mail -s "You've got mail" -c email@example.com firstname.lastname@example.org email@example.com
This sends a message with the subject "You've got mail" to two recipients, firstname.lastname@example.org and email@example.com, and CCs (copies) a third, firstname.lastname@example.org. The message will be typed after the command is entered and will be ended with Control-D.
Any Unix command sequence that generates text can be used to send a message in one line. For example:
echo "Some message" | mail -s "meeting today" email@example.com
This is especially useful for having a system report its status automatically through email.
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