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simon_qwl

10-27-2005 04:35 AM

shell script: File Manipulation

hi,everyone!i want write a shell script which can delete certain line in a file based on the user's selection.
user will give the string pattern in command line and the shell script will delete any matched lines in a file.i tried to use 'sed' to achieve this,however sed command considers the '$1' is a string pattern rather than a varaible. it will search the file with string pattern '$1'.
thanks a lot for any helps!

homey

10-27-2005 05:10 AM

Hi,
Something like this ...

Code:

#!/bin/bash



echo

echo ""

echo "Enter string: "

read info

echo



file="/home/file.txt"

stuff=`cat $file | grep -n "$info" | cut -d: -f1`

cat $file | sed -e ''$stuff'd'

eddiebaby1023

10-29-2005 03:40 PM

Quote:

Code:

stuff=`cat $file | grep -n "$info" | cut -d: -f1`

cat $file | sed -e ''$stuff'd'

Please don't be a process hog (and your quoting leaves a bit to be desired ;-) ):

Code:

stuff=`grep -n "$info" $file | cut -d: -f1`

sed -e "/$stuff/d" $file

Simon, if you use double quotes around the $1, you'll find sed will work perfectly.

Code:

sed "/$1/d" file

Learn how to use quotes properly and you'll find scripting becomes much easier.

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