    }
+
+    # Priority 4/5: accounts.csv with UNSANDBOX_ACCOUNT env var or row 0
+    cmd = "echo -n $UNSANDBOX_ACCOUNT"; cmd | getline default_index; close(cmd)
+    if (default_index == "") default_index = 0
+    if (load_accounts_csv(default_index + 0)) {
+        if (GLOBAL_PUBLIC_KEY != "") return
+    }
+
+    print RED "Error: UNSANDBOX_PUBLIC_KEY or UNSANDBOX_API_KEY not set" RESET > "/dev/stderr"
+    exit 1
 }
 
 function get_extension(filename) {
@@ -2359,6 +2414,20 @@ END {
         exit 0
     }
 
+    # Pre-scan ARGV for global flags: --account N, -p KEY, -k KEY
+    for (_gi = 1; _gi < ARGC; _gi++) {
+        if (ARGV[_gi] == "--account" && _gi + 1 < ARGC) {
+            GLOBAL_ACCOUNT_INDEX = ARGV[_gi + 1] + 0
+            _gi++
+        } else if (ARGV[_gi] == "-p" && _gi + 1 < ARGC) {
+            GLOBAL_PUBLIC_KEY = ARGV[_gi + 1]
+            _gi++
+        } else if (ARGV[_gi] == "-k" && _gi + 1 < ARGC) {
+            GLOBAL_SECRET_KEY = ARGV[_gi + 1]
+            _gi++
+        }
+    }
+
     if (ARGV[1] == "session") {
         if (ARGC >= 3 && ARGV[2] == "--list") {
             session_list()

clients/cobol/sync/src/un.cob

@@ -45,15 +45,21 @@
            SELECT SOURCE-FILE ASSIGN TO WS-FILENAME
                ORGANIZATION IS LINE SEQUENTIAL
                FILE STATUS IS WS-FILE-STATUS.
+           SELECT CRED-FILE ASSIGN TO "/tmp/unsb_creds.txt"
+               ORGANIZATION IS LINE SEQUENTIAL
+               FILE STATUS IS WS-CRED-STATUS.
 
        DATA DIVISION.
        FILE SECTION.
        FD  SOURCE-FILE.
        01  SOURCE-LINE         PIC X(1024).
+       FD  CRED-FILE.
+       01  CRED-LINE           PIC X(512).
 
        WORKING-STORAGE SECTION.
        01  WS-FILENAME         PIC X(256).
        01  WS-FILE-STATUS      PIC XX.
+       01  WS-CRED-STATUS      PIC XX.
        01  WS-API-KEY          PIC X(256).
        01  WS-PUBLIC-KEY       PIC X(256).
        01  WS-SECRET-KEY       PIC X(256).
@@ -97,12 +103,23 @@
        01  WS-UOD-ENABLED      PIC X(8).
        01  WS-TYPE             PIC X(32).
        01  WS-SHELL            PIC X(32).
+       01  WS-ACCOUNT-INDEX    PIC S9(4) VALUE -1.
+       01  WS-ACCOUNT-STR      PIC X(16).
+       01  WS-ACCT-POS         PIC 9(4) VALUE 0.
+       01  WS-ERROR-MSG        PIC X(256).
 
        PROCEDURE DIVISION.
        MAIN-PROCEDURE.
-      * Get command line argument (first argument)
+      * Get first command line argument
            ACCEPT WS-ARG1 FROM COMMAND-LINE.
 
+      * Pre-scan: handle --account N global flag before subcommand
+           IF WS-ARG1 = "--account"
+               ACCEPT WS-ACCOUNT-STR FROM ARGUMENT-VALUE
+               MOVE FUNCTION NUMVAL(WS-ACCOUNT-STR) TO WS-ACCOUNT-INDEX
+               ACCEPT WS-ARG1 FROM ARGUMENT-VALUE
+           END-IF.
+
            IF WS-ARG1 = SPACES
                DISPLAY "Usage: un.cob <source_file>" UPON SYSERR
                DISPLAY "       un.cob session [options]" UPON SYSERR
@@ -147,7 +164,94 @@
            PERFORM HANDLE-EXECUTE.
            STOP RUN.
 
