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Full Discussion: expiry of a linux id?
Top Forums Shell Programming and Scripting expiry of a linux id? Post 302266560 by Autocross.US on Wednesday 10th of December 2008 02:13:57 PM
Old 12-10-2008
The password expiration information is stored in /etc/shadow. A typical entry may look like this:

testuser:$1$DgtYUQyf$AbAvYwwEqSJHnsmCcfUg6/:14139:7:90:14:::

The bold number is the days since Jan 1, 1970 that password was last changed. 'man 5 shadow' for what the other fields are. You could write a shell/perl script to parse out these values and do some math to determine the actual day and then email on a certain condition (email user 14 days before password expiration, for example). This would require setting up .forward files or aliases for your users though.

The easiest way to see when a password is going to expire is to run 'chage -l USERNAME' from the command line.
 

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CHSH(1) 							   User Commands							   CHSH(1)

NAME
chsh - change your login shell SYNOPSIS
chsh [-s shell] [-l] [-u] [-v] [username] DESCRIPTION
chsh is used to change your login shell. If a shell is not given on the command line, chsh prompts for one. chsh is used to change local entries only. Use ypchsh, lchsh or any other implementation for non-local entries. OPTIONS
-s, --shell shell Specify your login shell. -l, --list-shells Print the list of shells listed in /etc/shells and exit. -u, --help Print a usage message and exit. -v, --version Print version information and exit. VALID SHELLS
chsh will accept the full pathname of any executable file on the system. However, it will issue a warning if the shell is not listed in the /etc/shells file. On the other hand, it can also be configured such that it will only accept shells listed in this file, unless you are root. EXIT STATUS
Returns 0 if operation was successful, 1 if operation failed or command syntax was not valid. SEE ALSO
login(1), passwd(5), shells(5) AUTHOR
Salvatore Valente <svalente@mit.edu> AVAILABILITY
The chsh command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/. util-linux July 2009 CHSH(1)
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