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Setting "cdspell" does not return error in a non-interactive shell


From: Chris Down
Subject: Setting "cdspell" does not return error in a non-interactive shell
Date: Sun, 29 Dec 2013 02:39:07 +0800
User-agent: Mutt/1.5.22 (2013-10-16)

From "man 1 bash" on 4.2.45:

      cdspell If set, minor errors in the spelling of a directory com‐
              ponent in a cd command will be  corrected.   The  errors
              checked for are transposed characters, a missing charac‐
              ter, and one character too many.   If  a  correction  is
              found,  the corrected file name is printed, and the com‐
              mand proceeds.  This option is only used by  interactive
              shells.

Unless I am missing some reason why this is undesirable, it seems
sensible to return an error when attempting to set "cdspell" in a
non-interactive shell, in that case.

    $ bash -c 'echo $-; shopt -s cdspell; echo $?'
    hBc
    0

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