+       GET-CREDENTIALS.
+      * If already set, return immediately
+           IF WS-PUBLIC-KEY NOT = SPACES AND WS-SECRET-KEY NOT = SPACES
+               EXIT PARAGRAPH
+           END-IF.
+
+      * Build shell script to resolve credentials with full priority
+           IF WS-ACCOUNT-INDEX >= 0
+               MOVE WS-ACCOUNT-INDEX TO WS-ACCOUNT-STR
+               STRING "IDX=" FUNCTION TRIM(WS-ACCOUNT-STR) "; "
+                   "PK=''; SK=''; CNT=-1; "
+                   "for CSV in \"$HOME/.unsandbox/accounts.csv\" "
+                   "\"./accounts.csv\"; do "
+                   "[ -f \"$CSV\" ] || continue; "
+                   "while IFS= read -r line || [ -n \"$line\" ]; do "
+                   "case \"$line\" in \"#\"*|\"\"|\" \"*) continue ;; esac; "
+                   "CNT=$((CNT+1)); "
+                   "if [ \"$CNT\" -eq \"$IDX\" ]; then "
+                   "PK=$(echo \"$line\" | cut -d',' -f1 | tr -d ' '); "
+                   "SK=$(echo \"$line\" | cut -d',' -f2 | tr -d ' '); "
+                   "break 2; fi; "
+                   "done < \"$CSV\"; done; "
+                   "if [ -z \"$PK\" ]; then "
+                   "echo -e '\\x1b[31mError: Account index "
+                   FUNCTION TRIM(WS-ACCOUNT-STR)
+                   " not found in accounts.csv\\x1b[0m' >&2; exit 1; fi; "
+                   "printf '%s\\n%s\\n' \"$PK\" \"$SK\" "
+                   "> /tmp/unsb_creds.txt"
+                   DELIMITED BY SIZE INTO WS-CURL-CMD
+               END-STRING
+           ELSE
+               STRING "PK=\"$UNSANDBOX_PUBLIC_KEY\"; "
+                   "SK=\"$UNSANDBOX_SECRET_KEY\"; "
+                   "if [ -z \"$PK\" ]; then PK=\"$UNSANDBOX_API_KEY\"; SK=''; fi; "
+                   "if [ -z \"$PK\" ]; then "
+                   "IDX=\"${UNSANDBOX_ACCOUNT:-0}\"; "
+                   "CNT=-1; "
+                   "for CSV in \"$HOME/.unsandbox/accounts.csv\" "
+                   "\"./accounts.csv\"; do "
+                   "[ -f \"$CSV\" ] || continue; "
+                   "while IFS= read -r line || [ -n \"$line\" ]; do "
+                   "case \"$line\" in \"#\"*|\"\"|\" \"*) continue ;; esac; "
+                   "CNT=$((CNT+1)); "
+                   "if [ \"$CNT\" -eq \"$IDX\" ]; then "
+                   "PK=$(echo \"$line\" | cut -d',' -f1 | tr -d ' '); "
+                   "SK=$(echo \"$line\" | cut -d',' -f2 | tr -d ' '); "
+                   "break 2; fi; "
+                   "done < \"$CSV\"; done; fi; "
+                   "if [ -z \"$PK\" ]; then "
+                   "echo -e '\\x1b[31mError: No credentials found\\x1b[0m' "
+                   ">&2; exit 1; fi; "
+                   "printf '%s\\n%s\\n' \"$PK\" \"$SK\" "
+                   "> /tmp/unsb_creds.txt"
+                   DELIMITED BY SIZE INTO WS-CURL-CMD
+               END-STRING
+           END-IF.
+
+           CALL "SYSTEM" USING WS-CURL-CMD
+               RETURNING WS-EXIT-CODE.
+           IF WS-EXIT-CODE NOT = 0
+               MOVE WS-EXIT-CODE TO RETURN-CODE
+               STOP RUN
+           END-IF.
+
+      * Read resolved credentials from temp file
+           MOVE SPACES TO WS-PUBLIC-KEY.
+           MOVE SPACES TO WS-SECRET-KEY.
+           OPEN INPUT CRED-FILE.
+           IF WS-CRED-STATUS = "00"
+               READ CRED-FILE INTO WS-PUBLIC-KEY
+               READ CRED-FILE INTO WS-SECRET-KEY
+               CLOSE CRED-FILE
+           END-IF.
+
+           IF WS-PUBLIC-KEY = SPACES
+               DISPLAY "Error: Could not resolve credentials"
+                   UPON SYSERR
+               MOVE 1 TO RETURN-CODE
+               STOP RUN
+           END-IF.
+
        HANDLE-EXECUTE.
+      * Get credentials
+           PERFORM GET-CREDENTIALS.
+           IF WS-API-KEY = SPACES
+               MOVE WS-PUBLIC-KEY TO WS-API-KEY
+           END-IF.
+
       * Check if file exists
            OPEN INPUT SOURCE-FILE.
            IF WS-FILE-STATUS NOT = "00"
@@ -168,25 +272,14 @@
                STOP RUN
            END-IF.
 
-      * Get API key from environment
-           ACCEPT WS-API-KEY FROM ENVIRONMENT "UNSANDBOX_API_KEY".
-
-           IF WS-API-KEY = SPACES
-               DISPLAY "Error: UNSANDBOX_API_KEY not set" UPON SYSERR
-               MOVE 1 TO RETURN-CODE
-               STOP RUN
-           END-IF.
-
       * Use curl to make request
            PERFORM MAKE-EXECUTE-REQUEST.
 
