Questions about using the command-line interface (CLI).

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52
votes
5answers
174k views

What is a terminal and how do I open and use it?

What is a terminal? How do I open a terminal window? How do I use the terminal?
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?
580
votes
7answers
1.5m views

How do I install a .deb file via the command line?

How do I install a .deb file via the command line?
51
votes
7answers
7k views

How can I easily share the output of a command or a text file with others?

I recently asked a question on Ask Ubuntu (or somewhere else), and a comment or answer asks me to paste the contents of some file or the output of a command to troubleshoot my problem. How do I do ...
70
votes
5answers
37k views

When using sudo with redirection, I get 'permission denied'

When using sudo to allow edits to files, I regularly get 'permission denied'. For example, my mouse is jittery and sluggish, so I want to disable polling: sudo echo "options drm_kms_helper poll=N"&...
231
votes
7answers
486k views

What is the correct way to completely remove an application?

I've searched the net for such information and found different command lines, like these ones: sudo apt-get remove application sudo apt-get remove application* sudo apt-get remove --purge ...
69
votes
5answers
145k views

Running programs in the background from terminal

How do I run a program in the background of a shell, with the ability to close the shell while leaving the program running? Lets say my UI is having problems or for some reason, I need to boot up a ...
76
votes
11answers
506k views

How do I run .sh files?

Whenever I open a .sh file, it opens it in gedit instead of the terminal. I can't find any option similar to Right Click → Open With → Other Application... → Terminal. How do I open this file in the ...
21
votes
7answers
31k views

How to run scripts without typing the full path?

I'd like to know if there is a way to run program/shell script without typing full path: /opt/idea/bin/idea.sh
492
votes
6answers
1.5m views

How can I add a new user as sudoer using the command line?

After I add a user using adduser, I can't see it via System->Administration->Users and Groups unless I logout and then login again. Is that normal? Also, can I set a newly added user as a ...
273
votes
9answers
632k views

What does “sudo apt-get update” do?

I am wondering what sudo apt-get update does? What does it update?
93
votes
6answers
141k views

How to create a permanent “alias”? [duplicate]

If you create an alias for example: alias cls="clear" It exists untill you kill terminall session. When you start a new terminal window the alias doesn't exist any more. How to create "permanent" ...
94
votes
7answers
730k views

How to install Chrome browser properly via command line?

I am trying to install chrome browser via command line. I tried this: $ apt-cache search chrome browser The results show that the proper term is "chrome-browser," so I tried that: $ sudo apt-get ...
79
votes
9answers
134k views

How to change LCD brightness from command line (or via script)?

To work around bug #1005495 (changing LCD brightness via hotkeys impossible), I'd like to have one command line query for increasing and one for reducing the brightness of my LCD. I could then map a ...
60
votes
4answers
159k views

How to connect and disconnect to a network manually in terminal?

Since the network manager is troubling me so much I want to replace it (possibly wicd orNM from ppa:volanin). I do not know how to connect and disconnect to the network through the terminal without ...
105
votes
4answers
189k views

Execute sudo without Password?

Inspired by this question.... 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 ...
92
votes
8answers
130k views

How do you select the fastest mirror from the command line?

I want to update my sources.list file with the fastest server from the command line in a fresh Ubuntu Server install. I know this is trivially easy with the GUI, but there doesn't seem to be a simple ...
35
votes
6answers
27k views

How to find out the terminal command of an application?

I want to use some applications shown on the Unity Launcher in a terminal, but I need to know the appropriate command to run them. How can I achieve that?
196
votes
5answers
1.0m views

Change folder permissions and ownership

I would like the user to have full rights on this folder (as well as all sub-directories and files in it): ~/.blabla currently owned by root. I have found numerous posts (in this forum and ...
75
votes
7answers
281k views

How to create a bootable Ubuntu USB flash drive from terminal?

Is there any way to create a bootable Ubuntu USB flash drive from the terminal without using any third-party applications like YUMI,Unetbootin, etc. I tried to create a bootable Ubuntu flash drive ...
-3
votes
0answers
389 views

Unable to locate package [duplicate]

There are many questions about Unable to locate package. For example : if user try to install package by using apt-get then the following error shown. (Here package is used only as example for ...
275
votes
17answers
399k views

How do I fix my locale issue?

I am getting this message every time I do something like starting or stopping a service. perl: warning: Setting locale failed. perl: warning: Please check that your locale settings: ...
13
votes
3answers
11k views

What is the best way to learn how to use Ubuntu with terminal? [closed]

Frequently, there are some things we need to do, tweak system settings, execute some processes, however even on Ubuntu, sometimes there isn't a GUI to perform such tasks, which is why we come to ...
21
votes
2answers
9k views

How do file permissions work?

Can you explain briefly the main concepts and command line tools used to manage file permissions?
37
votes
4answers
67k views

Where to declare environment variables?

What are correct places for: Global environment variables meant to affect all users? User-specific environment variables?
60
votes
4answers
60k views

How can I shorten my command line (bash) prompt?

Currently it is: michael@Castle2012-Ubuntu-laptop01:~/Dropnot/webs/rails_v3/linker/spec/controllers$ Outside of renaming my machine and directory structure... How could I make it be something ...
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 ...
161
votes
4answers
216k views

What do the different colors mean in the terminal?

