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Full Discussion: How to awk/sed/grep lines which contains a pattern at a given position
Top Forums Shell Programming and Scripting How to awk/sed/grep lines which contains a pattern at a given position Post 302252311 by anoopvraj on Wednesday 29th of October 2008 09:01:13 AM
Old 10-29-2008
How to awk/sed/grep lines which contains a pattern at a given position
Dear friends

I am new to linux and was trying to split some files userwise in our linux server.

I have a data file of 156 continuous columns named ecscr final.

I want the script to redirect all the lines containing a pattern of 7 digits to separate files. I was using grep to do that, as below. I have written all available patterns to a file named usercode.

while read alpha
do
cat ecscrfinal | grep -e $alpha >> mkoff.$alpha
echo "Generating markoff data for $alpha"
done < /home/ftp/ecs/usercode


But I need only those lines which have the pattern occuring at 3rd column or 81st column to go to that file. In the above case if the pattern is found any wher in the line, it is redirected to that file which gives me a wrong result.

How sed/awk/grep can be used to match a pattern occuring only at a specified field.....?

The pattern should be matched only if it is occuring in 3rd position or 81st postition.

Please help me.....i am running against a deadline.........
 

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LEARN ABOUT LINUX

bzegrep

BZGREP(1)						      General Commands Manual							 BZGREP(1)

NAME

       bzgrep, bzfgrep, bzegrep - search possibly bzip2 compressed files for a regular expression

SYNOPSIS

       bzgrep [ grep_options ] [ -e ] pattern filename...
       bzegrep [ egrep_options ] [ -e ] pattern filename...
       bzfgrep [ fgrep_options ] [ -e ] pattern filename...

DESCRIPTION

       Bzgrep  is  used to invoke the grep on bzip2-compressed files. All options specified are passed directly to grep.  If no file is specified,
       then the standard input is decompressed if necessary and fed to grep.  Otherwise the given files are uncompressed if necessary and  fed	to
       grep.

       If  bzgrep  is  invoked as bzegrep or bzfgrep then egrep or fgrep is used instead of grep.  If the GREP environment variable is set, bzgrep
       uses it as the grep program to be invoked. For example:

	   for sh:  GREP=fgrep	bzgrep string files
	   for csh: (setenv GREP fgrep; bzgrep string files)

AUTHOR

       Charles Levert (charles@comm.polymtl.ca). Adapted to bzip2 by Philippe Troin <phil@fifi.org> for Debian GNU/Linux.

SEE ALSO

       grep(1), egrep(1), fgrep(1), bzdiff(1), bzmore(1), bzless(1), bzip2(1)

																	 BZGREP(1)
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