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# 1  
Tools Cronjob

How to set cronjob for 48 hours.

I can set for 2 days as shown below.
* * */2 * *

It is creating confusion for 30 days & 31 days per month.
# 2  
Set it to daily, and let the cron job skip every second time.
59 23 * * *  tf=/tmp/tf; if [ -d $tf ]; then rmdir $tf; /path/to/realcronjob; else mkdir $tf; fi

As root the protected /var/run/ is safer than /tmp/.
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# 3  
this below cron will work.

0 0 2-31/2 * * command2
# 4  
Originally Posted by shajay12
this below cron will work.

0 0 2-31/2 * * command2
When the calendar days are 28,29,30,31,1,2,3,4 it will run the red days, and you see that the "every second day" rule is violated.

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