Different outputs for `w`, `who`, `whoami` and `id`2019 Community Moderator ElectionWhy `journalctl --list-boots` doesn't match what `uptime` and `who -b` report?Is it necessary for a login-shell to create utmp entry?Is `who mom likes` a real linux command?Difference between who and whoami commandsHow to get rsync to complain if user not found$USER != whoamiWhat is the difference between **pts** and **tty** and **:0**?who shows (unknown) user logged-in: what's going on?who, whoami, and “who am i”id and whoami commands shows different userwho and w report my user ten times..but I have only four pts openUID and GID showing root
Adventure Game (text based) in C++
How do you talk to someone whose loved one is dying?
What's the meaning of a knight fighting a snail in medieval book illustrations?
How difficult is it to simply disable/disengage the MCAS on Boeing 737 Max 8 & 9 Aircraft?
What exactly is this small puffer fish doing and how did it manage to accomplish such a feat?
Non-trivial topology where only open sets are closed
How to write cleanly even if my character uses expletive language?
Why does overlay work only on the first tcolorbox?
What is the significance behind "40 days" that often appears in the Bible?
When to use a slotted vs. solid turner?
How are passwords stolen from companies if they only store hashes?
Happy pi day, everyone!
Bach's Toccata and Fugue in D minor breaks the "no parallel octaves" rule?
"Words were different when they (lived / were living) inside of you"
Is there a hypothetical scenario that would make Earth uninhabitable for humans, but not for (the majority of) other animals?
Do I need to be arrogant to get ahead?
Can I use USB data pins as a power source?
Why one should not leave fingerprints on bulbs and plugs?
Could the Saturn V actually have launched astronauts around Venus?
How to terminate ping <dest> &
Print a physical multiplication table
Why do passenger jet manufacturers design their planes with stall prevention systems?
How could an airship be repaired midflight?
Why is a white electrical wire connected to 2 black wires?
Different outputs for `w`, `who`, `whoami` and `id`
2019 Community Moderator ElectionWhy `journalctl --list-boots` doesn't match what `uptime` and `who -b` report?Is it necessary for a login-shell to create utmp entry?Is `who mom likes` a real linux command?Difference between who and whoami commandsHow to get rsync to complain if user not found$USER != whoamiWhat is the difference between **pts** and **tty** and **:0**?who shows (unknown) user logged-in: what's going on?who, whoami, and “who am i”id and whoami commands shows different userwho and w report my user ten times..but I have only four pts openUID and GID showing root
In command line platforms online, like for instance the one on Codecademy, when I run
for cmd in w who whoami id
do
echo $cmd
$cmd
echo =========================
echo " "
done
I get
w
00:52:54 up 8 days, 14:10, 0 users, load average: 3.78, 2.98, 2.69
USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT
=========================
who
=========================
whoami
ccuser
=========================
id
uid=1000(ccuser) gid=1000(ccuser) groups=1000(ccuser)
=========================
Note that only whoami
and id
output something. When I run the same thing on my computer, I see similar results for all commands.
Why doesn't Codecademy display the user for w
and who
? What's different about these commands?
users who w whoami
New contributor
add a comment |
In command line platforms online, like for instance the one on Codecademy, when I run
for cmd in w who whoami id
do
echo $cmd
$cmd
echo =========================
echo " "
done
I get
w
00:52:54 up 8 days, 14:10, 0 users, load average: 3.78, 2.98, 2.69
USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT
=========================
who
=========================
whoami
ccuser
=========================
id
uid=1000(ccuser) gid=1000(ccuser) groups=1000(ccuser)
=========================
Note that only whoami
and id
output something. When I run the same thing on my computer, I see similar results for all commands.
Why doesn't Codecademy display the user for w
and who
? What's different about these commands?
users who w whoami
New contributor
add a comment |
In command line platforms online, like for instance the one on Codecademy, when I run
for cmd in w who whoami id
do
echo $cmd
$cmd
echo =========================
echo " "
done
I get
w
00:52:54 up 8 days, 14:10, 0 users, load average: 3.78, 2.98, 2.69
USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT
=========================
who
=========================
whoami
ccuser
=========================
id
uid=1000(ccuser) gid=1000(ccuser) groups=1000(ccuser)
=========================
Note that only whoami
and id
output something. When I run the same thing on my computer, I see similar results for all commands.
Why doesn't Codecademy display the user for w
and who
? What's different about these commands?
users who w whoami
New contributor
In command line platforms online, like for instance the one on Codecademy, when I run
for cmd in w who whoami id
do
echo $cmd
$cmd
echo =========================
echo " "
done
I get
w
00:52:54 up 8 days, 14:10, 0 users, load average: 3.78, 2.98, 2.69
USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT
=========================
who
=========================
whoami
ccuser
=========================
id
uid=1000(ccuser) gid=1000(ccuser) groups=1000(ccuser)
=========================
Note that only whoami
and id
output something. When I run the same thing on my computer, I see similar results for all commands.
