1. This sequence can be used at a terminal:
at -m 0730 tomorrow
sort < file >outfile
EOT
2. This sequence, which demonstrates redirecting standard error
to a pipe, is useful in a command procedure (the sequence of
output redirection specifications is significant):
at now + 1 hour <<!
diff file1 file2 2>&1 >outfile | mailx mygroup
!
3. To have a job reschedule itself, at can be invoked from
within the at-job. For example, this daily processing script
named my.daily runs every day (although crontab is a more
appropriate vehicle for such work):
# my.daily runs every day
daily processing
at now tomorrow < my.daily
4. The spacing of the three portions of the POSIX locale
timespec is quite flexible as long as there are no
ambiguities. Examples of various times and operand
presentation include:
at 0815am Jan 24
at 8 :15amjan24
at now "+ 1day"
at 5 pm FRIday
at '17
utc+
30minutes'
