Perl: Loop through a file and substitute

Question

I simply wanna read in a logfile, do a search and replace, and then write out the changes to that same logfile.

What\'s the best practice way of doing this in Perl?

Answer 1

This is often done with a one-liner:

perl -pi.bak -e "s/find/replace/g" <file>

Note the -i.bak portion -- this creates a backup file with the extension .bak. If you want to play without a net you can do this to overwrite the existing file without a backup:

perl -pi -e "s/find/replace/g" <file>

Answer 2

I normally code up a one liner for this:

perl -i -pe 's/some/thing/' log.file

See Here

Answer 3

or you can use sed (I know... you asked about perl):

sed -i 's/find/replace/g' <file>