Why doesn't Codecademy display the user for w
and who
? What's different about these commands?
users who w whoami
users who w whoami
New contributor
New contributor
New contributor
asked 2 hours ago
whoamiwhoami
61
61
New contributor
New contributor
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
id
reports- the current credentials of its own process; or
- the credentials of a named user, as read out of the system account database.
whoami
reports the current credentials of its own process.who
andw
report the active login sessions table from the login database.
BSD doco notes that whoami
does a subset of the job of id
, and that id
renders it obsolete.
A system does not have to have an active login sessions table. On Linux operating systems and on the BSDs, if the table has not been created at bootstrap, or has been deleted since, the system will operate without one. Logging in and out does not implicitly create it on Linux operating systems, moreover.
Furthermore, the table need not be readable by unprivileged users and neither the who
nor the w
command will report this as an error.
Further reading
- Jonathan de Boyne Pollard (2018). The Unix login database. Frequently Given Answers.
- Jonathan de Boyne Pollard (2018). "login-update-utmpx". User Commands. nosh toolset.
- Lennart Poettering et al. (2018).
systemd-update-utmp.service
. systemd manual pages. Freedesktop.org. - Is it necessary for a login-shell to create utmp entry?
- https://unix.stackexchange.com/a/409036/5132
add a comment |
Your Answer
StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "106"
;
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function()
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled)
StackExchange.using("snippets", function()
createEditor();
);
else
createEditor();
);
function createEditor()
StackExchange.prepareEditor(
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader:
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
,
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
);
);
whoami is a new contributor. Be nice, and check out our Code of Conduct.
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
var $window = $(window),
onScroll = function(e)
var $elem = $('.new-login-left'),
docViewTop = $window.scrollTop(),
docViewBottom = docViewTop + $window.height(),
elemTop = $elem.offset().top,
elemBottom = elemTop + $elem.height();
if ((docViewTop elemBottom))
StackExchange.using('gps', function() StackExchange.gps.track('embedded_signup_form.view', location: 'question_page' ); );
$window.unbind('scroll', onScroll);
;
$window.on('scroll', onScroll);
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f506757%2fdifferent-outputs-for-w-who-whoami-and-id%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
id
reports- the current credentials of its own process; or
- the credentials of a named user, as read out of the system account database.
whoami
reports the current credentials of its own process.who
andw
report the active login sessions table from the login database.
BSD doco notes that whoami
does a subset of the job of id
, and that id
renders it obsolete.
A system does not have to have an active login sessions table. On Linux operating systems and on the BSDs, if the table has not been created at bootstrap, or has been deleted since, the system will operate without one. Logging in and out does not implicitly create it on Linux operating systems, moreover.
Furthermore, the table need not be readable by unprivileged users and neither the who
nor the w
command will report this as an error.
Further reading
- Jonathan de Boyne Pollard (2018). The Unix login database. Frequently Given Answers.
- Jonathan de Boyne Pollard (2018). "login-update-utmpx". User Commands. nosh toolset.
- Lennart Poettering et al. (2018).
systemd-update-utmp.service
. systemd manual pages. Freedesktop.org. - Is it necessary for a login-shell to create utmp entry?
- https://unix.stackexchange.com/a/409036/5132
add a comment |
id
reports- the current credentials of its own process; or
- the credentials of a named user, as read out of the system account database.
whoami
reports the current credentials of its own process.who
andw
report the active login sessions table from the login database.
BSD doco notes that whoami
does a subset of the job of id
, and that id
renders it obsolete.
A system does not have to have an active login sessions table. On Linux operating systems and on the BSDs, if the table has not been created at bootstrap, or has been deleted since, the system will operate without one. Logging in and out does not implicitly create it on Linux operating systems, moreover.
Furthermore, the table need not be readable by unprivileged users and neither the who
nor the w
command will report this as an error.
Further reading
- Jonathan de Boyne Pollard (2018). The Unix login database. Frequently Given Answers.
- Jonathan de Boyne Pollard (2018). "login-update-utmpx". User Commands. nosh toolset.
- Lennart Poettering et al. (2018).
systemd-update-utmp.service
. systemd manual pages. Freedesktop.org. - Is it necessary for a login-shell to create utmp entry?
