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Top Forums Shell Programming and Scripting sed behaving oddly, repeats lines Post 302667841 by alister on Saturday 7th of July 2012 02:37:53 PM
Old 07-07-2012
Because sed prints every line by default anyway, unless you use -n or unless you delete the line. The p command in that sed script also prints it. So, that script will print lines that match twice and lines that don't match once.

You can either use -n option or you can invert the logic:
Code:
sed '/how/,/today/!d'

Note the !. That deletes every line that does not match.

Regards,
Alister
 

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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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