Questions related to the sudo command that allows users to run programs with the privileges of a different user (normally the root user).

learn more… | top users | synonyms (1)

25
votes
3answers
9k views

Redirect the output using `sudo` [duplicate]

I have a small question regarding using sudo with output redirect >. To enable IP forwrding, someone can use the command: echo 1 > /proc/sys/net/ipv4/ip_forward Executing this command will ...
24
votes
7answers
72k views

How to avoid prompt password for sudo?

I know I can go root (super user) via the su command but I have to authorize it after firing the commands. Is there a way I can go root and authorize (with password) in one line
24
votes
5answers
12k views

What if I accidentally run command “chmod -R” on system directories (/, /etc, …)

I accidently ran sudo chmod 755 -R / instead of sudo chmod 755 -R ./ I stopped it after few seconds, but now there is some problems such as sudo: must be setuid root How can I revert ...
24
votes
6answers
43k views

sudo error, is mode 0777, should be 0440

I am getting sudo errors, how do I fix this error? sudo: /etc/sudoers is mode 0777, should be 0440 sudo: no valid sudoers sources found, quitting
23
votes
2answers
60k views

Why don't I have a password for “su”? Problems with “sudo”

I have installed Ubuntu using the GUI, giving myself a password and everything. I do not intricately remember the process. However, what worries me is that I don't know the following password: $ su ...
23
votes
5answers
2k views

How important is the sudo password?

I know that the sudo password protects my computer from being locally hacked by someone having physical access to it (edit : actually, it doesn't). My password is strong enough for that purpose, but I ...
23
votes
1answer
28k views

Remove sudo privileges from a user (without deleting the user)

If you give a user sudo privileges how can I remove the sudo privileges and make the user become just a regular user? I used: sudo adduser username sudo Now I've changed my mind.
22
votes
6answers
35k views

How could I list all super users?

I want a command to list all users who have root privileges i.e. sudo ? Suppose I'm a sudoer user. How could I know all other sudoer users?
22
votes
4answers
58k views

sudo: source: command not found

I've been updating some of the default profile for bash, and saw from the tutorials I was following that I could reload the new profile with the new environment settings by using: source /etc/bash....
22
votes
2answers
55k views

Setting the PATH so it applies to all users, including root/sudo

The instructions in How do I set PATH variables for all users on a server? work to set the PATH for all 'normal' users. However, if I do sudo -s and then printenv PATH the updated path is not shown. I'...
21
votes
6answers
174k views

How can I permanently grant root access to a user? [duplicate]

Possible Duplicate: How do I grant sudo privileges to an existing user? I've been searching for the answer to this but all I find is "It's not a good idea" or "We don't recommend it" and some ...
21
votes
3answers
1k views

How do I run a sudo command needing password input in the background?

I have recently disabled sudo's authentication caching ability so that it now prompts me for a password every time. And though this is good for security, it has caused one slight problem which I ...
21
votes
6answers
1k views

How to make super-user permissions last longer than using sudo? [duplicate]

Is there a way through which I can make the sudo command give me permissions for a longer period than its default time? It can be a pain having to keep entering the sudo password, when requiring the ...
21
votes
3answers
75k views

How to give nopasswd access to multiple commands via sudoers?

Below is what I know: I have to add this below line in sudoers file to give rights to the user for particular task. user_name ALL=NOPASSWD: /usr/bin/apt-get install In this case I want to give ...
21
votes
4answers
15k views

Is the difference between sudo and gksu the same as the difference between sudo -i and sudo -s?

Is the difference between sudo cmd and gksu cmd, the same as the difference between starting a shell with sudo -i and sudo -s? ... or put another way, Is sudo cmd the same as sudo -i cmd and gksu ...
21
votes
1answer
25k views

What exactly does sudo apt-get -f install do?

I have seen it before. I am just wondering what exactly does it do?
20
votes
8answers
48k views

How do I fix a “E: The method driver /usr/lib/apt/methods/http could not be found.” error?

