Clear wtmp


 
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Operating Systems AIX Clear wtmp
# 1  
Old 04-23-2010
Clear wtmp

Hello,
Is there a difference between the following commands besides consider the file permissions?
Code:
/usr/sbin/acct/nulladm /var/adm/wtmp

Code:
>/var/adm/wtmp

Code:
cat /dev/null >/var/adm/wtmp

Today I tried the second command and it worked...
# 2  
Old 04-23-2010
/usr/sbin/acct/nulladm is a shell script which you can read in plain text.

Notice that nulladm allows for the file to be missing or have the wrong permissions. The end product of nulladm is an empty file with the correct permissions.

Bar the permission aspect, all three methods are equivalent when the file exists.
# 3  
Old 04-23-2010
Quote:
Originally Posted by methyl
/usr/sbin/acct/nulladm is a shell script which you can read in plain text.

Notice that nulladm allows for the file to be missing or have the wrong permissions. The end product of nulladm is an empty file with the correct permissions.

Bar the permission aspect, all three methods are equivalent when the file exists.
Thanks for your answer!

Last edited by x_adm; 04-23-2010 at 10:15 AM.. Reason: First I tried to answer with Firefox but it didn't work correctly...
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