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Re: docs incorrectly mention pattern matching works like pathname expans


From: Stormy
Subject: Re: docs incorrectly mention pattern matching works like pathname expansion
Date: Thu, 15 Mar 2018 16:15:50 +0000 (UTC)

Thanks for the reply.  I'm not sure we are talking about the same thing.. 
maybe..does this example help?
# case /test/test2/dir1/file in  /test/*) echo 'match';; *) echo 'nomatch';; 
esac
match

here, the expectation is to NOT match, since '/test/*' in normal shell, i.e. 
"ls", would NOT match that long path.  by path name expansion, man page is 
hinting it behaves like "ls", but clearly it does not.
in summary, it seems bash has no internal fnmatch(3) implementation.
 

    On Thursday, March 15, 2018, 5:26:32 PM GMT+2, Chet Ramey <address@hidden> 
wrote:  
 
 On 3/14/18 1:43 PM, Stormy wrote:

> Bash Version: 4.2
> Patch Level: 46
> Release Status: release
> 
> Description:
>  Section of 'case' in bash's man page says:
> 
>  case word in [ [(] pattern [ | pattern ] ... ) list ;; ] ... esac
>               A  case  command  first expands word, and tries to match it 
> against each pattern in turn, using the same matching
>               rules as for pathname expansion (see Pathname Expansion below).
> 
> but that is not correct, the matching here does NOT follow pathname 
> expansion, the treatment of "/" is not the same.

The description of Pathname Expansion says, in part:

"When matching a
pathname, the slash character must always be matched explicitly."

but I can expand that to also say that it other contexts it does not need
to be.


-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
        ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    address@hidden   http://tiswww.cwru.edu/~chet/
  

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