        HANDLE-SESSION.
-      * Get API key
-           ACCEPT WS-API-KEY FROM ENVIRONMENT "UNSANDBOX_API_KEY".
+      * Get credentials
+           PERFORM GET-CREDENTIALS.
            IF WS-API-KEY = SPACES
-               DISPLAY "Error: UNSANDBOX_API_KEY not set" UPON SYSERR
-               MOVE 1 TO RETURN-CODE
-               STOP RUN
+               MOVE WS-PUBLIC-KEY TO WS-API-KEY
            END-IF.
 
       * Initialize session parameters
@@ -209,27 +302,8 @@
            END-IF.
 
        HANDLE-SERVICE.
-      * Get API keys (try new format first, fall back to old)
-           ACCEPT WS-PUBLIC-KEY FROM ENVIRONMENT "UNSANDBOX_PUBLIC_KEY".
-           IF WS-PUBLIC-KEY NOT = SPACES
-               ACCEPT WS-SECRET-KEY FROM ENVIRONMENT "UNSANDBOX_SECRET_KEY"
-               IF WS-SECRET-KEY = SPACES
-                   DISPLAY "Error: UNSANDBOX_SECRET_KEY not set"
-                       UPON SYSERR
-                   MOVE 1 TO RETURN-CODE
-                   STOP RUN
-               END-IF
-           ELSE
-               ACCEPT WS-API-KEY FROM ENVIRONMENT "UNSANDBOX_API_KEY"
-               IF WS-API-KEY = SPACES
-                   DISPLAY "Error: UNSANDBOX_PUBLIC_KEY/SECRET_KEY or "
-                       "UNSANDBOX_API_KEY not set" UPON SYSERR
-                   MOVE 1 TO RETURN-CODE
-                   STOP RUN
-               END-IF
-               MOVE WS-API-KEY TO WS-PUBLIC-KEY
-               MOVE WS-API-KEY TO WS-SECRET-KEY
-           END-IF.
+      * Get credentials
+           PERFORM GET-CREDENTIALS.
 
       * Initialize service parameters
            MOVE SPACES TO WS-NAME.
@@ -332,26 +406,7 @@
            END-IF.
 
        MAKE-EXECUTE-REQUEST.
-      * Get public/secret keys with fallback
-           ACCEPT WS-PUBLIC-KEY FROM ENVIRONMENT "UNSANDBOX_PUBLIC_KEY".
-           IF WS-PUBLIC-KEY NOT = SPACES
-               ACCEPT WS-SECRET-KEY FROM ENVIRONMENT "UNSANDBOX_SECRET_KEY"
-               IF WS-SECRET-KEY = SPACES
-                   DISPLAY "Error: UNSANDBOX_SECRET_KEY not set"
-                       UPON SYSERR
-                   MOVE 1 TO RETURN-CODE
-                   STOP RUN
-               END-IF
-           ELSE
-               ACCEPT WS-PUBLIC-KEY FROM ENVIRONMENT "UNSANDBOX_API_KEY"
-               IF WS-PUBLIC-KEY = SPACES
-                   DISPLAY "Error: UNSANDBOX_PUBLIC_KEY/SECRET_KEY or "
-                       "UNSANDBOX_API_KEY not set" UPON SYSERR
-                   MOVE 1 TO RETURN-CODE
-                   STOP RUN
-               END-IF
-               MOVE WS-PUBLIC-KEY TO WS-SECRET-KEY
-           END-IF.
+      * Credentials already resolved by caller (GET-CREDENTIALS)
 
       * Build curl command using shell with HMAC signature
            STRING "TS=$(date +%s); "
@@ -943,12 +998,10 @@
            CALL "SYSTEM" USING WS-CURL-CMD.
 
        HANDLE-KEY.
-      * Get API key
-           ACCEPT WS-API-KEY FROM ENVIRONMENT "UNSANDBOX_API_KEY".
+      * Get credentials
+           PERFORM GET-CREDENTIALS.
            IF WS-API-KEY = SPACES
-               DISPLAY "Error: UNSANDBOX_API_KEY not set" UPON SYSERR
-               MOVE 1 TO RETURN-CODE
-               STOP RUN
+               MOVE WS-PUBLIC-KEY TO WS-API-KEY
            END-IF.
 
       * Parse key arguments
@@ -1124,27 +1177,8 @@
            CALL "SYSTEM" USING WS-CURL-CMD.
 
