4.3BSD-Reno/share/man/cat1/lock.0

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LOCK(1)                     UNIX Reference Manual		       LOCK(1)

NNAAMMEE
     lloocckk - reserve a terminal

SSYYNNOOPPSSIISS
     lloocckk [--pp] [--tt _t_i_m_e_o_u_t]

DDEESSCCRRIIPPTTIIOONN
     LLoocckk requests a password from the user, reads it again for verification
     and then will normally not relinquish the terminal until the password is
     repeated.	There are two other conditions under which it will terminate:
     it will timeout after some interval of time and it may be killed by some-
     one with the appropriate permission.  Options:

     --tt _t_i_m_e_o_u_t
	       The time limit (default 15 minutes) is changed to _t_i_m_e_o_u_t
	       minutes.

     --pp        Causes lloocckk to use the user's current password instead of re-
	       questing another one.

HHIISSTTOORRYY
     LLoocckk appeared in 3 BSD.