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Full Discussion: Before I delete any file in Unix, How can I check no open file handle is pointing to that file?
Operating Systems Solaris Before I delete any file in Unix, How can I check no open file handle is pointing to that file? Post 302459831 by kchinnam on Tuesday 5th of October 2010 12:45:49 PM
Old 10-05-2010
Quote:
Nothing bad happens if you delete a file in use.
My observation is different. If we delete "catalina.out" from a tomcat web server logs folder. Tomcat would not create another log,, until we restart tomcat. Where as other applications do create a new log file.

I am trying to find a safe way to do a generic log file rotation including logs like "catalina.out". Also try to know if a file is being actively used or not to make a better decision before log/file rotation.

When I query using lsof I get this -->
Quote:
> lsof ../jakarta/logs/catalina.out
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
java 1162 <UID> 1w VREG 314,7 1284251 19505649 ../jakarta/logs/catalina.out
java 1162 <UID> 2w VREG 314,7 1284251 19505649 ../jakarta/logs/catalina.out
What is the meaning of FD --> 1w 2w ?


2. What is the difference between 1w, 2w(in lsof output) Vs <PID>o (o in fuser output) ?

Quote:
> fuser -fu ../jakarta/logs/catalina.out
../jakarta/logs/catalina.out: 13601o(<userid>)
Last edited by kchinnam; 10-05-2010 at 02:32 PM.. Reason: masking secure info
 

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LEARN ABOUT SUSE

aulast

AULAST:(8)						  System Administration Utilities						AULAST:(8)

NAME

       aulast - a program similar to last

SYNOPSIS

       aulast [ options ] [ user ] [ tty ]

DESCRIPTION

       aulast  is  a  program  that prints out a listing of the last logged in users similarly to the program last and lastb. Aulast searches back
       through the audit logs or the given audit log file and displays a list of all users logged in (and out) based on the range of time  in  the
       audit  logs. Names of users and tty's can be given, in which case aulast will show only those entries matching the arguments. Names of ttys
       can be abbreviated, thus aulast 0 is the same as last tty0.

       The pseudo user reboot logs in each time the system is rebooted. Thus last reboot will show a log of all reboots since  the  log  file  was
       created.

       The  main  difference  that  a user will notice is that aulast print events from oldest to newest, while last prints records from newest to
       oldest. Also, the audit system is not notified each time a tty or pty is allocated, so you may not see quite  as  many  records	indicating
       users and their tty's.

OPTIONS

       --bad  Report on the bad logins.

       --extract
	      Write raw audit records used to create the displayed report into a file aulast.log in the current working directory.

       -f file
	      Use the file instead of the audit logs for input.

       --proof
	      Print out the audit event serial numbers used to determine the preceeding line of the report. A Serial number of 0 is a place holder
	      and not an actual event serial number. The serial numbers can be used to examine the actual audit records in more  detail.  Also	an
	      ausearch query is printed that will let you find the audit records associated with that session.

       --stdin
	      Take audit records from stdin.

EXAMPLES

       To see this month's logins
       ausearch --start this-month --raw | aulast --stdin

SEE ALSO

       last(1), lastb(1), ausearch(8), aureport(8).

AUTHOR

       Steve Grubb

Red Hat 							     Nov 2008								AULAST:(8)
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