- https://unix.stackexchange.com/a/409036/5132
add a comment |
id
reports- the current credentials of its own process; or
- the credentials of a named user, as read out of the system account database.
whoami
reports the current credentials of its own process.who
andw
report the active login sessions table from the login database.
BSD doco notes that whoami
does a subset of the job of id
, and that id
renders it obsolete.
A system does not have to have an active login sessions table. On Linux operating systems and on the BSDs, if the table has not been created at bootstrap, or has been deleted since, the system will operate without one. Logging in and out does not implicitly create it on Linux operating systems, moreover.
Furthermore, the table need not be readable by unprivileged users and neither the who
nor the w
command will report this as an error.
Further reading
- Jonathan de Boyne Pollard (2018). The Unix login database. Frequently Given Answers.
- Jonathan de Boyne Pollard (2018). "login-update-utmpx". User Commands. nosh toolset.
- Lennart Poettering et al. (2018).
systemd-update-utmp.service
. systemd manual pages. Freedesktop.org. - Is it necessary for a login-shell to create utmp entry?
- https://unix.stackexchange.com/a/409036/5132
id
reports- the current credentials of its own process; or
- the credentials of a named user, as read out of the system account database.
whoami
reports the current credentials of its own process.who
andw
report the active login sessions table from the login database.
BSD doco notes that whoami
does a subset of the job of id
, and that id
renders it obsolete.
A system does not have to have an active login sessions table. On Linux operating systems and on the BSDs, if the table has not been created at bootstrap, or has been deleted since, the system will operate without one. Logging in and out does not implicitly create it on Linux operating systems, moreover.
Furthermore, the table need not be readable by unprivileged users and neither the who
nor the w
command will report this as an error.
Further reading
- Jonathan de Boyne Pollard (2018). The Unix login database. Frequently Given Answers.
- Jonathan de Boyne Pollard (2018). "login-update-utmpx". User Commands. nosh toolset.
- Lennart Poettering et al. (2018).
systemd-update-utmp.service
. systemd manual pages. Freedesktop.org. - Is it necessary for a login-shell to create utmp entry?
- https://unix.stackexchange.com/a/409036/5132
edited 53 mins ago
answered 1 hour ago
JdeBPJdeBP
36.9k475176
36.9k475176
add a comment |
add a comment |
whoami is a new contributor. Be nice, and check out our Code of Conduct.
whoami is a new contributor. Be nice, and check out our Code of Conduct.
whoami is a new contributor. Be nice, and check out our Code of Conduct.
whoami is a new contributor. Be nice, and check out our Code of Conduct.
Thanks for contributing an answer to Unix & Linux Stack Exchange!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
var $window = $(window),
onScroll = function(e)
var $elem = $('.new-login-left'),
docViewTop = $window.scrollTop(),
docViewBottom = docViewTop + $window.height(),
elemTop = $elem.offset().top,
elemBottom = elemTop + $elem.height();
if ((docViewTop elemBottom))
StackExchange.using('gps', function() StackExchange.gps.track('embedded_signup_form.view', location: 'question_page' ); );
$window.unbind('scroll', onScroll);
;
$window.on('scroll', onScroll);
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f506757%2fdifferent-outputs-for-w-who-whoami-and-id%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
var $window = $(window),
onScroll = function(e)
var $elem = $('.new-login-left'),
docViewTop = $window.scrollTop(),
docViewBottom = docViewTop + $window.height(),
elemTop = $elem.offset().top,
elemBottom = elemTop + $elem.height();
if ((docViewTop elemBottom))
StackExchange.using('gps', function() StackExchange.gps.track('embedded_signup_form.view', location: 'question_page' ); );
$window.unbind('scroll', onScroll);
;
$window.on('scroll', onScroll);
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
var $window = $(window),
onScroll = function(e)
var $elem = $('.new-login-left'),
docViewTop = $window.scrollTop(),
docViewBottom = docViewTop + $window.height(),
elemTop = $elem.offset().top,
elemBottom = elemTop + $elem.height();
if ((docViewTop elemBottom))
StackExchange.using('gps', function() StackExchange.gps.track('embedded_signup_form.view', location: 'question_page' ); );
$window.unbind('scroll', onScroll);
;
$window.on('scroll', onScroll);
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
var $window = $(window),
onScroll = function(e)
var $elem = $('.new-login-left'),
docViewTop = $window.scrollTop(),
docViewBottom = docViewTop + $window.height(),
elemTop = $elem.offset().top,
elemBottom = elemTop + $elem.height();
if ((docViewTop elemBottom))
StackExchange.using('gps', function() StackExchange.gps.track('embedded_signup_form.view', location: 'question_page' ); );
$window.unbind('scroll', onScroll);
;
$window.on('scroll', onScroll);
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown