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Top Forums UNIX for Dummies Questions & Answers Capturing a non-result of a command Post 302319812 by figaro on Tuesday 26th of May 2009 08:54:44 AM
Old 05-26-2009
Thank you for your response. Yes, in some cases the following occurs:
Code:
# kldstat | grep linux
#

This is FreeBSD 7.1 by the way, whereby Linux emulation needs to be enabled. So your suggestion means I need to evaluate $? or use trap somehow? Please advise.
 

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ZGREP(1)						      General Commands Manual							  ZGREP(1)

NAME
zgrep - search possibly compressed files for a regular expression SYNOPSIS
zgrep [ grep_options ] [ -e ] pattern filename... DESCRIPTION
Zgrep invokes grep on compressed or gzipped files. These grep options will cause zgrep to terminate with an error code: (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*). All other options specified are passed directly to grep. If no file is specified, then the standard input is decompressed if necessary and fed to grep. Otherwise the given files are uncompressed if necessary and fed to grep. If the GREP environment variable is set, zgrep uses it as the grep program to be invoked. EXIT CODE
2 - An option that is not supported was specified. AUTHOR
Charles Levert (charles@comm.polymtl.ca) SEE ALSO
grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1) ZGREP(1)
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