        HANDLE-LANGUAGES.
-      * Get API keys
-           ACCEPT WS-PUBLIC-KEY FROM ENVIRONMENT "UNSANDBOX_PUBLIC_KEY".
-           IF WS-PUBLIC-KEY NOT = SPACES
-               ACCEPT WS-SECRET-KEY FROM ENVIRONMENT "UNSANDBOX_SECRET_KEY"
-               IF WS-SECRET-KEY = SPACES
-                   DISPLAY "Error: UNSANDBOX_SECRET_KEY not set"
-                       UPON SYSERR
-                   MOVE 1 TO RETURN-CODE
-                   STOP RUN
-               END-IF
-           ELSE
-               ACCEPT WS-API-KEY FROM ENVIRONMENT "UNSANDBOX_API_KEY"
-               IF WS-API-KEY = SPACES
-                   DISPLAY "Error: UNSANDBOX_PUBLIC_KEY/SECRET_KEY or "
-                       "UNSANDBOX_API_KEY not set" UPON SYSERR
-                   MOVE 1 TO RETURN-CODE
-                   STOP RUN
-               END-IF
-               MOVE WS-API-KEY TO WS-PUBLIC-KEY
-               MOVE WS-API-KEY TO WS-SECRET-KEY
-           END-IF.
+      * Get credentials
+           PERFORM GET-CREDENTIALS.
 
       * Parse --json flag
            MOVE SPACES TO WS-JSON-OUTPUT.
@@ -1219,27 +1253,8 @@
            CALL "SYSTEM" USING WS-CURL-CMD.
 
        HANDLE-IMAGE.
-      * Get API keys (try new format first, fall back to old)
-           ACCEPT WS-PUBLIC-KEY FROM ENVIRONMENT "UNSANDBOX_PUBLIC_KEY".
-           IF WS-PUBLIC-KEY NOT = SPACES
-               ACCEPT WS-SECRET-KEY FROM ENVIRONMENT "UNSANDBOX_SECRET_KEY"
-               IF WS-SECRET-KEY = SPACES
-                   DISPLAY "Error: UNSANDBOX_SECRET_KEY not set"
-                       UPON SYSERR
-                   MOVE 1 TO RETURN-CODE
-                   STOP RUN
-               END-IF
-           ELSE
-               ACCEPT WS-API-KEY FROM ENVIRONMENT "UNSANDBOX_API_KEY"
-               IF WS-API-KEY = SPACES
-                   DISPLAY "Error: UNSANDBOX_PUBLIC_KEY/SECRET_KEY or "
-                       "UNSANDBOX_API_KEY not set" UPON SYSERR
-                   MOVE 1 TO RETURN-CODE
-                   STOP RUN
-               END-IF
-               MOVE WS-API-KEY TO WS-PUBLIC-KEY
-               MOVE WS-API-KEY TO WS-SECRET-KEY
-           END-IF.
+      * Get credentials
+           PERFORM GET-CREDENTIALS.
 
       * Initialize image parameters
            MOVE SPACES TO WS-ID.
@@ -1676,15 +1691,7 @@
 
        HANDLE-SNAPSHOT.
       * Get credentials
-           ACCEPT WS-PUBLIC-KEY FROM ENVIRONMENT
-               "UNSANDBOX_PUBLIC_KEY".
-           ACCEPT WS-SECRET-KEY FROM ENVIRONMENT
-               "UNSANDBOX_SECRET_KEY".
-           IF WS-PUBLIC-KEY = SPACES OR WS-SECRET-KEY = SPACES
-               DISPLAY "Error: API keys not set" UPON SYSERR
-               MOVE 1 TO RETURN-CODE
-               STOP RUN
-           END-IF.
+           PERFORM GET-CREDENTIALS.
 
       * Get second argument (operation or --list)
            ACCEPT WS-ARG2 FROM ARGUMENT-VALUE.

clients/forth/sync/src/un.forth

@@ -97,8 +97,84 @@
     find-ext ext-lang
 ;
 
