What is the use of option -o in the useradd command? Announcing the arrival of Valued Associate #679: Cesar Manara Planned maintenance scheduled April 17/18, 2019 at 00:00UTC (8:00pm US/Eastern) 2019 Community Moderator Election Results Why I closed the “Why is Kali so hard” questionuseradd fails on archlinuxDisable login for useraddWhat does adduser do that useradd doesn't?useradd PAM authentication failedWhat variables are valid within /etc/default/useradd file?Can't add users anymore by using useradduseradd where account name is a numberDebian 9 - useraddadduser has no difference from useraddwhat is difference between useradd -m and useradd -d?
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What is the use of option -o in the useradd command?
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Why I closed the “Why is Kali so hard” questionuseradd fails on archlinuxDisable login for useraddWhat does adduser do that useradd doesn't?useradd PAM authentication failedWhat variables are valid within /etc/default/useradd file?Can't add users anymore by using useradduseradd where account name is a numberDebian 9 - useraddadduser has no difference from useraddwhat is difference between useradd -m and useradd -d?
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As the title indicates, what is the use of option -o for command useradd? What is a good use case of this option?
linux useradd
edited Apr 9 at 17:58
GAD3R
28.2k1958114
asked Apr 9 at 17:23
osmakosmak
584
add a comment |
As the title indicates, what is the use of option -o for command useradd? What is a good use case of this option?
linux useradd
edited Apr 9 at 17:58
GAD3R
28.2k1958114
asked Apr 9 at 17:23
osmakosmak
584
add a comment |
As the title indicates, what is the use of option -o for command useradd? What is a good use case of this option?
linux useradd
edited Apr 9 at 17:58
GAD3R
28.2k1958114
asked Apr 9 at 17:23
osmakosmak
584
As the title indicates, what is the use of option -o for command useradd? What is a good use case of this option?
linux useradd
linux useradd
edited Apr 9 at 17:58
GAD3R
28.2k1958114
asked Apr 9 at 17:23
osmakosmak
584
edited Apr 9 at 17:58
GAD3R
28.2k1958114
asked Apr 9 at 17:23
osmakosmak
584
edited Apr 9 at 17:58
GAD3R
28.2k1958114
edited Apr 9 at 17:58
GAD3R
28.2k1958114
edited Apr 9 at 17:58
GAD3R
28.2k1958114
28.2k1958114
asked Apr 9 at 17:23
osmakosmak
584
asked Apr 9 at 17:23
osmakosmak
584
asked Apr 9 at 17:23
osmakosmak
584
584
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
useradd’s -o option, along with its -u option, allows you to create a user with a non-unique user id. One use case for that is to create users with identical privileges (since they share the same user id) but different passwords, and if appropriate, home directories and shells. This can be useful for service accounts (although typically you’d achieve the same result using sudo nowadays); it can also be useful for rescue purposes with a root-equivalent account using a statically-linked shell such as sash.
answered Apr 9 at 17:28
Stephen KittStephen Kitt
181k25415494
add a comment |
The -o option allows the creation of users with non-unique IDs, only when you also supply the numerical value of their UID with the -u option in the same line, e.g.:
# useradd -o huey -u 501
# useradd -o dewey -u 501
# useradd -o louie -u 501
This permits setting up multiple users with same rights and priveleges, but with different home directories and passwords.
answered Apr 9 at 17:35
K7AAYK7AAY
1,1161028
# useradd -o scrooge -u 0
– rrauenza
Apr 9 at 21:44
1
Wonderful way to break all applications that parse usernames as output ofidorls -l. Givensu - scrooge -c 'id -u -n'says 'root' :)
– kubanczyk
Apr 10 at 7:30
And, quite unexpectedly, it also totalled my gdm on Ubuntu 18.04. Awww crap, I should have done it inside container...
– kubanczyk
Apr 11 at 14:30
add a comment |
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2 Answers
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2 Answers
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active
oldest
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useradd’s -o option, along with its -u option, allows you to create a user with a non-unique user id. One use case for that is to create users with identical privileges (since they share the same user id) but different passwords, and if appropriate, home directories and shells. This can be useful for service accounts (although typically you’d achieve the same result using sudo nowadays); it can also be useful for rescue purposes with a root-equivalent account using a statically-linked shell such as sash.
answered Apr 9 at 17:28
Stephen KittStephen Kitt
181k25415494
add a comment |
useradd’s -o option, along with its -u option, allows you to create a user with a non-unique user id. One use case for that is to create users with identical privileges (since they share the same user id) but different passwords, and if appropriate, home directories and shells. This can be useful for service accounts (although typically you’d achieve the same result using sudo nowadays); it can also be useful for rescue purposes with a root-equivalent account using a statically-linked shell such as sash.
answered Apr 9 at 17:28
Stephen KittStephen Kitt
181k25415494
add a comment |
useradd’s -o option, along with its -u option, allows you to create a user with a non-unique user id. One use case for that is to create users with identical privileges (since they share the same user id) but different passwords, and if appropriate, home directories and shells. This can be useful for service accounts (although typically you’d achieve the same result using sudo nowadays); it can also be useful for rescue purposes with a root-equivalent account using a statically-linked shell such as sash.
