11-12-2009
auto generate ID
Using 'awk' i want to generate new ID..which should be increment of maximum number given as UID..
eg..in /etc/passwd..3rd field is UID..and we just want next user ID for this file..keep in mind that file is not sorted..so last line in the file may not display last UID..means UIDs in file are random..so we have to figure out maximum userID from file..
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shexp(1) General Commands Manual shexp(1)
Name
shexp - display password expiration information for a user
Syntax
shexp [-q] [username]
Description
The command is used to display a user's password expiration information. The specified username, or logname if no username is supplied, is
converted to a UID by searching through the passwd file. The UID is then used to look up the user's entry in the Auth Data Base. The
password expiration information is then printed out in format.
% shexp
Expires Tue Dec 6 10:49:18 EST 1988
If the password has already expired the word Expires will be replaced with the word Expired. If password expiration is disabled for the
particular user in question the output of will be Never expires.
Options
-q Instead of displaying the expiration date and time in format, outputs it as three decimal numbers: the minimum password lifetime, the
maximum password lifetime, and the password modification time. All three numbers are displayed as they are found in the database.
Restrictions
Only the super-user may obtain information about users with UIDs other than the real UID of the invoking process.
Diagnostics
User not found in passwd data base.
There is no entry in for the specified username.
Cannot stat auth file.
The database is missing (security features may not be enabled).
Insufficient privilege.
An insufficiently privileged user is asking for information about a username with a UID different then their current real-UID.
An exit value of 0 indicates a successful operation, any other exit status indicates an error.
Files
See Also
passwd(1), getauthuid(3), auth(5)
Security Guide for Users
shexp(1)