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Old 03-20-2010, 05:57 AM   #1
anurupr
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i need to constantly run a script in the background


i need to run a script which checks if a cd is mounted or not
 
Old 03-20-2010, 05:59 AM   #2
acid_kewpie
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right, did you wnat to ask a question about doing that??

Assuming you want to know how to, I'd say you don't need to run it constantly, just frequently, in qhich case a cronjob is the order of the day.
 
Old 03-20-2010, 06:04 AM   #3
Maligree
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duplicate of this thread
 
Old 03-20-2010, 06:16 AM   #4
sd||
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you can do this using cron jobs


edit /etc/crontab

know more about this
Quote:
man cron
man crontab

Last edited by sd||; 03-20-2010 at 06:18 AM.
 
Old 03-20-2010, 06:23 AM   #5
nonamenobody
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Quote:
Originally Posted by anurupr View Post
i need to run a script which checks if a cd is mounted or not
It would be helpful to know what you are trying to achieve (i.e. why are you checking if it is mounted), as there may be a better solution.

That said, to do what you ask, simply put the code that you want to repeat in a 'while true' loop. Looping continuously without a break might be quite resource intensive, so you may do better to stick a sleep command into the loop, so that your check runs every x seconds/minutes. If you only want to perform the check once per minute or less, then cron may be a better solution.

The best solution may be to use udev rules so that a script is run once when a CD is mount and/or unmounted - see http://www.reactivated.net/writing_u...l#external-run

Oh, and to put the script in the background run it with an ampersand after it (&) - though it will quit when it's parent process is killed, e.g. if you close the terminal that issued the command. If you want to keep it running permanently you need to send it the NOHUP signal using kill. You may even want to make a daemon that runs on start up - by creating the relevant scripts in /etc/init.d/ and /etc/rc.d/...
 
Old 03-20-2010, 06:29 AM   #6
nonamenobody
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Quote:
Originally Posted by Maligree View Post
duplicate of this thread
Not exactly a duplicate, although his titles are very similar. In the first thread he didn't even know how to check if the CD was mounted, now wants to do the next bit. It is more a continuation than a duplicate - he probably should have used the same thread though.
 
Old 03-20-2010, 09:00 AM   #7
onebuck
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Hi,

Quote:
Originally Posted by anurupr View Post
i need to run a script which checks if a cd is mounted or not
So you've shown us your need! What's your deed?

We will aid you when you help yourself to a solution. Provide us with what you have attempted and then maybe someone will be able to assist. Such an open ended query without details is rather hard to aid.

Just a few links to aid you to gaining some understanding;

Linux Documentation Project
Rute Tutorial & Exposition
Linux Command Guide
Utimate Linux Newbie Guide
LinuxSelfHelp
Getting Started with Linux
Bash Reference Manual
Advanced Bash-Scripting Guide
Linux Home Networking


The above links and others can be found at 'Slackware-Links'. More than just SlackwareŽ links!
 
Old 03-20-2010, 05:15 PM   #8
Tinkster
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Please post your thread in only one forum. Posting a single thread in the most relevant forum will make it easier for members to help you and will keep the discussion in one place. This thread is being closed because it is a duplicate.


http://www.linuxquestions.org/questi...g-bash-796643/
 
  


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