+\ Account index for --account N flag (-1 = not set)
+variable account-index
+-1 account-index !
+
+\ Argument shift: 0 normally, 2 when --account N is prepended
+variable arg-shift
+0 arg-shift !
+
+\ Shifted arg accessor - applies arg-shift to all handler arg accesses
+: sarg ( n -- addr len )
+    arg-shift @ + arg
+;
+
+\ Buffer for credentials loaded from CSV
+256 constant MAX-KEY-LEN
+create csv-pk-buf MAX-KEY-LEN allot
+variable csv-pk-len
+create csv-sk-buf MAX-KEY-LEN allot
+variable csv-sk-len
+
+\ Load credentials from accounts.csv at given index (n)
+\ Writes PK/SK to /tmp/unsb_creds.txt; returns true if PK found
+: load-accounts-csv-index ( n -- flag )
+    dup 0< if drop 0 exit then
+    \ Write a shell script with the index embedded
+    s" /tmp/unsb_cred_resolve.sh" w/o create-file throw >r
+    s" #!/bin/bash" r@ write-line throw
+    s" IDX=" r@ write-file throw
+    dup 0 <# #s #> r@ write-file throw
+    s" " r@ write-line throw
+    s" CNT=-1; PK=''; SK=''" r@ write-line throw
+    s" for CSV in \"$HOME/.unsandbox/accounts.csv\" \"./accounts.csv\"; do" r@ write-line throw
+    s"   [ -f \"$CSV\" ] || continue" r@ write-line throw
+    s"   while IFS= read -r line || [ -n \"$line\" ]; do" r@ write-line throw
+    s"     case \"$line\" in '#'*|'') continue ;; esac" r@ write-line throw
+    s"     CNT=$((CNT+1))" r@ write-line throw
+    s"     if [ \"$CNT\" -eq \"$IDX\" ]; then" r@ write-line throw
+    s"       PK=$(echo \"$line\" | cut -d',' -f1 | tr -d ' ')" r@ write-line throw
+    s"       SK=$(echo \"$line\" | cut -d',' -f2 | tr -d ' ')" r@ write-line throw
+    s"       break 2" r@ write-line throw
+    s"     fi" r@ write-line throw
+    s"   done < \"$CSV\"" r@ write-line throw
+    s" done" r@ write-line throw
+    s" printf '%s\\n%s\\n' \"$PK\" \"$SK\" > /tmp/unsb_creds.txt" r@ write-line throw
+    s" [ -n \"$PK\" ]" r@ write-line throw
+    r> close-file throw
+    drop  \ drop index
+    s" bash /tmp/unsb_cred_resolve.sh" system
+    0= if
+        \ Script exited 0: PK was found; read results
+        s" /tmp/unsb_creds.txt" r/o open-file
+        0= if
+            >r
+            csv-pk-buf MAX-KEY-LEN r@ read-line throw
+            drop csv-pk-len !
+            csv-sk-buf MAX-KEY-LEN r@ read-line throw
+            drop csv-sk-len !
+            r> close-file throw
+            -1
+        else
+            drop 0
+        then
+    else
+        0
+    then
+;
+
 \ Get API keys from environment (HMAC or legacy)
 : get-public-key ( -- addr len )
+    account-index @ dup 0>= if
+        load-accounts-csv-index if
+            csv-pk-buf csv-pk-len @ exit
+        then
+        s" Error: Account index not found in accounts.csv" type cr
+        1 (bye)
+    else
+        drop
+    then
     s" UNSANDBOX_PUBLIC_KEY" getenv
     dup 0= if
         2drop s" UNSANDBOX_API_KEY" getenv
@@ -110,6 +186,20 @@
 ;
 
 : get-secret-key ( -- addr len )
+    account-index @ dup 0>= if
+        \ CSV already loaded if pk-buf is non-empty
+        csv-pk-len @ 0> if
+            drop csv-sk-buf csv-sk-len @ exit
+        then
+        \ Load it now
+        load-accounts-csv-index if
+            csv-sk-buf csv-sk-len @ exit
+        then
+        \ Index not found - error was printed by get-public-key; return empty
+        s" " exit
+    else
+        drop
+    then
     s" UNSANDBOX_SECRET_KEY" getenv
     dup 0= if
         2drop s" UNSANDBOX_API_KEY" getenv
@@ -716,7 +806,7 @@
         0 (bye)
     then
 
-    2 arg 2dup s" --extend" compare 0= if
+    2 sarg 2dup s" --extend" compare 0= if
         2drop
         1 validate-key
         0 (bye)
@@ -779,7 +869,7 @@
         1 (bye)
     then
 
-    2 arg 2dup s" --list" compare 0= if
+    2 sarg 2dup s" --list" compare 0= if
         2drop session-list
         0 (bye)
     then
@@ -795,7 +885,7 @@
             s" Error: --kill requires session ID" type cr
             1 (bye)
         then
-        3 arg session-kill
+        3 sarg session-kill
         0 (bye)
     then
 
@@ -835,7 +925,7 @@
         1 (bye)
     then
 
-    2 arg 2dup s" --list" compare 0= if
+    2 sarg 2dup s" --list" compare 0= if
         2drop service-list
         0 (bye)
     then
@@ -856,7 +946,7 @@
             s" Error: --info requires service ID" type cr
             1 (bye)
         then
-        3 arg service-info
+        3 sarg service-info
         0 (bye)
     then
 
@@ -866,7 +956,7 @@
             s" Error: --logs requires service ID" type cr
             1 (bye)
         then
-        3 arg service-logs
+        3 sarg service-logs
         0 (bye)
     then
 
@@ -876,7 +966,7 @@
             s" Error: --freeze requires service ID" type cr
             1 (bye)
         then
-        3 arg service-sleep
+        3 sarg service-sleep
         0 (bye)
     then
 
