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Full Discussion: Making wtmp files readable one at a time
Top Forums Shell Programming and Scripting Making wtmp files readable one at a time Post 302599485 by Stryfe16 on Friday 17th of February 2012 09:23:48 AM
Old 02-17-2012
Making wtmp files readable one at a time
New Unix user/scripter here. Been trying to solve a problem for two days now with no luck. Hoping someone here has an answer.

Essentially I have a list of wtmp files which I have decompressed and copied to a temporary directory. Using the following command I can turn them into a file than can normally be read with the cat command:

last -f wtmpfile > wtmpfilecopy

The problem is that I need to do this to all the files while retaining the beginning of the original file name. So it doesn't matter if anything is added to the end of the file name as long at the original file name is the beginning of the copies name. This will be going into a script. I've been experimenting with for loops as I found some information that looked promising but still have not found success.

I hope this is enough information and I hope someone out there knows a solution.

Thanks in advance!
 

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LEARN ABOUT OSF1

ac

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

NAME

       ac - Outputs connect-session records

SYNOPSIS

       ac [-dp] [-w filename] [user(s) ...]

FLAGS

       Outputs the total connect time for each midnight-to-midnight period for which a wtmp file exists. When user(s) is specified, this flag lim-
       its the output to the login names specified by any user(s) parameter(s).  Outputs the connect time total by individual login  name  of  the
       user  specified	with  the -p flag and the user(s) parameter.  Omission of this flag permits a total only for the midnight-to-midnight time
       period for all logged in users to be produced.  Specifies a wtmp file other than the /var/adm/wtmp file.  The wtmp file you access for data
       may  have  been created automatically by some shell script administration command (for example, runacct) or manually by the system adminis-
       trator when the original /var/adm/wtmp file becomes too large.

DESCRIPTION

       The ac command prints to the default output device the total connect time in hours to the nearest hundredth for all users, or  the  connect
       time  for  any  user(s) specified with the -p flag. It also prints the names of users specified by the user(s) parameter who have logged in
       during the life of the current /var/adm/wtmp file.

       Connect-time records are written by the init and the login programs and are collected in the /var/adm/wtmp file, when such a  file  exists.
       When  a	/var/adm/wtmp  file  does  not	exist, no connect-time accounting records are written; consequently, when connect-time records are
       wanted, the system administrator should create a /var/adm/wtmp file that has an initial record length of 0 (zero). Records  in  wtmp  files
       (there may be more than one such file) should be processed periodically to keep the files from becoming too large.

       When  you  use  the  runacct  command  in a shell script, additional wtmp files can be automatically created whenever the current wtmp file
       becomes too large. You can output the contents of any of these other files when you specify the -w flag and the desired wtmp filename.

       The ac command is run independently with respect to any accounting shell procedure created or run by any of the acct/* shell procedures	or
       runacct commands.

EXAMPLES

       To obtain an output of the total connect time for all users who have logged in during the life of the current wtmp data file, enter:

	      /usr/sbin/ac  To	obtain	an  output of the total connect time for grossman and mcwhinney as recorded in the default wtmp data file,
	      enter:

	      /usr/sbin/ac  grossman  mcwhinney To obtain an output of the connect time subtotals for grossman and mcwhinney as  recorded  in  the
	      default wtmp data file, enter:

	      /usr/sbin/ac -p  grossman  mcwhinney

FILES

       Specifies the command path.  Is the active data file for the collection of connect-time records.

RELATED INFORMATION

       Commands:  login(1), init(8) delim off

																	     ac(8)
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