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Top Forums UNIX for Beginners Questions & Answers Schedule the cron job for every 21day on saturday Post 303017031 by MadeInGermany on Tuesday 8th of May 2018 08:50:38 AM
Old 05-08-2018
Code:
0 6 * * 6 lr=./lastrun; [ "`find $lr -mtime -21`" ] || { touch $lr; /path/to/real/job; }

Assuming that . (the home directory) is writable.
The find will report the file if less than 21 days old, then nothing is done.
Otherwise the file is refreshed and the job is done.
 

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ATRUN(8)						    BSD System Manager's Manual 						  ATRUN(8)

NAME
atrun -- run jobs queued for later execution SYNOPSIS
atrun [-l load_avg] [-d] DESCRIPTION
atrun runs jobs queued by at(1). Root's crontab(5) must contain the line: */10 * * * * root /usr/libexec/atrun so that atrun(8) gets called every ten minutes. At every invocation, every job in lowercase queues whose starting time has passed is started. A maximum of one batch job (denoted by upper- case queues) is started each time atrun is invoked. OPTIONS
-l load_avg Specifies a limiting load factor, over which batch jobs should not be run, instead of the compiled-in value of 1.5. -d Debug; print error messages to standard error instead of using syslog(3). WARNINGS
For atrun to work, you have to start up a cron(8) daemon. FILES
/var/at/spool Directory containing output spool files /var/at/jobs Directory containing job files SEE ALSO
at(1), crontab(1), syslog(3), crontab(5), cron(8) AUTHORS
Thomas Koenig <ig25@rz.uni-karlsruhe.de> BUGS
The functionality of atrun should be merged into cron(8). BSD
April 12, 1995 BSD
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