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Random man page:
btmp(4) -- utmp, wtmp, btmp entry format
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These files, which hold user and accounting information for such commands as last, who, write, and login (see last(1), who(1), write(1), and login(1)), have the following structure as defined by : #define UTMP_FILE "/etc/utmp" #define WTMP_FILE "/var/adm/wtmp" #define BTMP_FILE "/var/adm/btmp" #define ut_name ut_user struct utmp { char ut_user[8]; /* User login name */ char ut_id[4];... |
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