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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