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<pre style="font-size:14pt;font-family:courier;">
# Check every minute for logins by user “evil”“elvis”* * * * * who | grep '^evilelvis'
#
# Run a script called "ascript.bash" every odd hour (1,3 5...) during the week
0 1,3,5,7,9,11,13,15,17,19,21,23 * * 1-5 /home/bob/ascript.bash
# Run "ascript.bash" every half hour during the week
0 */2 * * 1-5 /home/bob/ascript
# Same... just doing it a different way
0 */2 * * mon,tue,wed,thu,fri /home/bob/ascript
</pre>