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Old 09-01-2005, 05:57 AM   #1
simi_544
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Talking command to list all users of the system??


can anyone tell a command to list all the users of a system...........................
to be specific, not the users that are currently logged in, i want a command that lists all the users which have been created(including that ones created by softwares or OS itself) and i do know that it can be found by /etc/passwd...but i want a command.............

PLZ HELP>>>
 
Old 09-01-2005, 06:12 AM   #2
Rinish
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Use this

[root@host root]# lastlog

Thanks,
Rinish (rinishriju)
 
Old 09-01-2005, 06:18 AM   #3
kees-jan
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On my system, lastlog doesn't list all users, but only a subset.

Why do you want a command? What's wrong with
Code:
 cat /etc/passwd
Groetjes,

Kees-Jan
 
Old 09-01-2005, 06:30 AM   #4
Rinish
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cat /etc/passwd doesnt list your ldap users (ie: users at your domain controler) --> kees-jan

/ Rinish (rinishriju)
 
Old 09-01-2005, 06:59 AM   #5
scowles
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If your system is configured to use winbind to authenticate against AD controllers, then the following commands can be useful:

wbinfo -u
wbinfo -g

-or-

getent passwd
getent group

If you have applications specifically using LDAP, then the only command I'm aware of is "ldapsearch"
 
Old 09-02-2005, 04:38 AM   #6
simi_544
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Smile the command worked

thaks rinish for ur help
 
Old 09-27-2005, 02:23 PM   #7
amitsharma_26
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So how do you see list of users.....
Any guesses..
(I'll tell you & make it short & simple...)
As we all know the user list reside in /etc/passwd, so we can view the registered user by looking up at this file.
But now the fuss is that it also contains many other fields & machine trust accounts & inbuilt accounts.

So now we'll make a command of our own..

We'll start by
1.cat /etc/passwd

2.As we all know that by default all the users created will have their home directories in /home share
so we'll modify our command a bit by using grep.
Now it'll be
cat /etc/passwd | grep "/home"

3. Now we'll get all the user accounts which have their home share in /home.
But the only output we need is the list of users & nothing else.

4. So we'll modify our command again
cat /etc/passwd | grep "/home" |cut -d: -f1
Now what we have done is that we have piped the output of previous command to another variable "cut"
What we have done here is we have added
cut -d: -f1
-d: means delimite :
-f1 means display first field of line i.e. username.

So final command is
Cat /etc/passwd |grep "/home" |cut -d: -f1

This works until all your users have their home share in /home. If you have defined their home share to some other destination. Modify the above command.


(Hint : In previous case we started grep "/home" , this time we'll use grep "/bin/bash" or whtever valid shell you are using)

Now command will be like..
Cat /etc/passwd |grep "/bin/bash" |cut -d: f1

But this will also result some inbuilt user account.
To avoid that.. we'll now pipe the output to another variable… as we know that UID starts from 500 & above..
So our new command would be:

Cat /etc/passwd |grep "/bin/bash" |grep "[5-9][0-9][0-9]" |cut -d: -f1

----------------
Now as we are finished with desired results… its time to create an ALIAS for the above commands

Alias userlist='cat /etc/passwd |grep "/bin/bash" |grep "[5-9][0-9][0-9]" |cut -d: -f1'

Its all done.
----------------

Type userlist at your prompt & you'll get the list of users.

If you have a very large nos of users like at lalbaug & qutab centers, then you can further pipe the output of userlist command.

Userlist |grep "admin"
It will only list usernames with admin in it.
(can be modified to fit your needs)
 
Old 09-29-2005, 03:35 AM   #8
Rinish
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This command is not going to help you if you are using SSO or even an ldap/nis authentication. because centralised users will not show up at /etc/passwd file.

/ Rinish (rinishriju)
 
Old 09-29-2005, 03:45 AM   #9
amitsharma_26
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Quote:
Originally posted by Rinish
This command is not going to help you if you are using SSO or even an ldap/nis authentication. because centralised users will not show up at /etc/passwd file.

/ Rinish (rinishriju)
I am taking the case we are using /etc/passwd.
In case of LDAP/NIS... this procedure is not going to work.

Last edited by amitsharma_26; 10-06-2005 at 01:51 AM.
 
Old 09-29-2005, 04:00 AM   #10
Rinish
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is there any other command that lists all the nis/ldap users?

/ Rinish (rinishriju)
 
  


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