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Add SHELL_ERROR and SHELL_EXIT_CODE magic variables to psql.

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These are set after a \! command or a backtick substitution.
SHELL_ERROR is just "true" for error (nonzero exit status) or "false"
for success, while SHELL_EXIT_CODE records the actual exit status
following standard shell/system(3) conventions.

Corey Huinker, reviewed by Maxim Orlov and myself

Discussion: https://postgr.es/m/CADkLM=cWao2x2f+UDw15W1JkVFr_bsxfstw=NGea7r9m4j-7rQ@mail.gmail.com
This commit is contained in:
Tom Lane
2023-03-21 13:03:42 -04:00
parent 0f85db92b9
commit b0d8f2d983
6 changed files with 88 additions and 3 deletions
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4
src/bin/psql/help.c
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@@ -451,6 +451,10 @@ helpVariables(unsigned short int pager)
HELP0(" SERVER_VERSION_NAME\n"
" SERVER_VERSION_NUM\n"
" server's version (in short string or numeric format)\n");
HELP0(" SHELL_ERROR\n"
" true if the last shell command failed, false if it succeeded\n");
HELP0(" SHELL_EXIT_CODE\n"
" exit status of the last shell command\n");
HELP0(" SHOW_ALL_RESULTS\n"
" show all results of a combined query (\\;) instead of only the last\n");
HELP0(" SHOW_CONTEXT\n"