$MAIL  –  Path to a mail file or directory

$MAIL contains the path to a file or a Maildir-format directory. If $MAILPATH is not set, then Bash informs the user when new mail arrived in $MAIL.

Links

• Bash manual

Examples

Check $HOME/.inbox for incoming mail every 10 seconds

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MAIL=~/".inbox" MAILCHECK=10 # Now bash will notify you when ~/.inbox changes