I tried updating my packages from the terminal and this is what I got: $ sudo apt-get update E: The method driver /usr/lib/apt/methods/http could not be found. E: The method driver /usr/lib/apt/...
20
votes
6answers
26k views

su command + authentication failure

I am having problems with the su command. I know my password and I am typing it correctly but su indicates authentication failure. So I checked on the internet and then went into recovery mode and ...
20
votes
1answer
6k views

How to configure pkexec?

Reading these questions and answers: When to use pkexec vs. gksu/gksudo? Why is gksu no longer installed by default? brought me another one that will create problems for new users of that command:...
19
votes
2answers
13k views

warning message at command line `sudo`

Everytime I try to sudo something at the terminal, I get a warning message: alexandre@XPS-15Z $ sudo mount file.iso /mnt/ -o loop [sudo] password for alexandre: no talloc stackframe at ../source3/...
19
votes
3answers
5k views

How to cancel the currently-applied remaining sudo time-out?

When I've just run sudo, and don't want it to remain active for the normal duration of its time-out, how can I cancel that remaining active time-out? sudo -k kills it for the current terminal ...
19
votes
2answers
14k views

“sudo cd …” one-liner?

Occasionally I want to cd into a directory where my user does not have permission, so I resort to sudo. The obvious command sudo cd somedir doesn't work: $ sudo mkdir test $ sudo chmod go-rxw test $ ...
18
votes
7answers
13k views

Nothing shows up in the terminal when I type my password

When I'm about to install a program in the terminal it wants the password: [sudo] password for xxx: But when I want to type my password it happens nothing. What should I do?
18
votes
8answers
56k views

/usr/bin/sudo must be owned by uid 0 and have the setuid bit set

I have run following command accidentally sudo chown [username] -hR / Now sudo su getting error: sudo: /usr/bin/sudo must be owned by uid 0 and have the setuid bit set How to Solve This?
18
votes
1answer
36k views

difference between gksudo and sudo? [duplicate]

Possible Duplicate: What is the difference between “gksudo nautilus” and “sudo nautilus”? I have tiny script that I want it to run on start-up, but it needs sudo ...
17
votes
1answer
2k views

What does su > echo “<username>” mean?

When I was entering the command su > echo "sachin" it was asking for a password. When I gave my password, some strange things happened as you can see: One more thing: there is another user, ...
17
votes
1answer
13k views

Is it possible to give sudo access to only a particular command?

Background: I have a development machine with LAMP setup. Several developers would access the machine from time to time. Every time they make some change in a configuration file they will need to ...
17
votes
1answer
915 views

Get email notification for using 'sudo' by a specific user

I have a server set-up and I let somebody that I trust with a little bit of sudo access have it. However, I also want an email anytime that they use sudo. I know that I can use Defaults ...
17
votes
6answers
51k views

How can I fix broken sudo - sudo: parse error in /etc/sudoers near line 23?

I am getting this error: sudo: parse error in /etc/sudoers near line 23 sudo: no valid sudoers sources found, quitting sudo: unable to initialize policy plugin I was trying to disable password ...
17
votes
2answers
12k views

How do I prevent PolicyKit from asking for a password?

For years, I've had the following in my sudoers file: scott ALL=NOPASSWD: ALL For those who don't know, this prevents sudo and friends (gksudo, etc.) from asking for a password. However, over the ...
16
votes
2answers
46k views

sudo apt-get remove does not remove config files

I'm new to Linux/Ubuntu - and I'm wondering if the behaviour I'm seeing is as designed. I have installed vsftpd: sudo apt-get install vsftpd Then I remove: sudo apt-get remove vsftpd However, ...
16
votes
4answers
10k views

What is the functional difference between sudo su and sudo -i?

Why is one preferred over the other in this example? sudo su echo "options iwlwifi 11n_disable=1" >> /etc/modprobe.d/iwlwifi.conf exit Please provide links to Ubuntu documentation.
16
votes
4answers
1k views

How to enter password only once in a bash script needing sudo

Data I want operator users on this machine to mount their own cifs shares The sudoers file already contains the /bin/mount -t cifs //*/* /media/* -o username=* command for all operators I want the ...
16
votes
2answers
10k views

What does sudo service do?

