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Top Forums UNIX for Dummies Questions & Answers Match pattern in a field, print pattern only instead of the entire field Post 302603528 by lucasvs on Thursday 1st of March 2012 08:50:35 AM
Old 03-01-2012
Match pattern in a field, print pattern only instead of the entire field

Hi !

I have a tab-delimited file, file.tab:
Code:
Column1             Column2                              Column3
aaaaaaaaaa          bbtomatoesbbbbbb          cccccccccc
ddddddddd          eeeeappleseeeeeeeee        ffffffffffffff
ggggggggg          hhhhhhtomatoeshhh        iiiiiiiiiiiiiiii


I would need to:
1) Search, only in field $2, the pattern "tomatoes" among the string of letters (I wrote it in bold just for the example)
2) Print the lines with the pattern "tomatoes" in field $2, but only with the pattern printed in $2 instead of the entire string.

In order to obtain output.tab:
Code:
Column1             Column2        Column3
aaaaaaaaaa          tomatoes        cccccccccc
ggggggggg          tomatoes        iiiiiiiiiiiiiiii

I hope my query is clear enough...Smilie
or at least tell me if it is doable !!!!
 

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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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