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Best way to schedule a task that is be excuted years later

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# 1  
Old 01-20-2010
Best way to schedule a task that is be excuted years later
What is the best way to schedule a task that is be executed years later? Like execute a script after 4 years.

Is cron the best method for that?

Any other option other than cron/at ? Smilie
# 2  
Old 01-20-2010
Code:
$ date -d "+4 years " +%s
1390194960
$ date +%s
1263964545

So add one if-then command in your script, such as: (not tested)

Code:
if [ `date +%s` > 1390194960 ]; then 
#  Your script here
fi

You can run the script every day by cronjob.
# 3  
Old 01-20-2010
You can use at, with either of these syntaxes:
Code:
at 201401201200
at +4 years

Note that the first one uses a 24 hour format.
# 4  
Old 01-20-2010
Yes, cron / at is a best option.

But it depends, You have to be sure that, nobody will edit your cron entry ( say, two or three admins then somebody may ? ).

But in case of at, you have to remove it by finding the at job id. So you might find that better suited for you, where as in cron all the CRON jobs will be given for edit with 'crontab -e'.
# 5  
Old 01-20-2010
To remove all the 'at' jobs :
Code:
atrm $(atq|cut -f1)

# 6  
Old 01-20-2010
Will the task set using at get reset on reboot ?
# 7  
Old 01-20-2010
YES ! Smilie
Another advantage is that if the computer is down at the specified time, at will run the job at bootub.
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