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PWCK !!!PWCK NAME SYNOPSIS DESCRIPTION OPTIONS FILES SEE ALSO DIAGNOSTICS AUTHOR ---- !!NAME pwck - verify integrity of password files !!SYNOPSIS __pwck__ [[__-r__] [[''passwd shadow''] !!DESCRIPTION __pwck__ verifies the integrity of the system authentication information. All entries in the ''/etc/passwd'' and ''/etc/shadow'' are checked to see that the entry has the proper format and valid data in each field. The user is prompted to delete entries that are improperly formatted or which have other incorrectable errors. Checks are made to verify that each entry has - the correct number of fields - a unique user name - a valid user and group identifier - a valid primary group - a valid home directory - a valid login shell The checks for correct number of fields and unique user name are fatal. If the entry has the wrong number of fields, the user will be prompted to delete the entire line. If the user does not answer affirmatively, all further checks are bypassed. An entry with a duplicated user name is prompted for deletion, but the remaining checks will still be made. All other errors are warning and the user is encouraged to run the __usermod__ command to correct the error. The commands which operate on the ''/etc/passwd'' file are not able to alter corrupted or duplicated entries. __pwck__ should be used in those circumstances to remove the offending entry. !!OPTIONS By default, __pwck__ operates on the files ''/etc/passwd'' and ''/etc/shadow''. The user may select alternate files with the ''passwd'' and ''shadow'' parameters. Additionally, the user may execute the command in read-only mode by specifying the __-r__ flag. This causes all questions regarding changes to be answered __no__ without user intervention. !!FILES /etc/passwd - user account information /etc/shadow - encrypted password information /etc/group - group information !!SEE ALSO usermod(8), group(5), passwd(5), shadow(5) !!DIAGNOSTICS The __pwck__ command exits with the following values: 0 Success 1 Syntax Error 2 One or more bad password entries 3 Cannot open password files 4 Cannot lock password files 5 Cannot update password files !!AUTHOR Julianne Frances Haugh (jfh@austin.ibm.com) ----
5 pages link to
pwck(8)
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pwconv(8)
pwunconv(8)
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grpconv(8)
grpunconv(8)
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