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Run script no more than twice daily WITHOUT cron

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Top Forums Shell Programming and Scripting Run script no more than twice daily WITHOUT cron
# 8  
Old 08-13-2018
You can do this, but be careful that you don't run into a race condition, if the script is started twice at nearly the same time. Also, if someone deletes or manipulates your "control file", this protection is lost.

Other possibilities are to use the
Code:
at

command, or use a master script, which starts your script exactly twice. Of course in this case you have to ensure that the master script itself is not run twice.
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LEARN ABOUT LINUX

atd

ATD(8)							      System Manager's Manual							    ATD(8)

NAME

       atd - run jobs queued for later execution

SYNOPSIS

       atd [-l load_avg] [-b batch_interval] [-d] [-f] [-s]

DESCRIPTION

       atd runs jobs queued by at(1).

OPTIONS

       -l      Specifies  a  limiting load factor, over which batch jobs should not be run, instead of the compile-time choice of 1.5.	For an SMP
	       system with n CPUs, you will probably want to set this higher than n-1.

       -b      Specify the minimum interval in seconds between the start of two batch jobs (60 default).

       -d      Debug; print error messages to standard error instead of using syslog(3).  This option also implies -f.

       -f      Run atd in the foreground.

       -s      Process the at/batch queue only once.  This is primarily of use for compatibility with old versions of at; atd -s is equivalent	to
	       the old atrun command.  A script invoking atd -s is installed as /usr/sbin/atrun for backward compatibility.

WARNING

       atd won't work if its spool directory is mounted via NFS even if no_root_squash is set.

FILES

       /var/spool/cron/atjobs The directory for storing jobs; this should be mode 700, owner daemon.

       /var/spool/cron/atspool The directory for storing output; this should be mode 700, owner daemon.

       /etc/at.allow, /etc/at.deny determine who can use the at system.

SEE ALSO

       at(1), atrun(1), cron(8), crontab(1), syslog(3), at.deny(5), at.allow(5).

BUGS

       The functionality of atd should be merged into cron(8).

								    2009-11-14								    ATD(8)