buggrep - Bugs: bug #31736, grep chokes on filenames starting...

 
 

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bug #31736: grep chokes on filenames starting "--" (minus-minus)

Submitter:  None
Submitted:  Mon 22 Nov 2010 11:22:41 PM UTC
   
 
Category:  None Severity:  3 - Normal
Item Group:  None Status:  Invalid
Privacy:  Public Assigned to:  None
Open/Closed:  Closed

Mon 22 Nov 2010 11:47:23 PM UTC, comment #1: 

Not a bug.

Use 'grep -- --file' or 'grep -- ./--file' instead.

The behavior of -- to end option arguments is mandated by POSIX.

Additionally, when running with POSIXLY_CORRECT set in the environment, you are guaranteed that 'grep str --file' will treat --file as a filename per POSIX (since str is not an option); but when not running with POSIXLY_CORRECT, you are subject to the GNU behavior of option reordering (--file is recognized as an option even though str is not); the same approach of using 'grep -- str --file' also works to avoid this option reordering.

Eric Blake <ericb>
Group Member
Mon 22 Nov 2010 11:22:41 PM UTC, original submission:  

When grep strikes a filename starting "--" (minus-minus), it tries to interpret it as a META OPTION and fails-exits for "unknown option". Since such filenames are perfectly legal grep should instead skip and continue (at least.

Anonymous

 

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    Follow 2 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2010-11-22 ericb StatusNone Invalid
        Open/ClosedOpen Closed

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