/etc/shadow stores actual password in encrypted format for user’s account with additional properties related to user password.
The password expiration information for a user is contained in the last 6 fields. Password expiration for a select user can be disabled by editing the /etc/shadow file
However I recommend using chage command. The chage command changes the number of days between password changes and the date of the last password change. This information is used by the system to determine when a user must change his/her password.
To list current aging type chage command as follows:
# chage -l vivek
Output:
Last password change : May 22, 2007 Password expires : never Password inactive : never Account expires : never Minimum number of days between password change : 0 Maximum number of days between password change : 99999 Number of days of warning before password expires : 7
To disable password aging / expiration for user foo, type command as follows and set:
Minimum Password Age to 0
Maximum Password Age to 99999
Password Inactive to -1
Account Expiration Date to -1
Interactive mode command:
# chage username
OR
# chage -I -1 -m 0 -M 99999 -E -1 username
Updated for accuracy.
25 comment
thanks a lot!! this really helped me!
Great advice, thanks !!
The simplest way to change the command-line version so that it actually works is as follows:
# chage -I -1 -m 0 -M 99999 -E -1 username
Most shells (certainly
bash) require escaping ‘-‘ characters.wow this is the most retarded thing i have read today.
“-” does not need to be escaped in any shell as it has no special meaning, it is just a convention used in most unix programs to identify option parameters (it is a slash under most windows utils, e.g. “ipconfig /a”). characters you may need to escape are ” or ‘ or $ or ` and so on (see http://www.gnu.org/software/bash/manual/bashref.html#Quoting ).
you ‘may’ need to tell a program to not read a for example a file name “rm -my_file_name.txt” as an option via “rm — -my_file_name.txt” but thats about it.
the original code snippet /actually/ works without any escaping.
thousand thanks
Any solution to set ACCOUNT EXPIRE after x days without login to the system instead of set a fix date?
Is there a way to do this to all user accounts at once? I’ve tried using “*”, but had no luck with that. Thanks.
James,
Try something as follows to list permission for all user (backup your /etc/passwd and /etc/shadow before you run following commands) :
awk -F':' '{ if ( $3 >= 1000 ) print $0 }' /etc/passwd | cut -d: -f1 | xargs -I {} chage -l {}Replace chage -l with ‘chage -I -1 -m 0 -M 99999 -E -1’
awk -F':' '{ if ( $3 >= 1000 ) print $0 }' /etc/passwd | cut -d: -f1 | xargs -I {} chage -I -1 -m 0 -M 99999 -E -1 {}Just to eliminate the unnecessary “cut”, make it:
awk -F':' '{ if ( $3 >= 1000 ) print $1 }' /etc/passwd | xargs -I {} chage -I -1 -m 0 -M 99999 -E -1 {}Thanks alot.
Hi ,
thanx …
awk -F’:’ ‘{ if ( $3 >= 1000 ) print $1 }’ /etc/passwd | xargs -I {} chage -I -1 -m 0 -M 99999 -E -1 {}
is helped me
I get this error while executing the command,
[root@lnxtestsrv1 ~]# awk -F ':' '{ if ( $3 >= 1000 ) print $1 }' /etc/passwd | xargs -I {} chage -I -1 -m 0 -M 99999 -E -1 {} xargs: invalid option -- I Usage: xargs [-0prtx] [-E eof-str] [-e[eof-str]] [-I replace-str] [-i[replace-str]] [-L max-lines] [-l[max-lines]] [-n max-args] [-s max-chars] [-P max-procs] [--null] [--eof[=eof-str]] [--replace[=replace-str]] [--max-lines[=max-lines]] [--interactive] [--max-chars=max-chars] [--verbose] [--exit] [--max-procs=max-procs] [--max-args=max-args] [--no-run-if-empty] [--version] [--help] [command [initial-arguments]] Report bugs to .Can you tell me your UNIX / Linux distro version and xargs version?
Very useful information. I used it immediately on some IT slobs I was outsourcing.
Better to use ” -M -1 “: 99999 will expire after 99999 days, -1 tells no expiration needed!
Bye
Mariano
we can use ,below command as well for password agin
passwd -x -1 vivek
awk -F’:’ ‘{ if ( $3 >= 1000 ) print $0 }’ /etc/passwd | cut -d: -f1 | xargs -I {} chage -l {}
Last password change : Aug 06, 2012
Password expires : never
Password inactive : never
Account expires : never
Minimum number of days between password change : 0
Maximum number of days between password change : 99999
Number of days of warning before password expires : 7
I am getting only this much output.how can I change the policy for all user?
I just use this, “chage -E -1 -M -1 username”
This info is great! A bunch of us have been wracking our brains for a couple of days trying to figure out a problem and this was the fix.
Excellent!
Best and shortest solution is: passwd -x 99999
“PERFECTLY WORKED”
Chage my password
i got big list with no heading (user id)
awk -F':' '{ if ( $3 >= 1000 ) print $0 }' /etc/passwd | cut -d: -f1 | xargs -I {} chage -l {}I need user heading, is that possible ?
How to revert this change to original value.