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<TITLE>Re: [CentOS] backups and md5 all in one while splitting</TITLE>
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<P><FONT SIZE=2>Well in bash/sh the () means execute in a sub-shell. If you redirect or pipe output from one process to a command in a sub-shell it will be redirected or piped (whatever the original was) to the command being executed in the sub-shell.<BR>
<BR>
You can also use $(command) as a command-line variable that will substitute the output of the command during evaluation.<BR>
<BR>
Ie<BR>
# mkinitrd /boot/initrd-$(uname -r).img $(uname -r)<BR>
<BR>
-Ross<BR>
<BR>
<BR>
-----Original Message-----<BR>
From: centos-bounces@centos.org <centos-bounces@centos.org><BR>
To: CentOS mailing list <centos@centos.org><BR>
Sent: Mon Nov 12 17:57:11 2007<BR>
Subject: Re: [CentOS] backups and md5 all in one while splitting<BR>
<BR>
Ross S. W. Walker wrote:<BR>
><BR>
> 'tee' splits the stdin into multiple output streams.<BR>
><BR>
> The first instance of tee you listed gave it a file name and a pipe to<BR>
> output the stdout to.<BR>
><BR>
> The second instance did a redirection to a sub-shell which then passed<BR>
> it to 'split' and it also had a pipe.<BR>
><BR>
> -Ross<BR>
><BR>
<BR>
How does this sub-shell redirection work? Can someone explain the<BR>
syntax to me or shoot me a link to a doc somewhere?<BR>
<BR>
Russ<BR>
<BR>
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