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Full Discussion: String comparison
Top Forums Shell Programming and Scripting String comparison Post 302942878 by Don Cragun on Saturday 2nd of May 2015 03:47:10 PM
Old 05-02-2015
Quote:
Originally Posted by mfaizan40
i tail the log and grep

Code:
FE_get_pool_threshold_congestion | percent: 0%

if % is increased by 1 e.g 1% i want to restart process the process
Quote:
i tail the log and grep

FE_get_pool_threshold_congestion | percent: 0%
tells us absolutely nothing about what is contained in the variable res in your script. We can easily state that if you effectively have done the assignment:
Code:
res="FE_get_pool_threshold_congestion | percent: 0%"

then the test:
Code:
if [ "$res" != "percent: 0%" ]
then    echo "restart some process"
fi

will ALWAYS print restart some process if you're using a shell that is based on Bourne shell syntax.

The code you supplied could behave the same as the code shown above, give a syntax error, or do various other things depending on how res was set, what shell you're using, and what operating system you're using.
 

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LEARN ABOUT LINUX

zegrep

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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