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linux cron job

Sabrin
Sabrin asked
on
Medium Priority
351 Views
Last Modified: 2010-04-20
hello,
I have logged in as root into my Centos v4.3 server and did 'crontab -e' then added this two lines

0 0 * * * cp /dev/null /home/virtual/domain1.net/var/log/httpd/error.log
0 1 * * * cp /dev/null /home/virtual/domain2.com/var/log/httpd/error.log

then saved the file, how can I run those two lines every hour ?
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ozo
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Most Valuable Expert 2014
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Commented:
0 * * * * cp /dev/null /home/virtual/domain1.net/var/log/httpd/error.log
Kerem ERSOYPresident

Commented:
Hi,

0 * * * * > /home/virtual/domain1.net/var/log/httpd/error.log

will do too :)

Commented:
hi in the crontab -e option

these are the options of first five fields

min
hour
date in month (1 to 31)
month
weekday

for more options you can always do a "man 5 crontab" which gives examples and other options as to how to do it.

goutham

Author

Commented:
I want every hour for the 3 domains in each one after 5 minutes

1 hours
0 0 * * * cp /dev/null /home/virtual/domain1.net/var/log/httpd/error.log

1 hours after 5 minutes of 1st
0 1 * * * cp /dev/null /home/virtual/domain2.com/var/log/httpd/error.log

1 hours after 5 minutes of 2nd
0 0 * * * cp /dev/null /home/virtual/domain3.net/var/log/httpd/error.log

like that!!

Author

Commented:
not all at the same time
President
Commented:
0 * * * * cp /dev/null /home/virtual/domain1.net/var/log/httpd/error.log
5 * * * * cp /dev/null /home/virtual/domain2.com/var/log/httpd/error.log
10 * * * * cp /dev/null /home/virtual/domain3.net/var/log/httpd/error.log

This will run domain1.net at every hour , 0 minute
domain2.net every hour 5 minute
domain3 very hour 10 minute
ISn't it what you want ?

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Author

Commented:
thanks
Kerem ERSOYPresident

Commented:
Yr welcome

Commented:
Hi,
this will clear domain1 on every full hour (1:00, 2:00 etc.), domain2 every hour + 5 minutes (1:05, 2:05 etc.) and domain3 on every full hour + 10 minutes (1:10, 2:10 etc.):

0 * * * * cat /dev/null > /home/virtual/domain1.net/var/log/httpd/error.log
5 * * * * cat /dev/null > /home/virtual/domain2.com/var/log/httpd/error.log
10 * * * * cat /dev/null > /home/virtual/domain3.net/var/log/httpd/error.log

Commented:
Ooops, seems I kept my comment window open too long! 8-))
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