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Top Forums UNIX for Dummies Questions & Answers Using exit status of GREP to proceed Post 302289743 by Great Uncle Kip on Friday 20th of February 2009 10:34:23 AM
Old 02-20-2009
Using exit status of GREP to proceed

Hi

I have a script that carries out a "grep" command, and displays the output on screen.

What I need to do is utilise the exit status of this grep, so that, for example, if it returns no entries, it asks the user if they want to set up a new user, and if the grep returns an entry, it states that the user is already set up.

Any advice would be gratefully recieved.

Regards
 

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GREP(1) 						      General Commands Manual							   GREP(1)

NAME
grep - search a file for lines containing a given pattern SYNOPSIS
grep [-elnsv] pattern [file] ... OPTIONS
-e -e pattern is the same as pattern -c Print a count of lines matched -i Ignore case -l Print file names, no lines -n Print line numbers -s Status only, no printed output -v Select lines that do not match EXAMPLES
grep mouse file # Find lines in file containing mouse grep [0-9] file # Print lines containing a digit DESCRIPTION
Grep searches one or more files (by default, stdin) and selects out all the lines that match the pattern. All the regular expressions accepted by ed and mined are allowed. In addition, + can be used instead of * to mean 1 or more occurrences, ? can be used to mean 0 or 1 occurrences, and | can be used between two regular expressions to mean either one of them. Parentheses can be used for grouping. If a match is found, exit status 0 is returned. If no match is found, exit status 1 is returned. If an error is detected, exit status 2 is returned. SEE ALSO
cgrep(1), fgrep(1), sed(1), awk(9). GREP(1)
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