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Date: Fri, 02 Aug 2002 16:31:13 -0700
To: "Barnhart, Kevin" <Kevin DOT Barnhart AT echostar DOT com>,
   "'cygwin AT cygwin DOT com'" <cygwin AT cygwin DOT com>
From: Randall R Schulz <rrschulz AT cris DOT com>
Subject: Re: Easy, quick, BASH question
In-Reply-To: <C69F6A9E1E1F5A488C58B168F0875F4006B80CAB@riv-exch1.echosta
 r.com>
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Kevin,

In BASH aliases are much more limited than they are in CSH/TCSH. BASH 
aliases can only perform a left-hand substitution for the aliased command. 
It can be a multi-word substitution, but the alias is a completely 
unparameterized substitution and the substitution remains strictly at the 
left of the resulting command with any arguments passed to the alias added 
on the right / after those appearing in the alias definition.

To get anything more complicated, you must use a shell procedure. E.g.:

hcgrep() {
         grep -n "$@" $(find -name '*.[ch]')
}

Note that you want to use "$@" not "$*" since the former yields each 
argument individually quoted whereas the second produces a single argument 
to grep consisting of each argument to chgrep concatenated with a single 
space interpolated between each.

Randall Schulz
Mountain View, CA USA


At 15:04 2002-08-02, Barnhart, Kevin wrote:
>I'm trying to setup an alias for grep that recursively looks through all .c
>and .h files for a string.  So far I've tried variations of:
>
>alias hcgrep='grep -n "$*" $(find . -name '*.[ch]')'
>
>There's probably just one little thing I'm missing...
>
>Thanks,
>Kevin


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