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Full Discussion: who, w and company
Top Forums Shell Programming and Scripting who, w and company Post 302411924 by jim mcnamara on Friday 9th of April 2010 09:48:56 PM
Old 04-09-2010
The wtmpx (utmpx is also the file on some systems) file has login history. You can use last or a custom written c tool to find what you need.
Code:
last -100 joe_user

These files keep data from the last reboot on. Any user who logs in is usually recorded.

man wtmpx
man last
and maybe man utmpx
 

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utmpx(4)							   File Formats 							  utmpx(4)

NAME
utmpx, wtmpx - utmpx and wtmpx database entry formats SYNOPSIS
#include <utmpx.h> /var/adm/utmpx /var/adm/wtmpx DESCRIPTION
The utmpx and wtmpx files are extended database files that have superseded the obsolete utmp and wtmp database files. The utmpx database contains user access and accounting information for commands such as who(1), write(1), and login(1). The wtmpx database contains the history of user access and accounting information for the utmpx database. USAGE
Applications should not access these databases directly, but should use the functions described on the getutxent(3C) manual page to inter- act with the utmpx and wtmpx databases to ensure that they are maintained consistently. FILES
/var/adm/utmpx user access and adminstration information /var/adm/wtmpx history of user access and adminstrative information SEE ALSO
getutxent(3C), wait(3C), wait.h(3HEAD) SunOS 5.11 6 Mar 2008 utmpx(4)
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