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oy --- option encrYption
default range syntax
1,$ oy[key]
This option allows you to edit encrypted files. oy followed by a key
will cause e, r, and w, commands to encrypt and decrypt files using
crypt(1). oy will toggle the current encryption setting. If there
is no current key, se will ask you for one. If encryption is turned
on, it will be turned off. Encryption in indicated by the message
"ENCRYPT" in the status line. The key is never shown on your screen.
Type "ho" for help on the option command.
Type "hdir" to go back to the general help directory.