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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 MINIX

grep

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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