@@ -886,7 +976,7 @@
             s" Error: --unfreeze requires service ID" type cr
             1 (bye)
         then
-        3 arg service-wake
+        3 sarg service-wake
         0 (bye)
     then
 
@@ -896,7 +986,7 @@
             s" Error: --destroy requires service ID" type cr
             1 (bye)
         then
-        3 arg service-destroy
+        3 sarg service-destroy
         0 (bye)
     then
 
@@ -911,13 +1001,13 @@
             s" Error: --resize requires --vcpu N" type cr
             1 (bye)
         then
-        4 arg 2dup s" --vcpu" compare 0= if
+        4 sarg 2dup s" --vcpu" compare 0= if
             2drop
             argc @ 6 < if
                 s" Error: --vcpu requires a value" type cr
                 1 (bye)
             then
-            3 arg 5 arg service-resize
+            3 sarg 5 sarg service-resize
             0 (bye)
         then
         2dup s" -v" compare 0= if
@@ -926,7 +1016,7 @@
                 s" Error: -v requires a value" type cr
                 1 (bye)
             then
-            3 arg 5 arg service-resize
+            3 sarg 5 sarg service-resize
             0 (bye)
         then
         2drop
@@ -940,16 +1030,16 @@
             s" Error: --dump-bootstrap requires service ID" type cr
             1 (bye)
         then
-        3 arg
+        3 sarg
         \ Check for --dump-file
         argc @ 5 >= if
-            4 arg 2dup s" --dump-file" compare 0= if
+            4 sarg 2dup s" --dump-file" compare 0= if
                 2drop
                 argc @ 6 < if
                     s" Error: --dump-file requires filename" type cr
                     1 (bye)
                 then
-                5 arg
+                5 sarg
             else
                 2drop 0 0
             then
@@ -967,13 +1057,13 @@
             s" Usage: un.forth service env <status|set|export|delete> <service_id> [options]" type cr
             1 (bye)
         then
-        3 arg 2dup s" status" compare 0= if
+        3 sarg 2dup s" status" compare 0= if
             2drop
             argc @ 5 < if
                 s" Error: status requires service ID" type cr
                 1 (bye)
             then
-            4 arg service-env-status
+            4 sarg service-env-status
             0 (bye)
         then
         2dup s" set" compare 0= if
@@ -991,7 +1081,7 @@
                 s" Error: export requires service ID" type cr
                 1 (bye)
             then
-            4 arg service-env-export
+            4 sarg service-env-export
             0 (bye)
         then
         2dup s" delete" compare 0= if
@@ -1000,7 +1090,7 @@
                 s" Error: delete requires service ID" type cr
                 1 (bye)
             then
-            4 arg service-env-delete
+            4 sarg service-env-delete
             0 (bye)
         then
         2drop
@@ -1072,7 +1162,7 @@
         0 (bye)
     then
 
-    2 arg 2dup s" --json" compare 0= if
+    2 sarg 2dup s" --json" compare 0= if
         2drop
         1 languages-list
         0 (bye)
@@ -1670,7 +1760,7 @@
         0 (bye)
     then
 
-    2 arg 2dup s" --list" compare 0= if
+    2 sarg 2dup s" --list" compare 0= if
         2drop snapshot-list
         0 (bye)
     then
@@ -1686,7 +1776,7 @@
             s" Error: --info requires snapshot ID" type cr
             1 (bye)
         then
-        3 arg snapshot-info
+        3 sarg snapshot-info
         0 (bye)
     then
 
@@ -1696,7 +1786,7 @@
             s" Error: --restore requires snapshot ID" type cr
             1 (bye)
         then
-        3 arg snapshot-restore
+        3 sarg snapshot-restore
         0 (bye)
     then
 
@@ -1706,7 +1796,7 @@
             s" Error: --delete requires snapshot ID" type cr
             1 (bye)
         then
-        3 arg snapshot-delete
+        3 sarg snapshot-delete
         0 (bye)
     then
 
@@ -1716,7 +1806,7 @@
             s" Error: --lock requires snapshot ID" type cr
             1 (bye)
         then
-        3 arg snapshot-lock
+        3 sarg snapshot-lock
         0 (bye)
     then
 
@@ -1726,7 +1816,7 @@
             s" Error: --unlock requires snapshot ID" type cr
             1 (bye)
         then
-        3 arg snapshot-unlock
+        3 sarg snapshot-unlock
         0 (bye)
     then
 
@@ -1736,7 +1826,7 @@
             s" Error: --clone requires snapshot ID" type cr
             1 (bye)
         then
-        3 arg snapshot-clone
+        3 sarg snapshot-clone
         0 (bye)
     then
 
