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Annotation of researchv10dc/man/man8/login.8, revision 1.1.1.1

1.1       root        1: .TH LOGIN 8
                      2: .CT 1 sa_auto
                      3: .SH NAME
                      4: login \- sign on
                      5: .SH SYNOPSIS
                      6: .B /etc/login
                      7: .I name
                      8: .br
                      9: .B /etc/login
                     10: .B -f
                     11: .I name
                     12: [
                     13: .I cmd
                     14: ]
                     15: .br
                     16: .B /etc/login
                     17: .B -p
                     18: .I passwd-line
                     19: [
                     20: .I cmd
                     21: ]
                     22: .SH DESCRIPTION
                     23: .I Login
                     24: is executed by
                     25: .IR getty (8).
                     26: See the Introduction to this volume for how to dial up initially.
                     27: .PP
                     28: .I Login
                     29: asks for a password if appropriate.
                     30: Echoing is turned off during the typing of the password.
                     31: The
                     32: .B -f
                     33: option forces login of the named user, without a password.
                     34: .B -p
                     35: is similar to
                     36: .BR -f ,
                     37: but an entire line of password file information
                     38: is supplied.
                     39: .PP
                     40: .I Login
                     41: initializes the userid, the groupid, and the working directory
                     42: according to specifications found in the password file;
                     43: see
                     44: .IR passwd (5).
                     45: It also initializes environment variables
                     46: .SM PATH
                     47: and
                     48: .SM HOME .
                     49: Finally it executes a command interpreter (usually
                     50: .IR  sh (1)).
                     51: Argument 0 of the command interpreter is its name with
                     52: a dash
                     53: .RL ( - )
                     54: prepended.
                     55: If
                     56: a
                     57: .I cmd
                     58: argument was present,
                     59: two additional arguments
                     60: .B -c
                     61: .I cmd
                     62: are passed,
                     63: and environment variable
                     64: .SM REXEC
                     65: is set to
                     66: .LR 1 .
                     67: .PP
                     68: Upon a successful login,
                     69: accounting files are updated and,
                     70: if no options are present,
                     71: the message of the day is printed
                     72: and the user is informed of the
                     73: existence of mail.
                     74: .PP
                     75: Successful logins are recorded in
                     76: .F /etc/utmp
                     77: and
                     78: .FR /usr/adm/wtmp .
                     79: If
                     80: .I cmd
                     81: was present,
                     82: .L *
                     83: is appended to the login name in
                     84: .IR wtmp ,
                     85: and
                     86: no record is made in
                     87: .IR utmp .
                     88: .PP
                     89: Only the super-user may execute
                     90: .IR login .
                     91: .SH FILES
                     92: .TF /usr/spool/mail/*
                     93: .TP
                     94: .F /etc/utmp
                     95: accounting
                     96: .TP
                     97: .F /usr/adm/wtmp
                     98: accounting
                     99: .TP
                    100: .F /usr/spool/mail/*
                    101: mail
                    102: .TP
                    103: .F /etc/motd
                    104: message-of-the-day
                    105: .TP
                    106: .F /etc/passwd
                    107: password file
                    108: .TP
                    109: .F /etc/group
                    110: groups file
                    111: .SH "SEE ALSO"
                    112: .IR newgrp (1),
                    113: .IR passwd (1),
                    114: .IR environ (5),
                    115: .IR passwd (5),
                    116: .IR getty (8),
                    117: .IR init (8),
                    118: .IR su (8),
                    119: .IR svcmgr (8).
                    120: .SH DIAGNOSTICS
                    121: `Login incorrect':
                    122: the name or the password is bad.
                    123: .br
                    124: `No Shell' or `no directory': the initial shell or
                    125: home directory specified in the password file does not exist.
                    126: .br
                    127: `Cannot open password file': things are badly curdled.
                    128: .SH BUGS
                    129: Information passed to options
                    130: .B -p
                    131: and
                    132: .B -f
                    133: is not checked.
                    134: Only trusted programs should run
                    135: .IR login .
                    136: Only trusted programs may usefully do so anyway;
                    137: .I login
                    138: has no privileges.

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