Mailing Non-interactively: mhmail
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The Section Sending Files; Using mhmail and viamail
had an introduction to mhmail.
This section shows some examples of its uses in programming.
For instance, to mail a temporary file named $temp to the user who
is running your Bourne shell script ($USER), your script could
execute:
mhmail $USER -subject "XXX XXX" < $temp
Be sure to use a left angle bracket (<), not a right angle
bracket (>).
If the standard input (here, the file $temp) is empty, mhmail
won't send a message.
The workaround is to test the file size before running mhmail.
If the file is empty, the echo command outputs a newline -- which is
enough to make mhmail happy:
if test -s "$temp"
then mhmail $USER -subject "XXX XXX" < $temp
else echo | mhmail $USER -subject "XXX XXX"
fi
One more "gotcha": without command-line arguments, mhmail runs
inc.
mhmail was designed to be similar to the standard UNIX mail command.
(With no addresses, mail gets your new mail.)
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