kオプションをつかうんだ。
man -k utmp dump-utmp (8) - print a utmp file in human-readable format endutent [getutent] (3) - access utmp file entries getutent (3) - access utmp file entries getutid [getutent] (3) - access utmp file entries getutline [getutent] (3) - access utmp file entries getutmp (3) - copy utmp structure to utmpx, and vice versa getutmpx [getutmp] (3) - copy utmp structure to utmpx, and vice versa login (3) - write utmp and wtmp entries logout [login] (3) - write utmp and wtmp entries pututline [getutent] (3) - access utmp file entries sessreg (1) - manage utmp/wtmp entries for non-init clients setutent [getutent] (3) - access utmp file entries utmp (5) - login records utmpname [getutent] (3) - access utmp file entries utmpx.h [utmpx] (0p) - user accounting database definitions wtmp [utmp] (5) - login records
