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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 DEBIAN

dwww-refresh-cache

DWWW-REFRESH-CACHE(8)						      Debian						     DWWW-REFRESH-CACHE(8)

NAME

       dwww-refresh-cache - rebuilds dwww cache directory

SYNOPSIS

       dwww-refresh-cache

DESCRIPTION

       dwww-refresh-cache  is  a  simple  shell  script,  which  deletes  outdated  cache  files and rebuilds contents of the dwww cache directory
       /var/cache/dwww.  In default installation, the script is called from /etc/cron.daily/dwww, so the cache is refreshed every day.

CONFIGURATION VARIABLES

       DWWW_KEEPDAYS
	      Specifies, how many days documents that have not been accessed should be kept in the cache.  Default is 10 days.

       DWWW_QUICKFIND_DB
	      Location	of  the  installed  packages  and  programs  cache  file,  generated  with  help   of	dwww-quickfind(8).    Default	is
	      /var/cache/dwww/quickfind.dat.

       DWWW_DOCBASE2PKG_DB
	      Location	of  the  cache	file,  which  maps installed doc-base files to packages names, used by the dwww-build-menu(8).	Default is
	      /var/cache/dwww/docbase2pkg.dat.

FILES

       /etc/dwww/dwww.conf
	      Configuration file for dwww(7).

       /var/cache/dwww
	      dwww cache directory.

       /etc/cron.daily/dwww.
	      dwww daily cron job

SEE ALSO

       dwww(7), dwww-build-menu(8), dwww-cache(8), dwww-find(8).

AUTHOR

       Robert Luberda.
       See dwww(7), for copyrights and stuff.

dwww 1.11.1							February 15th, 2009					     DWWW-REFRESH-CACHE(8)