That’s not possible with a single expression in normal cron
.
The best you could do without modifying the code is:
0 0,3,6,9,12,15,18,21 * * * [cmd]
30 1,4,7,10,13,16,19,22 * * * [cmd]
These might be compressible, depending on the version of cron you have to:
0 */3 * * * [cmd]
30 1-23/3 * * * [cmd]
Two lines in the crontab. Along the lines of:
0 0,3,6,9,12,15,18,21 * * * /usr/bin/foo
30 1,4,7,10,13,16,19,22 * * * /usr/bin/foo
Is there a good reason why you can’t use 1 hour or 2 hours? It would be simpler for sure.
I haven’t tried this personally, but you can find some info here on getting cron to run every 90 minutes:http://keithdevens.com/weblog/archive/2004/May/05/cron
An excert from the above link:
0 0,3,6,9,12,15,18,21 * * * <commands> 30 1,4,7,10,13,16,19,22 * * * <commands>
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