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Id command does not return correct username

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# 1  
Old 12-02-2019
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  
Old 12-02-2019
First thought: non-printing control characters in string.
# 3  
Old 12-02-2019
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  
Old 12-02-2019
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  
Old 12-02-2019
Difficult to believe cat \proc\pid\loginuid would give any meaningful output (unless you're on a windows machine running some *nix emulator).
# 6  
Old 12-02-2019
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  
Old 12-02-2019
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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