I updated sudoers file with the following line sudo ALL=(ALL) NOPASSWD:/usr/bin/docker  after save the changes, I can't run any sudo command and I can't edit sudoers file I get the following error:  Sorry, user xxxx is not allowed to execute '/bin/bash' as root on xxxx.  How to fix the issue ?
17150
How do I edit an invalid sudoers file? It throws the below error and it's not allowing me to edit again to fix it.  Here is what happens:  $ sudo visudo &gt;&gt;&gt; /etc/sudoers: syntax error near line 28 &lt;&lt;&lt; sudo: parse error in /etc/sudoers near line 28 sudo: no valid sudoers sources found, quitting
67372
Why  do we use sudo to perform a terminal command as an administrative? Why isn't it  admin or something else? Is there a reason for sudo?
6272
I've read  and am interested in this line:     You should never use normal sudo to start graphical applications as Root.   Why? What is the difference? Please provide a simple explanation, as I'm just a normal desktop user.
120288
I'm a systems admin for a company and was thrown into a horribly configured server. In the midst of my refactoring I was adding users to my /etc/sudoers file. I seem to have accidentally removed my server admin account from the sudoers file access.  I know what I did wrong (i accidentally commented out the %admin line) question being, how can I reinstate my server admin access in the file without having to restart anything.   Here's how it looks right now:  ## ## User privilege specification ## root ALL=(ALL) ALL #%admin  ALL=(ALL) ALL %superuser ALL=(ALL) ALL "user1" ALL=(ALL) ALL "user2" ALL=(ALL) ALL   Also note that my users do not have permission for sudo for some reason:  Realtor-Station-3-27:~ user1$ sudo -i  WARNING: Improper use of the sudo command could lead to data loss or the deletion of important system files. Please double-check your typing when using sudo. Type "man sudo" for more information.  To proceed, enter your password, or type Ctrl-C to abort.  Password: user1 is not in the sudoers file.  This incident will be reported. Realtor-Station-3-27:~ user1$
14250
What is the difference between the following commands:  su sudo -s sudo -i sudo bash   I know for su I need to know the root password, and for sudo I have to be in the sudoers file, but once executed what is difference?  I know there is a difference between su and sudo -s because my home directory is /root after I execute su, but my home directory is still /home/myname after sudo -s. But I suspect this is just a symptom of an underlying difference that I'm missing.
105861
On a colleagues computer, everytime I use a sudo command, I get this error:  sudo: must be setuid root  I tried various things mentioned on the internet, like changing the permissions to 4755 from a live cd, but even this command from a live-cd   sudo chmod 4755 /media/device/usr/bin/sudo  gives the same error.  EDIT: The colleague told me that he executed this command, god knows why :/  sudo chmod -R 777 / or sudo chmod -R 777 He isnt exactly sure.
2422
Inspired by this ....  I am the sole person using my system with 12.04. Every time I issue a sudo command; the system asks for the user password (which is good in its own way).  However I was thinking; without activating the root account; how can I execute the sudo commands which will not ask for user password to authenticate.  NOTE: I want to execute sudo command without authenticating via password; only when they are executed via terminal. I don't want to remove this extra layer of security from other functions such a while using 'Ubuntu software center' or executing a bash script by drag-drop something.sh file to the terminal.
77744
This error occurs whenever I try to work with sudo. I changed the permissions of /var/ folder to 777 and I think this causes the error. Please help me get back a functional sudo and /var.
4844
I accidentally executed      sudo chmod -R 777 /   I was actually trying to change a specific folder permission recursively, btw i did stop the command before it changed everything.  But now, i can't execute for example      sudo   Every time i try to sudo something it throws me this error:     effective uid is not 0, is sudo installed setuid root?   Btw i know i can use chown -R root:root /usr/bin where sudo is located, but of course i don't have the permissions to do this.  So, how can i revert this process? Or at least save the sudo file without reinstalling everything?  The system is still connected to the internet and seems to work fine besides the sudo issue.  Thanks in advance.
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Whenever I open the terminal,   To run a command as administrator (user "root"), use "sudo &lt;command&gt;".   See "man sudo_root" for details.   appears before the terminal. How do I get that to go away?
58568
I am trying to make a script like this:  #!/bin/bash sudo -s something...   When I execute it, I get a new shell but something is executed only when I exit the shell created by sudo -s, not inside it.  Any help?
119517
Whenever I issue command sudo apt-get install ** it does not ask for password, not in my admin user too.  How to make it prompt for password?  My sudoer :  ubuntu:~$ sudo cat /etc/sudoers # # This file MUST be edited with the 'visudo' command as root. # # Please consider adding local content in /etc/sudoers.d/ instead of # directly modifying this file. # # See the man page for details on how to write a sudoers file. # Defaults    env_reset Defaults    secure_path="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"  # Host alias specification  # User alias specification  # Cmnd alias specification  # User privilege specification root    ALL=(ALL:ALL) ALL  # Members of the admin group may gain root privileges %admin ALL=(ALL) ALL  # Allow members of group sudo to execute any command %sudo   ALL=(ALL:ALL) ALL  # See sudoers(5) for more information on "#include" directives:  #includedir /etc/sudoers.d ALL ALL=(ALL) NOPASSWD:ALL
26102
I have recently disabled  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 haven't been able to figure out a solution for, I am unable to run commands which go along the lines of:   sudo &lt;command&gt; &amp;   In the past I would have run a sudo command before that, it would have cached my password and allowed me to run sudo commands without prompt for the next few minutes, and thus it would allow me to run the command.  But when I run it now as there is no caching before hand and as it starts a new thread immediately and sudo doesn't even prompt me for a password, I am unable to run it in this way.  So unless I run sudo -i before it I am unable to run a command in this format which is becoming rather annoying. So I was wondering if there is any way to get around this and still run programs and commands in this way?  I am running Ubuntu GNOME 15.10 with GNOME 3.18, and specifically the program I want to run in this fashion is etherape if that makes any difference, but I would really like the solution to work for all programs and commands.
6139
What is the default password of the sudo? I visit some forums, it tells that the default password is password, but it doesn't work, how can I determine the password?
22565
Why does redirection, using sudo give me an error for the following commands?   $ sudo printf "foo" &gt;/etc/file bash: /etc/file: Permission denied  $ sudo printf "foo" ~/file; cat ~file &gt;/etc/file  bash: /etc/file: Permission denied   ...yet I have no such problem when I use an editor, or cp. I don't think I've ever tried this before, so I don't know if there is something haywire on my system, or if this is normal. It seems a bit restrictive to be normal, but(?) maybe it is intended to be restrictive...  (using Ubuntu)
23068
I need to run something as sudo without a password, so I used visudo and added this to my sudoers file:  MYUSERNAME ALL = NOPASSWD: /path/to/my/program   Then I tried it out:  $ sudo /path/to/my/program [sudo] password for MYUSERNAME:    Why does it ask for a password? How can I run/use commands as root with a non-root user, without asking for a password?
22747
Why do I get   -bash: test: Permission denied   when I run   sudo echo "xyz" &gt; test   The directory permissions are:  drwxr-xr-x 3 root root 4096 2014-08-05 16:26    I have no problem creating a file in the directory using sudo.  But why can't I sudo echo into it?