02-16-2010
Thea answers to your questions are all in unix "man passwd" in some detail. As you have not mentioned which Operating System you have it is not possible to guess what your manual contains.
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LEARN ABOUT DEBIAN
cvm-pwfile
cvm-pwfile(8) System Manager's Manual cvm-pwfile(8)
NAME
cvm-pwfile - POSIX-style passwd file module
SYNOPSIS
cvm-pwfile
CREDENTIALS
Pass phrase
DESCRIPTION
This module loads entries from an alternate password file using the fgetpwent(3) API, which requires the file to be formatted the same as
the UNIX /etc/passwd file. No group name lookups are done.
CONFIGURATION VARIABLES
CVM_PWFILE_PATH
the path to the passwd file containing the credential information.
CVM_PWFILE_PWCMP (optional)
The password comparison module to use. If it is not set, the default password comparison mode is plain-text. To use UNIX crypt
style passwords, like /etc/passwd does, set this to "crypt".
SEE ALSO
cvm-qmail(8), cvm-unix(8), cvm-sql(8), cvm-vmailmgr(8), cvm-benchclient(8), cvm-checkpassword(8), cvm-testclient(8)
http://untroubled.org/pwcmp/pwcmp.html
http://untroubled.org/cvm/cvm.html
cvm-pwfile(8)