32v 1m login
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Revision as of 15:36, 26 October 2009 by Neozeed (New page: LOGIN(1) UNIX Programmer's Manual LOGIN(1) == NAME == login - sign on == SYNOPSIS == login [ username ] == DESCRIPTION == The _l_o_g_i_n comman...)
LOGIN(1) UNIX Programmer's Manual LOGIN(1)
login - sign on
login [ username ]
The _l_o_g_i_n command is used when a user initially signs on, or it may be used at any time to change from one user to another. The latter case is the one summarized above and described here. See `How to Get Started' for how to dial up initially.
If _l_o_g_i_n is invoked without an argument, it asks for a user name, and, if appropriate, a password. Echoing is turned off (if possible) during the typing of the password, so it will not appear on the written record of the session.
After a successful login, accounting files are updated and the user is informed of the existence of ._m_a_i_l and message- of-the-day files. _L_o_g_i_n initializes the user and group IDs and the working directory, then executes a command inter- preter (usually _s_h(1)) according to specifications found in a password file. Argument 0 of the command interpreter is `-sh.
Login is recognized by _s_h(1) and executed directly (without forking).
/etc/utmp accounting /usr/adm/wtmp accounting /usr/spool/mail/* mail /etc/motd message-of-the-day /etc/passwd password file
`Login incorrect,' if the name or the password is bad. `No Shell', `cannot open password file', `no directory': consult a programming counselor.