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Full Discussion: sed performance
Top Forums UNIX for Advanced & Expert Users sed performance Post 302174503 by ghostdog74 on Tuesday 11th of March 2008 09:40:36 AM
Old 03-11-2008
take note, that your sed syntax with -i makes an inplace edit, while grep doesn't replace the file. you can consider that part of the reason why you said its slow.
if you roughly know where the pattern near the end is, you can give address ranges
Code:
eg
sed -i '2000,$ s/old/new/' 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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