Try using grep -q, it is much easier than redirecting
On Nov 1, 2010, at 3:07 PM, JIM AMANATIDIS, BLOOMBERG/ 731 LEXIN wrote:
>
> Okay, this seems to break with the string being searched is wrapped in
> quotes, regardless of how many "\" surround it to escape it:
>
> classes:
> "Has_ce_nic" expression => returnszero("/bin/grep \\\"ce\\\"
> /etc/path_to_inst >/dev/null 2>&1", "useshell");
>
> Note, if I use "noshell" and remove the /dev/null stuff, the expression
> works. But that defeats the original point of trying to make this quiet.
>
> Thanks, Jim
>
>
>
> ----- Original Message -----
> From: no-re...@cfengine.com
> To: help-cfengine@cfengine.org
> At: 10/26 19:02:46
>
> Forum: Cfengine Help
> Subject: Re: how to redirect to /dev/null
> Author: joke
> Link to topic: https://cfengine.com/forum/read.php?3,18892,18897#msg-18897
>
> I think you should just enable the shell and do shell redirecting.
>
> classes:
> "Is_SOL10_U1" expression => returnszero("/bin/grep s10s_u1wos /etc/release
> >/dev/null 2>&1", "useshell");
>
> Enabling the shell causes overhead though.
>
> Unfortunately cfengine prohibits using "exec /bin/grep ..." as command. This
> would prevent forking a process and save some resources but cfengine requires
> the input pattern to begin with a "/".
>
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