Linux.com hears from
who lists vim, man, mc, ssh, screen, rsync and other
favorite tools. "If you need to find differences between two files,
you will want to use diff. Running diff -u file1 file2 will show you where
they differ. It can also be useful for scripting, if you want to send from
a remote system just the changes between certain files. To do this, you can
create a cron job and pipe out differences to your email.
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