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The command operates on the user's mailbox if no argument is given. To send an email the message body is built from stdin. More information:

  • Send a typed email message. The command-line below continues after pressing Enter key. Input CC email-id (optional) press Enter key. Input message text (can be multiline). Press Ctrl-D key to complete the message text:

mail --subject="{{subject line}}" {{}}

  • Send an email that contains file content:

mail --subject="{{$HOSTNAME filename.txt}}" {{}} < {{path/to/filename.txt}}

  • Send a tar.gz file as an attachment:

tar cvzf - {{path/to/directory1 path/to/directory2}} | uuencode {{data.tar.gz}} | mail --subject="{{subject_line}}" {{}}