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Top Forums Shell Programming and Scripting Change only first line of the match Post 302881012 by Don Cragun on Thursday 26th of December 2013 03:27:47 AM
Old 12-26-2013
I don't understand what you're trying to do. Your current script changes line 5 in your target file so that that line and possibly others will be matched by a grep. If more than one line is matched by the grep, the second sed seems to be a no-op.

If you know that line 5 is the line you want to change, why not just make the 1st sed set that line to the final result that you want on that line and skip the second set of changes to that file?
 

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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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