Bi-Weekly script Post: 302651601

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Top Forums Shell Programming and Scripting Bi-Weekly script Post 302651601 by agama on Tuesday 5th of June 2012 11:17:37 PM

06-06-2012

Registered User

The options you are trying to use with date aren't supported by all implementations. You can either install AT&T's AST tools which has a date command that does, or install the GNU date which also supports it. I personally would write it this way -- integer math is easier than trying to strip apart a human readable date and adjusting for month/year boundaries.

Code:

#!/usr/bin/env ksh                 
# should also work in bash if you prefer

now=$( date +%s )                                   # current time -- seconds past epoch
nrd=$(( (now - (now % 86400)) + (86400 * 14) ))     # two weeks from today (midnight) -- next run date
cache_file=$HOME/${0%%*/}.next                      # holds date that next run is allowed on
if [[ -f $cache_file ]]
then
    read ok2run <$cache_file
    if (( ok2run > now ))                           # next run date still in future
    then
        echo "abort: hasn't been too weeks; last execution was: $(tail -1 $cache_file)"
        exit 1
    fi
fi
printf "%s\n%s\n" $nrd "$(date)" >$cache_file       # save timestamp of next date ok and date for humans

# continue with rest of script
echo "good to go"       # just for testing/confirmation

It first gets the current time in seconds since the epoch (I believe most date commands support the +%s format, and someone will chime in here if I'm wrong). From there it computes the value of midnight two weeks out -- allowing the script to be run on the same day of the week (two weeks out), any time after midnight.

It uses a cache file to save the next valid execution timestamp, and a human readable string of the last time the command was executed. If there is no file it assumes that it is ok to run.

Hope this was at least some help.

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LEARN ABOUT OSF1

uudemon

uudemon(4)						     Kernel Interfaces Manual							uudemon(4)

NAME

       uudemon.admin,  uudemon.cleanu,	uudemon.hour,  uudemon.poll  -	Administrative shell scripts for polling remote systems, cleaning up spool
       directories, reporting status to the system administrator, and routine invocations of the uuxqt and uusched daemons

SYNOPSIS

       These shell scripts reside in the following directory:
	  /usr/lib/uucp

DESCRIPTION

       All the scripts can be run from the command line or can be run automatically by the cron daemon. To automatically run the  scripts,  remove
       the comment character (#) from the beginning of the relevant line in the /var/spool/cron/crontabs/uucp file.

       This  script  reports  status  to  the system administrator. It issues the uustat command to find out the status of uucp jobs. It mails the
       results to the uucp login ID. The script may be modified to send mail to any login ID such as the uucp administrative login ID  (uucpa)	or
       root.  This script cleans up the /var/spool/uucp and /var/spool/uucppublic directories by running the uucleanup command. The uucleanup com-
       mand is run with the following parameters: -C7, -D7, X2, -o2, -W1.  This script runs the uusched and uuxqt daemons in the background.  This
       script  polls  the  systems  listed  in	the  /usr/lib/uucp/Poll file.  The uudemon.poll script should be scheduled before the uudemon.hour
       script. This allows uudemon.poll to create any command files before cron runs the uudemon.hour script.

FILES

       Contains the uudemon.admin, uudemon.cleanu, uudemon.hour and uudemon.poll files.  Contains the uucp file.

RELATED INFORMATION

       Commands: cron(8), uucleanup(8), uusched(8), uuxqt(1)

       Files: /usr/lib/uucp delim off

																	uudemon(4)