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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 5 hours ago
whoamiwhoami
161
161
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 |
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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 3 hours ago
answered 4 hours ago
JdeBPJdeBP
37k475176
37k475176
add a comment |
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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.
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