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how to catch the exit status

Comment:

Hi, in a script, how to catch an exit status of a command, say egrep? if i wanna know if this command egrep "/foo/" foo.log match any "foo" string in the file foo.log then what should i do to catch the exit status 0 of egrep ?

Reply:

Firstly, I assume you don't want to see the output from the grep? So you want to add the following to the end... >/dev/null -- sends output to nowhere 2>&1 -- sends error messages to same as output. Then you can use the shell variable $? to find the return code.... ie. #!/bin/ksh grep -i error errlog.txt >/dev/null 2>&1 if [ $? -eq 0 ] then echo "ALL QUIET ON THE WESTERN FRONT" else echo "SMOKE ON THE HORIZON!" fi Best Wishes, Sean

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Timer in a shell script

print a file line-by-line

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