@@ -1752,7 +1842,7 @@
         1 (bye)
     then
 
-    2 arg 2dup s" --list" compare 0= if
+    2 sarg 2dup s" --list" compare 0= if
         2drop image-list
         0 (bye)
     then
@@ -1768,7 +1858,7 @@
             s" Error: --info requires image ID" type cr
             1 (bye)
         then
-        3 arg image-info
+        3 sarg image-info
         0 (bye)
     then
 
@@ -1778,7 +1868,7 @@
             s" Error: --delete requires image ID" type cr
             1 (bye)
         then
-        3 arg image-delete
+        3 sarg image-delete
         0 (bye)
     then
 
@@ -1788,7 +1878,7 @@
             s" Error: --lock requires image ID" type cr
             1 (bye)
         then
-        3 arg image-lock
+        3 sarg image-lock
         0 (bye)
     then
 
@@ -1798,7 +1888,7 @@
             s" Error: --unlock requires image ID" type cr
             1 (bye)
         then
-        3 arg image-unlock
+        3 sarg image-unlock
         0 (bye)
     then
 
@@ -1818,7 +1908,7 @@
             s" Error: --visibility requires image ID and mode" type cr
             1 (bye)
         then
-        3 arg 4 arg image-visibility
+        3 sarg 4 sarg image-visibility
         0 (bye)
     then
 
@@ -1828,7 +1918,7 @@
             s" Error: --spawn requires image ID" type cr
             1 (bye)
         then
-        3 arg image-spawn
+        3 sarg image-spawn
         0 (bye)
     then
 
@@ -1838,7 +1928,7 @@
             s" Error: --clone requires image ID" type cr
             1 (bye)
         then
-        3 arg image-clone
+        3 sarg image-clone
         0 (bye)
     then
 
@@ -1860,8 +1950,21 @@
         1 (bye)
     then
 
-    \ Get first argument (skip gforth and script name)
-    1 arg
+    \ Check for --account N as first argument (before arg-shift is applied)
+    1 arg 2dup s" --account" compare 0= if
+        2drop
+        argc @ 3 < if
+            s" Error: --account requires a numeric argument" type cr
+            1 (bye)
+        then
+        2 arg s>number drop account-index !
+        2 arg-shift !
+    else
+        2drop
+    then
+
+    \ Get subcommand (adjusted for arg-shift)
+    1 arg-shift @ + arg
 
     \ Check for subcommands
     2dup s" session" compare 0= if

clients/prolog/sync/src/un.pro

@@ -39,6 +39,9 @@
 
 :- initialization(main, main).
 
+% Initialize global account index to -1 (not set)
+:- nb_setval(account_index, -1).
+
 % Constants
 portal_base('https://unsandbox.com').
 languages_cache_ttl(3600).  % 1 hour cache TTL
@@ -85,26 +88,91 @@ read_file_content(Filename, Content) :-
     read_string(Stream, _, Content),
     close(Stream).
 
-% Get API keys from environment (HMAC or legacy)
+% Load credentials from accounts.csv at 0-indexed row
+% Tries ~/.unsandbox/accounts.csv first, then ./accounts.csv
+load_accounts_csv(Index, PK, SK) :-
+    getenv('HOME', Home),
+    atomic_list_concat([Home, '/.unsandbox/accounts.csv'], Path1),
+    (   exists_file(Path1)
+    ->  load_accounts_csv_file(Path1, Index, PK, SK)
+    ;   exists_file('accounts.csv')
+    ->  load_accounts_csv_file('accounts.csv', Index, PK, SK)
+    ;   fail
+    ).
+
+load_accounts_csv_file(Path, Index, PK, SK) :-
+    setup_call_cleanup(
+        open(Path, read, Stream),
+        load_accounts_csv_stream(Stream, 0, Index, PK, SK),
+        close(Stream)
+    ).
+
+load_accounts_csv_stream(Stream, Count, Index, PK, SK) :-
+    read_line_to_string(Stream, Line),
+    Line \= end_of_file,
+    !,
+    % Skip blank lines and comments
+    (   (Line = "" ; string_code(1, Line, 35))  % 35 = '#'
+    ->  load_accounts_csv_stream(Stream, Count, Index, PK, SK)
+    ;   Count =:= Index
+    ->  split_string(Line, ",", " \t", [PKStr, SKStr|_]),
+        atom_string(PK, PKStr),
+        atom_string(SK, SKStr)
+    ;   Next is Count + 1,
+        load_accounts_csv_stream(Stream, Next, Index, PK, SK)
+    ).
+
+% Get API keys from environment (HMAC or legacy), respecting --account N
 get_public_key(PublicKey) :-
-    (   getenv('UNSANDBOX_PUBLIC_KEY', PublicKey),
-        PublicKey \= ''
-    ->  true
-    ;   getenv('UNSANDBOX_API_KEY', PublicKey),
-        PublicKey \= ''
-    ->  true
-    ;   write(user_error, 'Error: UNSANDBOX_PUBLIC_KEY or UNSANDBOX_API_KEY environment variable not set\n'),
-        halt(1)
+    (   nb_getval(account_index, Idx), Idx >= 0
+    ->  (   load_accounts_csv(Idx, PublicKey, _)
+        ->  true
+        ;   format(user_error, 'Error: Account index ~w not found in accounts.csv~n', [Idx]),
+            halt(1)
+        )
+    ;   (   getenv('UNSANDBOX_PUBLIC_KEY', PublicKey),
+            PublicKey \= ''
+        ->  true
+        ;   getenv('UNSANDBOX_API_KEY', PublicKey),
+            PublicKey \= ''
+        ->  true
+        ;   % Try accounts.csv with UNSANDBOX_ACCOUNT or row 0
+            (   getenv('UNSANDBOX_ACCOUNT', IdxStr),
+                atom_number(IdxStr, DefaultIdx)
+            ->  true
+            ;   DefaultIdx = 0
+            ),
+            (   load_accounts_csv(DefaultIdx, PublicKey, _)
+            ->  true
+            ;   write(user_error, 'Error: UNSANDBOX_PUBLIC_KEY or UNSANDBOX_API_KEY environment variable not set\n'),
+                halt(1)
+            )
+        )
     ).
 