As far as I know and it seems that other people have the same opinion sudo is a command that executes something with administrative privileges. However when I run rcconf I can see this line: [*] ...
16
votes
4answers
9k views

Setting TeX Live path for root

I have installed TeX Live 2011 vanilla and I have trouble setting the TeX Live path for root (in Ubuntu 11.10). The problem is that when I run sudo tlmgr I get: sudo: tlmgr: command not found To ...
16
votes
4answers
334k views

how to use sudo command to install .tar.gz? [duplicate]

Possible Duplicate: How to install a .tar.gz (or .tar.bz2) file? I am newbie to ubuntu. I would like someone to explain how to use sudo command to unzip & install .tar.gz file to me.
16
votes
9answers
23k views

How to run an Application as another user?

I use krusader for file management stuff. the problem is that apache's DocumentRoot should be under chown www-data:www-data /path/to/www. so using krusader (which is run under my account) I've not ...
15
votes
2answers
4k views

Why do I need root privileges to umount a drive at the command line, but not in Nautilus? How to change that?

When I insert a thumb drive, media card, or USB hard drive, to unmount it via the command line, I need to use: sudo umount /media/the_device But, I can unmount the device in a file manager like ...
15
votes
3answers
2k views

How often is the password asked for sudo commands? Where can I set it up?

I execute quite a lot of sudo commands. I noticed that if I execute one and then another one within few minutes, the 2nd time I don't get the message: [sudo] password for my_username: but I do ...
15
votes
7answers
38k views

How can I run an application with a GUI as admin from a non-admin user session?

I defined 2 user accounts: one with admin privilege (with sudo right) => lets call it adminuser. a 2nd one without any privilege => lets call it normaluser and I configure the autologin on this 2nd ...
15
votes
2answers
10k views

How to use a python virtualenv with sudo?

I am trying to make a python environment separate from the system one (using virtualenv) in a directory which is not under /home, because I need to use it to build other software that has to be ...
15
votes
2answers
592 views

What's the difference between login as user and changing users using su through root?

When you have a server of some sort you can access it through, e.g., ssh user1@ip and you can also do ssh root@ip to go to your root user with su priveleges and then go to su user1. In my thinking ...
15
votes
0answers
15k views

Unable to resolve host [duplicate]

Possible Duplicate: sudo: unable to resolve host (none) When I enter a sudo command in to the terminal I get an error. Just before it asks for a password it says: sudo: unable to resolve ...
14
votes
7answers
13k views

What are the benefits of sudo over su?

What is the actual benefit that Ubuntu (or Debian derivatives) achieve by disabling root user? Everywhere I read, it says to prevent unintentional damages for inexperienced users. I want to know what ...
14
votes
3answers
34k views

Adding NOPASSWD in /etc/sudoers doesn't work

On 14.04 here. I SSHed into my machine, added the following line to /etc/sudoers: myuser ALL=NOPASSWD: ALL And then tried running: sudo mkdir /etc/blah ...and I'm being asked for my password. ...
14
votes
4answers
2k views

I change the last line in /etc/passwd and I can't use sudo

Here is what I have done: Change a username in the last line: tiny to abc tiny@tty7:~$ sudo vim /etc/passwd Change this: tiny:x:1000:1000:tiny,,,:/home/tiny:/bin/bash to this: abc:x:1000:1000:tiny,...
14
votes
1answer
15k views

Cannot lock '/etc/group' in recovery mode

I've currently booted into recovery mode, because I removed my sole user from admin :/ When I run adduser oadams admin, I get gpasswd: cannot lock /etc/group; try again later. For what it's worth, ...
14
votes
3answers
1k views

How can I force sudo to always ask for a password after waking from suspend?

Say I execute a command with sudo, then if I use sudo within the next 15/5 minutes (not sure how long it remembers me for) it won't prompt me for a password. It will only prompt me again if I haven't ...
14
votes
1answer
1k views

What happens if you use @reboot reboot in crontab file?

What would happen if you use: sudo crontab -e And add the line: @reboot reboot Will it go into a infinite loop of rebooting?!
14
votes
3answers
8k views

Broken sudo: can't open /etc/sudoers: No such file or directory

I have a live USB persistent version of Ubuntu 11.04 installed with Unetbootin. After some time I experienced some bugs while upgrading the kernel and trying to use my second screen on my laptop. ...