from - print names of those who have sent mail
from [-s sender] [-f file] [user]
from prints out the mail header lines from the invoker's
The options are as follows:
The supplied file is examined instead of the invoker's mailbox.
If the -f option is used, the user argument should
not be used.
Only mail from addresses containing the supplied
If user is given, the user's mailbox, is examined instead of
own mailbox. (Privileges are required.)
The from command appeared in 3.0BSD.
OpenBSD 3.6 December 30, 1993
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