answered Apr 9 at 17:28
Stephen KittStephen Kitt
181k25415494
useradd’s -o option, along with its -u option, allows you to create a user with a non-unique user id. One use case for that is to create users with identical privileges (since they share the same user id) but different passwords, and if appropriate, home directories and shells. This can be useful for service accounts (although typically you’d achieve the same result using sudo nowadays); it can also be useful for rescue purposes with a root-equivalent account using a statically-linked shell such as sash.
answered Apr 9 at 17:28
Stephen KittStephen Kitt
181k25415494
edited Apr 10 at 8:00
answered Apr 9 at 17:28
Stephen KittStephen Kitt
181k25415494
answered Apr 9 at 17:28
Stephen KittStephen Kitt
181k25415494
answered Apr 9 at 17:28
Stephen KittStephen Kitt
181k25415494
181k25415494
add a comment |
add a comment |
The -o option allows the creation of users with non-unique IDs, only when you also supply the numerical value of their UID with the -u option in the same line, e.g.:
# useradd -o huey -u 501
# useradd -o dewey -u 501
# useradd -o louie -u 501
This permits setting up multiple users with same rights and priveleges, but with different home directories and passwords.
answered Apr 9 at 17:35
K7AAYK7AAY
1,1161028
# useradd -o scrooge -u 0
– rrauenza
Apr 9 at 21:44
1
Wonderful way to break all applications that parse usernames as output ofidorls -l. Givensu - scrooge -c 'id -u -n'says 'root' :)
– kubanczyk
Apr 10 at 7:30
And, quite unexpectedly, it also totalled my gdm on Ubuntu 18.04. Awww crap, I should have done it inside container...
– kubanczyk
Apr 11 at 14:30
add a comment |
The -o option allows the creation of users with non-unique IDs, only when you also supply the numerical value of their UID with the -u option in the same line, e.g.:
# useradd -o huey -u 501
# useradd -o dewey -u 501
# useradd -o louie -u 501
This permits setting up multiple users with same rights and priveleges, but with different home directories and passwords.
answered Apr 9 at 17:35
K7AAYK7AAY
1,1161028
# useradd -o scrooge -u 0
– rrauenza
Apr 9 at 21:44
1
Wonderful way to break all applications that parse usernames as output ofidorls -l. Givensu - scrooge -c 'id -u -n'says 'root' :)
– kubanczyk
Apr 10 at 7:30
And, quite unexpectedly, it also totalled my gdm on Ubuntu 18.04. Awww crap, I should have done it inside container...
– kubanczyk
Apr 11 at 14:30
add a comment |
The -o option allows the creation of users with non-unique IDs, only when you also supply the numerical value of their UID with the -u option in the same line, e.g.:
# useradd -o huey -u 501
# useradd -o dewey -u 501
# useradd -o louie -u 501
This permits setting up multiple users with same rights and priveleges, but with different home directories and passwords.
answered Apr 9 at 17:35
K7AAYK7AAY
1,1161028
The -o option allows the creation of users with non-unique IDs, only when you also supply the numerical value of their UID with the -u option in the same line, e.g.:
# useradd -o huey -u 501
# useradd -o dewey -u 501
# useradd -o louie -u 501
This permits setting up multiple users with same rights and priveleges, but with different home directories and passwords.
answered Apr 9 at 17:35
K7AAYK7AAY
1,1161028
answered Apr 9 at 17:35
K7AAYK7AAY
1,1161028
answered Apr 9 at 17:35
K7AAYK7AAY
1,1161028
answered Apr 9 at 17:35
K7AAYK7AAY
1,1161028
1,1161028
# useradd -o scrooge -u 0
– rrauenza
Apr 9 at 21:44
1
Wonderful way to break all applications that parse usernames as output ofidorls -l. Givensu - scrooge -c 'id -u -n'says 'root' :)
– kubanczyk
Apr 10 at 7:30
And, quite unexpectedly, it also totalled my gdm on Ubuntu 18.04. Awww crap, I should have done it inside container...
– kubanczyk
Apr 11 at 14:30
add a comment |
# useradd -o scrooge -u 0
– rrauenza
Apr 9 at 21:44
1
Wonderful way to break all applications that parse usernames as output ofidorls -l. Givensu - scrooge -c 'id -u -n'says 'root' :)
– kubanczyk
Apr 10 at 7:30
And, quite unexpectedly, it also totalled my gdm on Ubuntu 18.04. Awww crap, I should have done it inside container...
– kubanczyk
Apr 11 at 14:30
# useradd -o scrooge -u 0
– rrauenza
Apr 9 at 21:44
# useradd -o scrooge -u 0
– rrauenza
Apr 9 at 21:44
1
1
Wonderful way to break all applications that parse usernames as output of
id or ls -l. Given su - scrooge -c 'id -u -n' says 'root' :)– kubanczyk
Apr 10 at 7:30
Wonderful way to break all applications that parse usernames as output of
id or ls -l. Given su - scrooge -c 'id -u -n' says 'root' :)– kubanczyk
Apr 10 at 7:30
And, quite unexpectedly, it also totalled my gdm on Ubuntu 18.04. Awww crap, I should have done it inside container...
– kubanczyk
Apr 11 at 14:30
And, quite unexpectedly, it also totalled my gdm on Ubuntu 18.04. Awww crap, I should have done it inside container...
– kubanczyk
Apr 11 at 14:30
add a comment |
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