 get_secret_key(SecretKey) :-
-    (   getenv('UNSANDBOX_SECRET_KEY', SecretKey),
-        SecretKey \= ''
-    ->  true
-    ;   getenv('UNSANDBOX_API_KEY', SecretKey),
-        SecretKey \= ''
-    ->  true
-    ;   SecretKey = ''
+    (   nb_getval(account_index, Idx), Idx >= 0
+    ->  (   load_accounts_csv(Idx, _, SecretKey)
+        ->  true
+        ;   SecretKey = ''
+        )
+    ;   (   getenv('UNSANDBOX_SECRET_KEY', SecretKey),
+            SecretKey \= ''
+        ->  true
+        ;   getenv('UNSANDBOX_API_KEY', SecretKey),
+            SecretKey \= ''
+        ->  true
+        ;   % Try accounts.csv with UNSANDBOX_ACCOUNT or row 0
+            (   getenv('UNSANDBOX_ACCOUNT', IdxStr),
+                atom_number(IdxStr, DefaultIdx)
+            ->  true
+            ;   DefaultIdx = 0
+            ),
+            (   load_accounts_csv(DefaultIdx, _, SecretKey)
+            ->  true
+            ;   SecretKey = ''
+            )
+        )
     ).
 
 % Get API key (legacy compatibility)
@@ -742,8 +810,22 @@ service_create_with_vault(Name, Ports, Bootstrap, BootstrapFile, ServiceType, In
 
 % Main program
 main(Argv) :-
+    % Initialize account_index global to -1 (not set)
+    nb_setval(account_index, -1),
+
+    % Parse --account N global flag if present
+    (   Argv = ['--account', NStr|Rest]
+    ->  (   atom_number(NStr, N), integer(N)
+        ->  nb_setval(account_index, N),
+            ActualArgv = Rest
+        ;   write(user_error, 'Error: --account requires an integer argument\n'),
+            halt(1)
+        )
+    ;   ActualArgv = Argv
+    ),
+
     % Check arguments
-    (   Argv = []
+    (   ActualArgv = []
     ->  write(user_error, 'Usage: un.pro [options] <source_file>\n'),
         write(user_error, '       un.pro session [options]\n'),
         write(user_error, '       un.pro service [options]\n'),
@@ -782,19 +864,19 @@ main(Argv) :-
     ),
 
     % Parse subcommands
-    (   Argv = ['session'|Rest]
+    (   ActualArgv = ['session'|Rest]
     ->  handle_session(Rest)
-    ;   Argv = ['service'|Rest]
+    ;   ActualArgv = ['service'|Rest]
     ->  handle_service(Rest)
-    ;   Argv = ['snapshot'|Rest]
+    ;   ActualArgv = ['snapshot'|Rest]
     ->  handle_snapshot(Rest)
-    ;   Argv = ['image'|Rest]
+    ;   ActualArgv = ['image'|Rest]
     ->  handle_image(Rest)
-    ;   Argv = ['languages'|Rest]
+    ;   ActualArgv = ['languages'|Rest]
     ->  handle_languages(Rest)
-    ;   Argv = ['key'|Rest]
+    ;   ActualArgv = ['key'|Rest]
     ->  handle_key(Rest)
-    ;   Argv = [Filename|_]
+    ;   ActualArgv = [Filename|_]
     ->  execute_file(Filename)
     ;   write(user_error, 'Error: Invalid arguments\n'),
         halt(1)