The passwd data structure is used to hold information about
entries in the system user data base. It has at least the following members:
char *pw_name
- The user's login name.
char *pw_passwd.
- The encrypted password string.
uid_t pw_uid
- The user ID number.
gid_t pw_gid
- The user's default group ID number.
char *pw_gecos
- A string typically containing the user's real name, and possibly other
information such as a phone number.
char *pw_dir
- The user's home directory, or initial working directory. This might be
a null pointer, in which case the interpretation is system-dependent.
char *pw_shell
- The user's default shell, or the initial program run when the user logs in.
This might be a null pointer, indicating that the system default should
be used.
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