What do the different colours in Ubuntu's terminal mean? For example, when I type the ls command in one of my folders, I get one of the files in light green, the other (which is a folder) in blue with ...
49
votes
6answers
216k views

How do I connect to a WPA wifi network using the command line?

So basically, I'd like to use iwconfig to connect to my wifi network when I'm not inside X. But I just don't see a way to do it in the man page. Any idea?
207
votes
11answers
240k views

How can I suspend/hibernate from command line?

How can I suspend or hibernate my laptop using command line, without installing additional software?
16
votes
3answers
60k views

How do I enable the “Universe” repository from the command line?

How do you use terminal to enable Universe source? Or any those 4 from Software Sources: Main, Universe, Restricted, Multiverse Main is on by default and Restricted is on if durring Ubuntu ...
95
votes
11answers
61k views

How can I set default terminal used in Unity?

How can I set the default terminal used in Unity? I would like to use the Ctrl+Alt+T hotkey to start a non-default terminal. The default terminal is gnome-terminal. Where can I change the default ...
59
votes
8answers
68k views

How to easily rename files using command line?

One of the ways I quickly rename files in Windows is F2 > Rename > Tab (to next file) > Rename ... But in Ubuntu/Nautilus, I can't tab to next file. But being on Linux, I think there must ...
139
votes
16answers
195k views

How to check battery status using terminal?

I would like a command that check the battery status through the terminal
86
votes
12answers
130k views

System Monitoring Tools For Ubuntu

I am looking for System Monitoring tools which are GUI and Cli or Web Based which include Basic Functions such as CPU Usage Ram Usage Swap Usage Disk Usage ( Space / I/O ) Heat Monitoring I know ...
154
votes
14answers
329k views

How can you log out via the terminal?

Is there a command, that will take you back to the login screen?
36
votes
4answers
226k views

How to edit files in a terminal with nano?

Sometimes, a graphical text editor like gedit or kate cannot be used (because you're in a virtual console for example). Luckily, there are text editors for the terminal. An easy one is nano, but I ...
11
votes
4answers
3k views

How can I start up an application with a pre-defined window size and position?

I'm wondering is there any way to achieve the affect of the Ctrl-Alt-Keypad shortcuts in Unity using terminal commands instead? I want a command that sets a gui window to half the size of the screen, ...
158
votes
12answers
178k views

Progress and speed with 'cp'?

When copying files using cp, is it possible to display the progress and speed of the transfer? Otherwise, is there any alternative command line utility that can achieve this?
27
votes
2answers
32k views

What is a tty, and how do I access a tty?

I keep hearing about these things known as tty's. what are they how can I access them what do they do?
1
vote
2answers
3k views

How to run xrandr commands at startup in Ubuntu

How can I run the following xrandrcommand on startup? xrandr cvt 1368 768 xrandr --newmode "1368x768_60.00" 85.25 1368 1440 1576 1784 768 771 781 798 -hsync +vsync xrandr --addmode VGA1 ...
75
votes
3answers
217k views

How do I use variables in a sed command?

I tried the following code and it doesn't do what I want: var1=QQ sed -i 's/$var1/ZZ/g' $file However, this code replaces QQ with ZZ: sed -i 's/QQ/ZZ/g' $file How do I use variables in sed?
47
votes
3answers
26k views

What do the various dpkg flags like 'ii' 'rc' mean?

I frequently need to check which packages are installed, and I use the following command: dpkg -l | grep foo which gives the following output Desired=Unknown/Install/Remove/Purge/Hold | Status=Not/...
34
votes
2answers
84k views

How do I change mirrors in Ubuntu Server from regional to main?

I have a Lucid Server (10.04) set up and I would like to change the mirror from US (or any other country) to the Main Ubuntu Mirror. For example my two first entries in sources.list are: deb http://...
27
votes
6answers
50k views

How to run a script without closing the terminal?

I have a script in file bla.sh and it is executable. When I click on it, the script is executed and the window is closed. I'd like the window to stay open. Something like command cmd /k** command in ...
530
votes
7answers
1.7m views

How to unzip a zip file from the Terminal?

Just downloaded a .zip file from the internet. I want to use the terminal to unzip the file. What is the correct way to do this?
111
votes
6answers
474k views

How to access a usb flash drive from the terminal? (How can I mount a flash drive manually?)

I only have access to the command line I need to backup my data (on the user folder) to a pen. I don't know where/how can I do this is order to access the pen, and then do the cp command. How can ...
55
votes
8answers
50k views

How to clean launch a GUI app via the Terminal (so it doesn't wait for termination)?

Some GUI apps launch cleanly via the Terminal command line. Some don't, and they cause the Terminal to wait for the app to terminate. ...and even then, some don't "release" the command line. The ...
38
votes
2answers
81k views

connect to wifi from command line

Other posts seems to be addressing more complicated network connection issues from the command line. The Unity panel Network indicator/button doesn't respond too well sometimes - it keeps trying to ...
44
votes
5answers
71k views

Can I install extra drivers via the command prompt?

Since I can't seem to open the Additional Drivers program? And how do I know what driver I need to install?