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39 .Nd substitute user identity
42 .Op Fl K | Fl Fl no-kerberos
46 .Oo Fl i Ar instance \*(Ba Xo
47 .Fl Fl instance= Ns Ar instance
50 .Oo Fl c Ar command \*(Ba Xo
51 .Fl Fl command= Ns Ar command
54 .Op Ar login Op Ar "shell arguments"
57 will use Kerberos authentication provided that an instance for the
58 user wanting to change effective UID is present in a file named
60 in the target user id's home directory
62 A special case exists where
65 needs to contain an entry for:
66 .Ql user Ns / Ns Ao instance Ac Ns @ Ns REALM
76 In the absence of either an entry for current user in said file or
77 other problems like missing
78 .Ql host/hostname@REALM
80 keytab, or user typing the wrong password,
82 will fall back to traditional
92 access only to members of the group
94 or to any user (with knowledge of the
96 password) if that group
97 does not exist, or has no members.
99 The options are as follows:
114 leave environment unmodified.
117 .Fl Fl instance= Ns Ar instance
118 root instance to use.
121 .Fl Fl command= Ns Ar command