There's no need for a temporary file. Use shell's built-in parenthesis (also called a sub-shell). This would prevent two user's running the script at the same time and overwritting each other's results, unnecessary usage of temporary storage, and allow the shell to optimize where possible by allowing it to use a memory buffer instead of forcing it to use disk.

#!/bin/sh
(
calendar -f /usr/share/calendar/calendar.computer -l 0
calendar -f /usr/share/calendar/calendar.usholiday -l 0
calendar -f /usr/share/calendar/calendar.birthday -l 0
calendar -f /usr/share/calendar/calendar.christian -l 0
calendar -f /usr/share/calendar/calendar.freebsd -l 0
calendar -f /usr/share/calendar/calendar.history -l 0
calendar -f /usr/share/calendar/calendar.music -l 0
calendar -f ~/.calendar/calendar -l 14
) | sort -M

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This is the best solution I've seen. I appreciate the education offered by all the respondents, especially this one.

Thanks, I learned a lot, even while trying to share.

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--Chip

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