from

Show mail senders

$ from

$ from [username]

$ from -s

$ from -c

$ from -f [/var/mail/user]

from [options] [user]

from displays the mail header summary showing who mail is from. It reads the system mailbox and shows sender information for each message.
The tool provides a quick overview of pending mail without opening a mail client. With -s, it shows subjects for quick scanning of message content.
from is useful for checking mail status in shell scripts or quick terminal checks.

USER

Username to check mail for.

Show Subject line with sender.

Print count of messages only.

Mailbox file to read.

Don't check for new mail.

Display help information.

Only works with mbox format mailboxes. May not work with modern mail systems. Limited to local mail.

from is a classic BSD utility for checking local mail. It predates modern mail systems and works with traditional Unix mbox files.

mail(1), biff(1), mailx(1)