Sed replace

[kaarthikeyapreyan]

I run this script in the bash environment GNU bash, version 3.00.15(1)-release (x86_64-redhat-linux-gnu) and sed GNU sed version 4.1.2, which has this line

sed -i 's/$pattern/$desired/g' $file

this does the desired replace in the command line but not when run in a script.
what possibly could be the reason.?

[kaarthikeyapreyan]

The other option that i tried was

 cat $file | sed -e 's/$pattern/$desired/g' >$file

but this actually resulted in the desired file being empty.?

[ashitpro]

Could you please modify the script and print the $file just before the sed command?

Just check out if it is getting initialized to a desired file name.
Else, post the error or script.