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Try:
echo $0

In a script it gives the name of the script and on the prompt the name of the shell.

well, to delete all mail in an inbox, without reading it you can

cat /dev/null >/var/spool/mail/<username>

so a cronjob to do that would look like

13 5 * * * cat /dev/null...

deleting mail in Unix

type mail

d * will remove all mail

d 1 3 deletes the 1st and 3rd messages
d 1-3 deletes messages 1 through 3
d * deletes all your messages
d deletes the current...