# Short answer:
$ ssh-keygen -p
# This will then prompt you to enter the keyfile location, the old passphrase,
# and the new passphrase (which can be left blank to have no passphrase).
# If you would like to do it all on one line without prompts do:
$ ssh-keygen -p [-P old_passphrase] [-N new_passphrase] [-f keyfile]
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