id
print real and effective user and group IDs
Synopsis
id
[OPTION]... [USERNAME]
add an example, a script, a trick and tips
examples
source
Does the root account always have UID/GID 0?
There are actually two parts to your question.
Does the superuser account always have uid/gid 0/0 on Linux?
Yes. As is pointed out by Rich Homolka
in
a comment, there's code in the kernel which explicitly checks
for uid 0 when needing to check for the root user, which means
that root always has at least uid 0.
Is the name of the user account with uid 0 always
root?
No. root is just a name, listed in
/etc/passwd or some other authentication store. You could just as
well call the account admin, and the OS itself won't
care, but some applications might not quite like it because they
expect there to exist a privileged account named
root. Calling the uid 0 account on a *nix
root is a very strongly held convention, but it
isn't required by the system.
It's also worth noting that, as pointed out by Simon
Richter, on BSDs there often exists a second uid 0
account, by convention named toor (which is "root"
spelled backwards). For example, FreeBSD uses it to provide a root user with a
customized shell setting, leaving the root user with a default
shell which is guaranteed to exist on the system's root
partition (useful for recovery purposes).
source
Remove Google Chrome Unique ID on Linux
Easy, it is in your Local State file.
~/.config/google-chrome/Local State
Look for user_experience_metrics (on mine it's near
the bottom of the file) then client_id. Take that
out and you should be good.
description
Print user and
group information for the specified USERNAME, or (when
USERNAME omitted) for the current user.
-a
ignore, for compatibility with other versions
-Z,
--context
print only the security context
of the current user
-g,
--group
print only the effective group
ID
-G,
--groups
print all group IDs
-n,
--name
print a name instead of a
number, for -ugG
-r,
--real
print the real ID instead of
the effective ID, with -ugG
-u,
--user
print only the effective user
ID
--help
display this help and exit
--version
output version information and
exit
Without any
OPTION, print some useful set of identified information.
copyright
Copyright © 2012 Free Software Foundation, Inc. License GPLv3+:
GNU GPL version 3 or later
<http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute
it. There is NO WARRANTY, to the extent permitted by law.
reporting bugs
Report id bugs to bug-coreutils[:at:]gnu[:dot:]org
GNU coreutils home page:
<http://www.gnu.org/software/coreutils/>
General help using GNU software:
<http://www.gnu.org/gethelp/>
Report id translation bugs to
<http://translationproject.org/team/>
see also
The full
documentation for id is maintained as a Texinfo
manual. If the info and id programs are
properly installed at your site, the command
info
coreutils 'id invocation'
should give you
access to the complete manual.
author
Written by
Arnold Robbins and David MacKenzie.