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BSD 2.11 - man page for lock (bsd section 1)

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LOCK(1) 										  LOCK(1)

       lock - reserve a terminal

       lock [ -p ] [ -t timeout ]

       Lock requests a password from the user, reads it again for verification and then will nor-
       mally 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 someone with the appropriate permission.  The default time limit is 15
       minutes,  which	may be changed with the -t option where timeout is the time limit in min-
       utes.  The -p option causes lock to use the user's current password instead of  requesting
       another one.

3rd Berkeley Distribution		February 23, 1989				  LOCK(1)
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