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Full Discussion: Schedule and Run By weekly shell script in cronjob
Top Forums Shell Programming and Scripting Schedule and Run By weekly shell script in cronjob Post 302776977 by rbatte1 on Thursday 7th of March 2013 07:51:42 AM
Old 03-07-2013
Depending on the OS you are using, you may have a cron setup that works for every two weeks, but by using the date command in your script you could schedule it weekly and they choose whether to actually execute or not.

On many flavours of unix, you may find that
Code:
date +%j

gives the Julian date. Given that there are seven days in a week, you could schedule every Monday and then have a test for "Is today an even Julian date?" test at the top.

Some other flavours will give the week of the year, and it's a similar thing, but probably using Julian date is the best.

So an entry for cron:-
Code:
$ crontab -e
0 4 * * 1 /home/myuser/myscript

will run this every Monday at 4am. You could then code your script like this:-
Code:
#!/bin/ksh

juldate=`date +%j`
((jultest=$juldate/2))
((jultest=$juldate*2))

if [ $juldate -ne $jultest ]
then
   print "This is an odd week of the year."
   print "No actions performed."
   exit
fi

# I have confirmed it is an even numbered Monday, so proceed

blah blah blah.......

Of course, you could make the test -eq to say you want to ignore even numbered Mondays. The divide by two, multiply by two relys on odd numbers division getting the 0.5 truncated, so if the Julian date is 123, the half is only counted as 61, so double it again and you get 122. Test then finds that they are different.


Does this help?



Robin
Liverpool/Blackburn
UK
 

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LEARN ABOUT OPENSOLARIS

script

script(1)							   User Commands							 script(1)

NAME

       script - make record of a terminal session

SYNOPSIS

       script [-a] [filename]

DESCRIPTION

       The  script  utility  makes a record of everything printed on your screen. The record is written to filename. If no file name is given, the
       record is saved in the file typescript. See WARNINGS.

       The script command forks and creates a sub-shell, according to the value of $SHELL, and records the text from this session. The script ends
       when the forked shell exits or when Control-d is typed.

OPTIONS

       The following option is supported:

       -a    Appends the session record to filename, rather than overwriting it.

NOTES

       script places everything that appears on the screen in filename, including prompts.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+
       |CSI			     |Enabled			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       attributes(5)

WARNINGS

       script  can  pose  a  security risk when used in directories that are writable by other users (for example, /tmp), especially when run by a
       privileged user, that is, root. Be sure that typescript is not a link before running script.

SunOS 5.11							    30 Jan 2004 							 script(1)
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