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Full Discussion: Grep of a SubString
Top Forums UNIX for Dummies Questions & Answers Grep of a SubString Post 302470575 by sreeharshasn on Wednesday 10th of November 2010 11:43:04 AM
Old 11-10-2010
Not an elegant Solution but a solution anyways.. I am sure there will be better ways of doing this

following is a shell script that searches for the string in a given field.
Code:
#!/bin/bash
if  [ $# -lt 3 ]
then
echo "Usage: ./empListQuery -FieldNo SearchString FileName"
else
field=$1
string=$2
file=$3
count=1
lines=`wc -l $file | cut -d ' ' -f 1`
while [ $count -le $lines ]
do
case $field in
    1)
        head -$count $file | tail -1 | cut -c 1-3 | grep  -q $string 
    if [ $? -eq 0 ]
then
     head -$count $file | tail -1
fi ;;
    2)
        head -$count $file | tail -1 | cut -c 4-8 | grep  -q $string 
    if [ $? -eq 0 ]
then
         head -$count $file | tail -1 
fi ;;
    3)
        head -$count $file | tail -1 | cut -c 9-13 | grep  -q $string 
    if [ $? -eq 0 ]
then
         head -$count $file | tail -1 
fi ;;

    4)
        head -$count $file | tail -1 | cut -c 14-18 | grep  -q $string 
    if [ $? -eq 0 ]
then
         head -$count $file | tail -1 
fi ;;

    *)
        echo "Please enter a number within 4 for firstArgument"
  esac
count=`expr $count + 1`
done
fi

Last edited by Scott; 11-10-2010 at 01:57 PM.. Reason: Please use code tags
 

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LEARN ABOUT X11R4

zgrep

ZGREP(1)                                                      General Commands Manual                                                     ZGREP(1)

NAME

       zgrep - search possibly compressed files for a regular expression

SYNOPSIS

       zgrep [ grep_options ] [ -e ] pattern filename...

DESCRIPTION

       Zgrep  invokes  grep  on  compressed  or  gzipped  files.   These  grep  options  will  cause  zgrep  to  terminate  with  an  error  code:
       (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*).  All other 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 the GREP environment variable is set, zgrep uses it as the grep program to be invoked.

EXIT CODE

       2 - An option that is not supported was specified.

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

       grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)

                                                                                                                                          ZGREP(1)
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