ap - Parses addresses RFC 822-style
/usr/lib/mh/ap [ -form file ] [ -format string ] [ -help ] [ -[no]normalize ] [ -width columns ] addrs ...
Overrides the default output format of ap. The output is formatted according to the instructions in the specified file. This must be a format file; see mh-format(4). Overrides the default output format of ap. The output is formatted according to the instructions in the specified string. This must be a format string; see mh-format(4).
The ap program parses addresses according to the ARPA Internet standard. It also understands many nonstandard formats. It is useful for seeing how MH will interpret an address.
The ap program treats each argument as one or more addresses, and prints those addresses in the official RFC 822 format. Hence, it is usually best to enclose each argument in double quotes (") for the shell.
In addition to the standard escapes, ap also recognizes the additional escape error, which is a diagnostic that is returned if the parsing operation failed.
The default settings for the ap command are -normalize and -width columns, where columns is equal to the the width of the terminal.
On systems where MH is configured with the BERK option, address parsing is not enabled.
This is the default format string used by ap:
If an error was detected, the preceding string instructs ap to print the error, a colon (:), and the address that is in error. Otherwise, the ap command output is the proper RFC 822 format of the address.
System customization file.
Standard for the Format of ARPA Internet Text Messages (RFC 822) delim off