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Date: Tue, 29 Aug 2006 17:35:24 -0400
From: Tristen Hayfield <tristen DOT hayfield AT gmail DOT com>
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Subject: Re: Problem when using variable assignment, backticks in shell script
References: <017630AA6DF2DF4EBC1DD4454F8EE29708D75075 AT rsana-ex-hq1 DOT NA DOT RSA DOT NET> <44F4AEB3 DOT 7769D22D AT dessent DOT net>
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One may also do:
read x < temp
in bash

Tristen

Brian Dessent wrote:
> "Silva, Russell" wrote:
> 
>>   x=`/usr/bin/cat < temp`;
> 
> I don't know what is causing your problem.  I ran your testcase several
> times and never saw a failure, but from your description it seems like
> it's the kind of thing that might occur very rarely.
> 
> My only suggestion is that if your true desire is to actually read the
> contents of a file into a variable, then the above construct is a fairly
> expensive way of doing it.  This requires a fork/exec (an operation
> which is extremely slow under cygwin) of /bin/cat, whose purpose is only
> to read from one fd and write to another.  If you can live with a
> bash-specific (?) construct, then x=$(< temp) should cause the same
> effect but much more efficiently, as the shell itself just reads the
> file without invoking any subprocesses.
> 
> Brian
> 
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