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Utmp
utmp, wtmp, btmp and variants such as utmpx, wtmpx and btmpx are files on Unix-like systems that keep track of all logins and logouts to the system. Format utmp, wtmp and btmp * utmp maintains a full accounting of the ''current'' status of the system, system boot time (used by ''uptime''), recording user logins at which terminals, logouts, system events etc. * wtmp acts as a historical utmp * btmp records failed login attempts These files are not regular text files, but rather a binary format which needs to be edited by specially crafted programs. The implementation and the fields present in the file differ depending on the system or the libc version, and are defined in the utmp.h header file. The wtmp and btmp format are exactly like utmp except that a null value for "username" indicates a logout on the associated terminal (the actual user name is located by finding the preceding login on that terminal). Furthermore, the value "~" as a terminal name with username "shutdow ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lastlog
lastlog is a program available on most Linux distributions. It formats and prints the contents of the last login log file, /var/log/lastlog (which is a usually a very sparse file), including the login name, port, and last login date and time. It is similar in functionality to the BSD program last, also included in Linux distributions; however, last parses a different binary database file (Utmp, /var/log/wtmp and /var/log/btmp). Usage Lastlog prints its output in column format with login-name, port, and last-login-time of each and every user on the system mentioned in that order. The users are sorted by default according to the order in /etc/passwd However, it can also be used to modify the records kept in /var/log/lastlog. $ lastlog Username Port From Latest root **Never logged in** user tty3 Sun Jan 14 16:29:24 +0130 2019 External links * {{Unix commands Unix user manageme ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |