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Best practices for using 'sudo su'

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http://askubuntu.com – I have been using the terminal for a while now and sometimes (actually, a lot of times) I use a command, like: cp /etc/test ~/testFolder/ and I get this error: cp: cannot open `/etc/test` for reading: Permission denied That's the moment I remember that I forgot the sudo command before it, so I press Up arrow and then CTRL+A to go to the beggining of the line and insert a sudo there: sudo cp /etc/test ~/testFolder/ There are even worse scenarios where you use vim to edit a file, you forget sudo command and don't see the warning when the program starts, you edit the entire file and in t (HowTos)

Danial's picture
Submitted by Danial on 10/18/2012

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Possible Duplicate: Redirecting stdout to a file you don’t have write permission on

I'm quite new to Linux and I have a permissions questions. I'm using Linux Mint.

If I go to /opt and do a $ echo hi > file it says permission denied.

If I try with sudo, like this $ sudo echo > file it says permission denied.

Isn't sudo to execute the command as superuser?

When I use tcpdump on centos 6, I got a permission denied error even when I was root. My command is like this:

sudo tcpdump -i eth0 -G 10 -w test.dmp port 80

i have tried with -Z root or -Z my_username but no luck

sudo tcpdump -i eth0 -Z root -G 10 -w test.dmp port 80 sudo tcpdump -i eth0 -Z myuser_name -G 10 -w test.dmp port 80

Does anybody know how to make it work?

I want to be able to run a command, it fails cause it doesn't have proper permissions. Then I can write "please" to sudo the command I just ran.

Here's what I want to do in the terminal:

$ run command "you don't have access to do that" $ please "ran successfully"

I saw that !!

i screwed up big time.

I am newbie in Linux word. I want to implement a bosh server.

Because it is hard on Windows platform I decided to deploy it on a Ubuntu virtual machine via vmware. I made installation without problems. I followed the processes on this page.

sudo: Permission denied 1 year 2 weeks ago

Thankfully, that did it.  I never knew about the su command.  sudo is not asking me for a password.There really aren't any more details to post, anything starting with 'sudo' gives me the error (without anything else happening first).

In Ubuntu lightdm log-in screen, guest session can be logged in without a password. Although guest gets lower privilege and can’t run sudo command, you can remove it from login screen via following way. Edit LightDM configuration file “/etc/lightdm/lightdm.conf”. This need root privilege, use sudo nautilus command to start file browser with super user.

Terminal won't input password when I/it asks for it.

I am trying to install wine through terminal.

4 Tricks with sudo 2 years 6 days ago

I think that sudo is become a wide used command with Ubuntu, where you don’t even have a root password, before that probably it was used only in some data-centers to restrict access to some commands.

sudo allows a permitted user to execute a command as the superuser or another user, as specified in the sudoers file.