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Full Discussion: Why does "ps -[u|U] username" not list processes when username is numeric?
Top Forums UNIX for Beginners Questions & Answers Why does "ps -[u|U] username" not list processes when username is numeric? Post 303039932 by crimso on Thursday 17th of October 2019 08:34:40 PM
Old 10-17-2019
Hello Corona688,
I have both RHEL6.5 and RHEL7.5 and they behave the same. I've not thought about testing it on our couple Ubuntu servers but the need never comes up. The number that we're using as the login ID are employee numbers affectionately known as WorkDay ID's assigned by the AD group. We're using them so the NAS filers play nice with the Linux user when accessing mixed filesystems with permissions controlled by Windows. We were basically forced to since the storage group didn't want to maintain a Linux user name to WorkDay ID map. As for the UID I'm simply incrementing to the next available number. It never dawned on me when this took place that ps would interpret the numeric login ID as the UID. I have to assume that's what's happening. I may end up having to create an alias much like the code you suggested.
 

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LEARN ABOUT MINIX

subgid

SUBGID(5)						   File Formats and Conversions 						 SUBGID(5)

NAME

       subgid - the subordinate gid file

DESCRIPTION

       Each line in /etc/subgid contains a user name and a range of subordinate group ids that user is allowed to use. This is specified with
       three fields delimited by colons (":"). These fields are:

       o   login name or UID

       o   numerical subordinate group ID

       o   numerical subordinate group ID count

       This file specifies the group IDs that ordinary users can use, with the newgidmap command, to configure gid mapping in a user namespace.

       Multiple ranges may be specified per user.

       When large number of entries (10000-100000 or more) are defined in /etc/subgid, parsing performance penalty will become noticeable. In this
       case it is recommended to use UIDs instead of login names. Benchmarks have shown speed-ups up to 20x.

FILES

       /etc/subgid
	   Per user subordinate group IDs.

       /etc/subgid-
	   Backup file for /etc/subgid.

SEE ALSO

       login.defs(5), newgidmap(1), newuidmap(1), newusers(8), subuid(5), useradd(8), userdel(8), usermod(8), user_namespaces(7).

shadow-utils 4.5						    01/25/2018								 SUBGID(5)
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