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Full Discussion: Grep and cat combined
Top Forums UNIX for Dummies Questions & Answers Grep and cat combined Post 302783177 by biopsy on Wednesday 20th of March 2013 05:46:11 AM
Old 03-20-2013
Grep and cat combined

Hello,
i need to search one word (snp1) from many files and copy the content of the columns of this word in new file.
example:
file 1:
Code:
SNP   BP   CHR  P
snp1  1     3     0.01
snp2  2     2     0.05
.
.

file 2:
Code:
SNP   BP   CHR  P
snp1  1     3     0.06
snp2  2     2     0.3

output file:
Code:
SNP   BP   CHR  P     P
snp1  1     3     0.01 0.06

I tried this code
Code:
ls  -t *.txt > FileList.tmp  # make a file list of all files

Code:
cat FileList.tmp | while read line
do grep snp1| awk '{ print $1 $2 }' >temp.txt 
done

is this correct?
thank you

Last edited by radoulov; 03-20-2013 at 07:05 AM.. Reason: Code tags.
 

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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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