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How to change a substitution value in a file?

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# 1  
Old 05-15-2010
How to change a substitution value in a file?
Hi, i want to change a subs. value in a file, with using a script..

this is my script... (example)

Code:
#!/bin/bash

NDIR=`zenity --file-selection --directory`

mv  $HOME/Desktop/myfile  /tmp/myfile.temp

XT='"'

perl -pe "s/.*/DIR=$XT`echo -e "$NDIR"`$XT/ if $. == 40"  < /tmp/myfile.temp > /tmp/myfile


mv /tmp/myfile  $HOME/Desktop

This script will change line 40 in 'myfile' file when i run it.

This is the origin value (line 40)

Code:
DIR="/home/user/Documents"

alternative solutions is welcome


Sorry, maybe this topic exists in forum but i couldn't find..

Tx..
# 2  
Old 05-15-2010
MySQL
Code:
DIR="/home/user/Documents"
NDIR="/newpath/newwpath"
fortiethline=$( (sed = file | sed -e '{N;}' -e 's/\n//' | sed -n '/^40/ {p;q}' | sed 's/^[0-9]*//') )

[ "$fortiethline" == "$DIR" ] && sed -i "40c$NDIR" file || echo "40 line is not equal $DIR"

# 3  
Old 05-15-2010
@ygemici, thanks for your help..

i used only this command for my script.

Code:
sed -i "40c$NDIR" file

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