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speaking of true --help, did you know that GNU true can exit non-zero? the exact way is left as an exercise to the reader :) (if you're actually trying it at h
by Hello71 8y ago
speaking of true --help, did you know that GNU true can exit non-zero? the exact way is left as an exercise to the reader :)
(if you're actually trying it at home, remember that "true" is virtually always a builtin. AFAIK there is no legitimate way to have shell builtin true return non-zero. (overwriting the command doesn't count :P))
- jolmg 8y agoHuh. The reply link appeared. Anyway, yeah, there's a commented line mentioning that: /* Note true(1) will return EXIT_FAILURE in the edge case where writes fail with GNU specific options. */ atexit (close_stdout); Makes sense. If you: $ /bin/true --version >& - it fails because it was not able to write what you asked it to stdout.
- josefx 8y agoBy specification it should not print anything or fail in any way http://pubs.opengroup.org/onlinepubs/9699919799/utilities/true.html http://pubs.opengroup.org/onlinepubs/9699919799/utilities/tr... .