Solved

Perl cron jobs

Posted on 2004-03-24
7
363 Views
Last Modified: 2010-04-20
Hi

Everyday, I run ./apple which outputs some data on the screen.

I need to create a cron job to run this command on weekends and print the data into a file I can get later on monday.

From what I gathered so far, you just do:

20 9 * * 6 /usr/local/program.pl

will run program.pl at 9:20 on Saturday.  However, what do I do if apple requires "./apple" to run and what is some sample code to output the data to a file?

Dartagnan
0
Comment
Question by:Dartagnan324
  • 3
  • 2
  • 2
7 Comments
 
LVL 17

Accepted Solution

by:
owensleftfoot earned 60 total points
ID: 10672551
20 9 * * 6 /usr/local/program.pl >> myfile
0
 
LVL 40

Expert Comment

by:jlevie
ID: 10672980
If your Linux username were to be dartagnan and you were in your home directory when you executed ./apple, the cron job for that might look like:

20 9 * * 6 /home/dartagnan/apple
-- or--
20 9 * * 6 /home/dartagnan/apple >/home/dartagnan/apple.results
-- or --
20 9 * * 6 /home/dartagnan/apple >/home/dartagnan/apple.results 2>&1

Since cron will mail to the user owning the crontab any output generated from a cron job the first example will send the output from running apple to what ever user set up the crontab. The second example will write everything that apple prints to STDOUT to apple.results and the last example will write erverything printed to STDERR & STDOUT to that file.
0
 

Author Comment

by:Dartagnan324
ID: 10677903
So 20 9 * * 6 /usr/local/apple >> myfile will create a new file named "myfile" containing the data that ./apple usually outputs?

Do I need to worry about permissions?

Thx!
0
What is SQL Server and how does it work?

The purpose of this paper is to provide you background on SQL Server. It’s your self-study guide for learning fundamentals. It includes both the history of SQL and its technical basics. Concepts and definitions will form the solid foundation of your future DBA expertise.

 
LVL 17

Expert Comment

by:owensleftfoot
ID: 10678064
>> myfile will create myfile if it doesnt exist and write the data that ./apple normally does. If the file already exists, ./apples data will be apended to it. If you want to overwrite the file every time just use 1 > instead of 2. Your permissions should be ok as long as the user who owns the crontab entry has write access to the directory myfile will be created in.
0
 

Author Comment

by:Dartagnan324
ID: 10678959
hmm.....I just tested 55 10 * * 4 /usr/local/apple >> myfile and it gives Usage: /usr/local/apple [logfile] rather than the output i usually get.  How do you fix this?

Thx!
0
 
LVL 40

Assisted Solution

by:jlevie
jlevie earned 40 total points
ID: 10680110
apple may be smart enough to determine that it isn't being run from a tty and thus is asking for a file to write its results in. Try:

55 10 * * 4 /usr/local/apple /path-to/myfile
0
 

Author Comment

by:Dartagnan324
ID: 10682171
Thanks a lot!
0

Featured Post

What is SQL Server and how does it work?

The purpose of this paper is to provide you background on SQL Server. It’s your self-study guide for learning fundamentals. It includes both the history of SQL and its technical basics. Concepts and definitions will form the solid foundation of your future DBA expertise.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

rdate is a Linux command and the network time protocol for immediate date and time setup from another machine. The clocks are synchronized by entering rdate with the -s switch (command without switch just checks the time but does not set anything). …
If you have a server on collocation with the super-fast CPU, that doesn't mean that you get it running at full power. Here is a preamble. When doing inventory of Linux servers, that I'm administering, I've found that some of them are running on l…
Learn how to find files with the shell using the find and locate commands. Use locate to find a needle in a haystack.: With locate, check if the file still exists.: Use find to get the actual location of the file.:
This demo shows you how to set up the containerized NetScaler CPX with NetScaler Management and Analytics System in a non-routable Mesos/Marathon environment for use with Micro-Services applications.

777 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question