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Top Forums Shell Programming and Scripting [Solved] Changing 0 to 1 and 1 to 0 Post 302695229 by Jotne on Sunday 2nd of September 2012 06:12:53 AM
Old 09-02-2012
[Solved] Changing 0 to 1 and 1 to 0

Hi

I have an expression that returns 1 if a text is found and 0 if its not found.
I need it the other way around. 0 of found and 1 if its not found

Code:
echo $((`cat /var/log/system1/output.html | grep aligment | head -n1 | wc -l`))

Is this possible without doing an if/then/else, just with math (bolean) in same line?

Edit
"grep -q" worked great

Last edited by Jotne; 09-02-2012 at 09:06 AM..
 

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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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