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How to use Cron command

Posted on 1997-12-01
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Last Modified: 2013-12-26
I have to automate the execution of a program into
my server and I would like to know how to use
the Cron command in order to do this from a web site
directory (I have I vortual server hosted on a Sun
station working with OS Sun solaris 2.5
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Question by:italnet
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Author Comment

by:italnet
ID: 1295705
Edited text of question
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Accepted Solution

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xilef earned 40 total points
ID: 1295706
Use the command "crontab -e" to edit your cronfile (the file which contains the commands to execute at given times). The cronfile then consists of as many lines as you want with the following format:
m h dm m dw command
Where
 m = minute
 h = hour
 dm = day of the month
 m = month
 dw = day of the week
 command = the command you want to execute
Now, replace the characters above with values when you want your command to be executed. If you want to execute something every hour, write:
0 * * * * /path/to/my/command
If you want to execute something every 15 minutes, write:
0,15,30,45 * * * * mycommand

For more information, see the man page of the crontab-command.

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Expert Comment

by:gormenghast
ID: 1295707
Hi...

Before you use crontab -e you may want to set your default editor to whatever you want to use...for example:

# EDITOR=vi
# export EDITOR

Also dont put any blank lines in the crontab file ## comments are ok.


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Author Comment

by:italnet
ID: 1295708
Hi,
Crontab does not respond to my query.
I followed all directions both  from you and
from other infos I found online....No results.
Where the mistake is?
1) I created following file txt
    0,15,30,45 * * * * /to/my/dir/file
2) [telnet] crontab filename.txt   (OK)
3) [telnet] crontab -l  (OK I listed the file)
4) [telnet] crontab run (and I receive an e-mail
    which inform on job execution but....
    he was unable to locate .cfg file
    (it is the config file of the program which
     I want to be execute. This is a strange story
     as this config file is in the same dir of  the
     program file and when I run it directly
     on telnet all works fine!)
Do you have suggestions?

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Expert Comment

by:xilef
ID: 1295709
You should probably first "cd" to this directory. Make a small script which contains "cd /path/to/your/progrm/; ./program".

This way, everything should work.

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