Remove line of text from multiple files in Linux

Question

Is there a simple way to remove the same line of text from a folder full of text documents at the command line?

Answer 1

perl -ni -e 'print if not /mystring/' *

This tells perl to loop over your file (-n), edit in place (-i), and print the line if it does not match your regular expression.

Somewhat related, here's a handy way to perform a substitution over several files.

perl -pi -e 's/something/other/' *