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Re: unalias from within a subshell does not work?


From: Chet Ramey
Subject: Re: unalias from within a subshell does not work?
Date: Mon, 17 Dec 2001 09:03:37 -0500

> Machine Type: i686-pc-linux-gnu
> 
> Bash Version: 2.05a
> Patch Level: 0
> Release Status: release
> 
> Description:
>       I set 'alias  make="make  -j2"'  Then within a subshell ()
> I 'unalias  make', yet when make is called from within that subshell
> it is still aliased.  While I do not expect the unalias to exetend
> outside the subshell, I did expect it to work within the subshell.
> Is this a bug?

No.  You need to read the manual page, where it explains that aliases
are expanded when a compound command is read, not when it is executed.
By the time the `unalias' command is executed, alias expansion has
already taken place.

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
( ``Discere est Dolere'' -- chet)

Chet Ramey, CWRU    address@hidden    http://cnswww.cns.cwru.edu/~chet/



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