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Operating Systems AIX Impacts of emptying /var/adm/wtmp file ? Post 302319080 by bakunin on Saturday 23rd of May 2009 07:10:57 PM
Old 05-23-2009
candlejack is correct. Do not delete the file, because processes are accessing it. instead reduce it to zero length by issuing

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

The difference is that this way the file will keep its inode and hence alle the processes accessing it will still find the file where they look for it.

If you delete the file and it is created anew it would most probably get a different inode, which is a potential hazard.

I hope this helps.

bakunin
 

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wtmpconvert(8)						      System Manager's Manual						    wtmpconvert(8)

NAME
wtmpconvert - Modify connect time accounting records from DIGITAL UNIX releases 4.0x and prior to new format SYNOPSIS
/usr/lbin/wtmpconvert [-vnrp?h] input_file [output_file] OPTIONS
Restore new format to old format. Verbose. Display lines while converting. Do not preserve contents of input file. Formatted print only. Do not convert. (May be used with the -r option). Display usage message. DESCRIPTION
The wtmpconvert command reads records from a connect time accounting file, such as /var/adm/wtmp, and converts the record format to the updated struct utmp format. If no output file is specified or if the output file path is identical to the input file path, wtmpconvert makes a backup copy of the original input file using the following algorithm: If filename.orig exists. Where n is a unique number. The wtmpconvert command attempts to detect an input file that is in the wrong format (for example, input file is already a new format file). A warning message is issued in this case, but conversion continues. EXIT STATUS
Success. An error occurred. EXAMPLES
To convert an old format accounting file to the new format: wtmpconvert /var/adm/wtmp.prev Upon completion of this command, /var/adm/wtmp.prev will have been converted to the new format. The original /var/adm/wtmp.prev is renamed to /var/adm/wtmp.prev.orig. To convert a wtmp file in new format to the old format: wtmpconvert -r /var/adm/wtmp /var/adm/wtmp.old FILES
Accounting header files that define the format for the login database file. The active login/logoff database files. SEE ALSO
Commands: acct(8), acctcon(8), acctmerg(8), date(1), runacct(8) Functions: getutent(3) Files: utmp(4), wtmp(4) wtmpconvert(8)
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