Re: input redirect from a variable

[Mikael Magnusson <mikachu@xxxxxxxxx>]

On 9/23/05, Peter Stephenson <pws@xxxxxxx> wrote:
>
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> Date: Thu, 22 Sep 2005 13:30:00 -0700
> To: Peter Stephenson <pws@xxxxxxx>
> From: Dave Yost <Dave@xxxxxxxx>
> Subject: input redirect from a variable
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>
> Hi.
>
> It seems to me that there should be a way to do something like this:
>
> foo1="$(...)"
> foo2="$(...)"
>
> comm -3 <<<<$foo1 <<<<$foo2
>
> where the <<<$foo1 syntax says to output $foo1 to a tmp file, then
> use that filenamne as the argument, then delete that file.
>
> Thanks
>
> Dave

I use this function for comparing the hexdump of two files,
hexdiff () {
	diff -u <(hexdump "$1") <(hexdump "$2")
}

so in your case, what you want to do is comm -3 <(...) <(...)
or if you really want
foo1=$(...)
foo2=$(...)
comm -3 <(echo "$foo1") <(echo "$foo2")
but that seems stupid :)
Also note this syntax will provide pipes, if you use =(...) instead
you will get temp files like you asked for.

--
Mikael Magnusson