crontab in AIX | Unix Linux Forums | AIX

  Go Back    


AIX AIX is IBM's industry-leading UNIX operating system that meets the demands of applications that businesses rely upon in today's marketplace.

crontab in AIX

AIX


Tags
aix, unix

Closed Thread    
 
Thread Tools Search this Thread Display Modes
    #1  
Old 11-14-2006
smallbook smallbook is offline
Registered User
 
Join Date: Nov 2006
Last Activity: 8 June 2007, 2:50 AM EDT
Posts: 12
Thanks: 0
Thanked 0 Times in 0 Posts
crontab in AIX

Hi all, i am trying to reduce the file size of /var/adm/wtmp in my AIX servers and im using the method cp /dev/null /var/adm/wtmp to reduce it. I thought of automating it by including this command into crontab. Surprisingly, it doesn't work once i put into crontab, there is no error message thrown out, no messages, no output in fact it seems as though that command was not executed at all. How come? I tried typing manually the command and it works it only doesn't work in crontab. Any suggestion?
Sponsored Links
    #2  
Old 11-14-2006
johnf johnf is offline
Registered User
 
Join Date: May 2006
Last Activity: 10 April 2014, 6:14 AM EDT
Location: England
Posts: 406
Thanks: 7
Thanked 7 Times in 7 Posts
Please give an example of the entry from the crontab. I bet it is because you are not using the absolute path of cp as in /usr/bin/cp.
Sponsored Links
    #3  
Old 11-14-2006
smallbook smallbook is offline
Registered User
 
Join Date: Nov 2006
Last Activity: 8 June 2007, 2:50 AM EDT
Posts: 12
Thanks: 0
Thanked 0 Times in 0 Posts
I tried with full path and it doesnt work too. By the way the command i use is:

1 * * * * /usr/bin/cp /dev/null /var/adm/wtmp

THe reason i let it run every minute is because at this moment i want to monitor hence a 1 minute wait is the most appropriate.
    #4  
Old 11-14-2006
johnf johnf is offline
Registered User
 
Join Date: May 2006
Last Activity: 10 April 2014, 6:14 AM EDT
Location: England
Posts: 406
Thanks: 7
Thanked 7 Times in 7 Posts
No wonder /usr/bin/cp /dev/null > /var/adm/wtmp
Sponsored Links
    #5  
Old 11-14-2006
johnf johnf is offline
Registered User
 
Join Date: May 2006
Last Activity: 10 April 2014, 6:14 AM EDT
Location: England
Posts: 406
Thanks: 7
Thanked 7 Times in 7 Posts
I am wrong now disregard my last entry!
Sponsored Links
    #6  
Old 11-14-2006
johnf johnf is offline
Registered User
 
Join Date: May 2006
Last Activity: 10 April 2014, 6:14 AM EDT
Location: England
Posts: 406
Thanks: 7
Thanked 7 Times in 7 Posts
Try /usr/bin/cat /dev/null > /var/adm/wtmp
Sponsored Links
    #7  
Old 11-14-2006
smallbook smallbook is offline
Registered User
 
Join Date: Nov 2006
Last Activity: 8 June 2007, 2:50 AM EDT
Posts: 12
Thanks: 0
Thanked 0 Times in 0 Posts
How come i need to add the > but via command line i do not need to use that? How often will it update the log file for cron? Once i've modified i do not see it in the /var/adm/cron/log file immediately. It still doesn't work after i did that:

1 * * * * /usr/bin/cp /dev/null > /var/adm/wtmp
Sponsored Links
Closed Thread

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

More UNIX and Linux Forum Topics You Might Find Helpful
Thread Thread Starter Forum Replies Last Post
Crontab help plz chakkaravarthy Shell Programming and Scripting 2 12-15-2010 05:13 AM
Crontab and PHP help Sidabm Shell Programming and Scripting 8 12-31-2009 04:04 PM
crontab Pouchie1 Shell Programming and Scripting 3 12-20-2009 01:17 AM
Crontab RAFC_99 UNIX for Dummies Questions & Answers 4 11-30-2009 05:17 PM
ftp and crontab user` Shell Programming and Scripting 27 11-13-2006 07:02 PM



All times are GMT -4. The time now is 12:17 AM.