Id command does not return correct username


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# 1  
Id command does not return correct username

On server1 the "id" command works fine and returns "myuser" user as was expected. Below are the details of the good server.
Code:
$ id -nu 501
myuser

$ cat /etc/system-release
Red Hat Enterprise Linux Server release 7.6 (Maipo)

$ uname -a
Linux server1 3.10.0-957.el7.x86_64 #1 SMP Thu Oct 4 20:48:51 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

$ id
uid=501(myuser) gid=501(was) groups=501(was),1005(coluser)

$ cat /etc/passwd | grep myuser
myuser:x:501:501::/home/myuser:/bin/bash

$ cat /etc/passwd | grep 501
myuser:x:501:501::/home/myuser:/bin/bash

However on server2 the command does not return myuser user as was expected. Below are the details of the problematic server.

Code:
$  id -nu 501
id: 501: No such user

$ cat /etc/system-release
Red Hat Enterprise Linux Server release 6.10 (Santiago)

$ uname -a
Linux server2 2.6.32-754.23.1.el6.x86_64 #1 SMP Tue Sep 17 09:46:55 EDT 2019 x86_64 x86_64 x86_64 GNU/Linux

$ id
uid=501(myuser) gid=501(staff) groups=501(staff),507(coluser)
 
$ cat /etc/passwd | grep myuser
myuser:x:501:501::/home/wlsadmin:/bin/bash

$ cat /etc/passwd | grep 501
myuser:x:501:501::/home/wlsadmin:/bin/bash
myadmin:x:502:501::/home/myadmin:/bin/bash

Can you please suggest how can I get id -nu 501 to display myuser user on problematic server2 ?
# 2  
First thought: non-printing control characters in string.
# 3  
Quote:
Originally Posted by RudiC
First thought: non-printing control characters in string.
If so, how can i get the user id of a running process that works on all OS types ? Below is what i have been using so far:

Code:
Id -nu `cat \proc\pid\loginuid`

# 4  
This is a difference in the OS version. The RHEL 7 (or variant) manual pages will have something phrased like
Quote:
USER can be either a user ID or a name
.....where RHEL 6 (or variant) does not. It is just not a valid input.





Kind regards,
Robin
# 5  
Difficult to believe cat \proc\pid\loginuid would give any meaningful output (unless you're on a windows machine running some *nix emulator).
# 6  
Quote:
Originally Posted by RudiC
Difficult to believe cat \proc\pid\loginuid would give any meaningful output (unless you're on a windows machine running some *nix emulator).
In which case what would be the best approach towards getting the username given the pid ?
# 7  
You might have some success with the following:-
Code:
getent passwd $user_number

You might need to process the output further, but it's a start.



Does that help,
Robin
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