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1 perry 1 PWCK
2 !!!PWCK
3 NAME
4 SYNOPSIS
5 DESCRIPTION
6 OPTIONS
7 FILES
8 SEE ALSO
9 DIAGNOSTICS
10 AUTHOR
11 ----
12 !!NAME
13
14
15 pwck - verify integrity of password files
16 !!SYNOPSIS
17
18
19 __pwck__ [[__-r__] [[''passwd shadow'']
20 !!DESCRIPTION
21
22
23 __pwck__ verifies the integrity of the system
24 authentication information. All entries in the
25 ''/etc/passwd'' and ''/etc/shadow'' are checked to see
26 that the entry has the proper format and valid data in each
27 field. The user is prompted to delete entries that are
28 improperly formatted or which have other incorrectable
29 errors.
30
31
32 Checks are made to verify that each entry has
33
34
35 - the correct number of fields
36 - a unique user name
37 - a valid user and group identifier
38 - a valid primary group
39 - a valid home directory
40 - a valid login shell
41
42
43 The checks for correct number of fields and unique user name
44 are fatal. If the entry has the wrong number of fields, the
45 user will be prompted to delete the entire line. If the user
46 does not answer affirmatively, all further checks are
47 bypassed. An entry with a duplicated user name is prompted
48 for deletion, but the remaining checks will still be made.
49 All other errors are warning and the user is encouraged to
50 run the __usermod__ command to correct the
51 error.
52
53
54 The commands which operate on the ''/etc/passwd'' file
55 are not able to alter corrupted or duplicated entries.
56 __pwck__ should be used in those circumstances to remove
57 the offending entry.
58 !!OPTIONS
59
60
61 By default, __pwck__ operates on the files
62 ''/etc/passwd'' and ''/etc/shadow''. The user may
63 select alternate files with the ''passwd'' and
64 ''shadow'' parameters. Additionally, the user may execute
65 the command in read-only mode by specifying the __-r__
66 flag. This causes all questions regarding changes to be
67 answered __no__ without user intervention.
68 !!FILES
69
70
71 /etc/passwd - user account information
72 /etc/shadow - encrypted password information
73 /etc/group - group information
74 !!SEE ALSO
75
76
77 usermod(8), group(5), passwd(5),
78 shadow(5)
79 !!DIAGNOSTICS
80
81
82 The __pwck__ command exits with the following
83 values:
84
85
86 0
87
88
89 Success
90
91
92 1
93
94
95 Syntax Error
96
97
98 2
99
100
101 One or more bad password entries
102
103
104 3
105
106
107 Cannot open password files
108
109
110 4
111
112
113 Cannot lock password files
114
115
116 5
117
118
119 Cannot update password files
120 !!AUTHOR
121
122
123 Julianne Frances Haugh (jfh@austin.ibm.com)
124 ----
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