/usr.bin/mail/misc/mail.tildehelp

 1-----------------------------------------------------------
 2The following ~ escapes are defined:
 3~?		Print this message
 4~~		Quote a single tilde
 5~.		Simulate end-of-file on input
 6~A		Equivalent to: ~i Sign
 7~a		Equivalent to: ~i sign
 8~b users	Add users to Bcc list
 9~c users	Add users to Cc list
10~C		Dump core
11~d		Read in dead.letter
12~e		Edit the message buffer
13~f messages	Read in messages
14~F messages	Same as ~f, but keep all header lines
15~h		Prompt for Subject and To, Cc, and Bcc lists
16~i name		Insert the value of the named variable
17~m messages	Read in messages, right shifted by a tab
18~M messages	Same as ~m, but keep all header lines
19~p		Print the message buffer
20~q		Quit, save partial message in dead.letter
21~r file		Read a file into the message buffer
22~r !command	Insert the output of the command
23~< file		Same as ~r
24~< !command	Same as ~r
25~R address	Set Reply-to to address
26~s subject	Set Subject to subject
27~t users	Add users to the To list
28~v		Invoke display editor on message
29~w file		Write message onto file
30~x		Quit, do not save to dead.letter
31~! command	Invoke the shell
32~| command	Pipe the message through the command
33~^ command	Same as ~|
34~_ mail-cmd	Perform the command-level request
35~: mail-cmd	Same as ~_
36-----------------------------------------------------------