A terminal is an environment for text input/output. Inside the terminal, one runs command-line and text mode programs (including shells).

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How to append multiple lines to a file with bash

I am writing a bash script to look for a file if it doesn't exist then create it and append this to it: Host localhost ForwardAgent yes So "line then new line 'tab' then text" I think its a ...
77
votes
4answers
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What is the point of Ctrl-S?

Ctrl+S stops all output to the terminal which can be restarted with Ctrl+Q. But, why does Ctrl+S exist in the first place? What problem was trying to be solved by putting that control sequence in ...
52
votes
4answers
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How to recover a 'lost' screen session?

Somehow I managed to close a screen window without screen 'noticing' it, so the session is still flagged as attached. This prevents me from re-attaching to this session. What can I do? me@iupr-serv8:~...
40
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3answers
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What are pseudo terminals (pty/tty)?

This might be really basic question but I want to understand it thoroughly. What is a pseudo terminal? (tty/pty) Why do we need them? How they got introduced and what was the need for it? Are they ...
30
votes
2answers
107k views

Sending messages to another user

Is there any command to send messages through the Linux shell to other people on the same network? I'm using write user and then write the message itself. But there's any command that doesn't show my ...
24
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6answers
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Using VI keys to edit shell commands in UNIX

I used to have a co-worker who was really good at UNIX. He showed me how to use Vi key bindings to edit my shell commands. He placed the command in a file that ran every time I logged in. Since ...
20
votes
6answers
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How can I hook on to one terminal's output from another terminal?

I need to hook onto output of currently running terminal (tty1) from virtual terminal and capture it (running X server). I'm pretty sure such a thing is possible by simpler means than debugging (...
27
votes
7answers
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Converting colored output into html

There are tools providing coloured output: dwdiff -c File1 File2 # word level diff grep --color=always # we all know this guy ... The question is: How to convert their colored output of arbitrary ...
16
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2answers
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Can the empty spaces/background in a terminal be replaced with a random(but pretty) pattern of ASCII characters?

Context and Question There are many ways to colorize the terminal and shell environment. The output of individual commands, such as ls and grep, can also be colorized. Not directly related but ...
25
votes
9answers
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How can I set my default shell to start up tmux

I would like my default bash shell to go straight into tmux instead of my always having to type tmux every time.
19
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9answers
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How to make sure that a command is not interrupted, even if terminal is closed? [duplicate]

In Linux. Say I want to run a command and it takes too long. I just want to ensure it's done. How?
17
votes
5answers
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Is there a way to lock command line?

For example, in X session, I can use Ctrl-Alt-L to lock the screen, so it would ask for password to unlock and prevent somebody from messing with mine computer. But if I have an open terminal session ...
14
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2answers
3k views

Concept of controlling terminal in Unix

Can some one please explain in an easy to understand way the concept of controlling terminal in unix and unix like systems ? Is it related to a session ? If yes, then how ?
31
votes
3answers
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Which terminal type am I using?

I have tested this with both Ubuntu 12.04 and Debian 7. When I do echo $TERM I get xterm But if I use the dropdown menu "help" > "about" then it says gnome terminal 3.4.1.1. Does this mean I am ...
27
votes
2answers
10k views

How do I start all shell sessions in a directory other than $HOME?

When I open my non-login shell in Ubuntu, my present working directory is /home/user_name (my $HOME environment variable), but I want to change this such that when I start my terminal I am in some ...
8
votes
2answers
20k views

Sending function keys (F1-F12) over SSH

I have a Fedora machine that I can SSH to. One of the programs I'd like to use occasionally uses the function keys. The problem is that I'm SSH'ing from an Android tablet (ASUS Transformer Infinity) ...
6
votes
2answers
6k views

xterm colors are too bright

I've just started using dwm a couple days ago and I'm using xterm (uxterm) as a terminal emulator. However, I'm noticing that certain applications (like vi/vim, ls, and others) that output in color ...
17
votes
6answers
2k views

Is there a terminal app that allows filenames to be clickable?

Is there a terminal emulator (extension or app) that does link resolution for local paths? In particular when I see things like: /home/sam/.gem/ruby/1.8/gems/actionpack-2.3.2/lib/action_controller/...
16
votes
2answers
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How do I leave a message for another (local) user?

I know you can use write to send a message to a currently logged in user, but how do you leave a message for a user who is not logged in? The solution I have seen is modify the motd, but that will be ...
16
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2answers
1k views

What does CTRL+4 (and CTRL+\) do in bash?

I just found out by accident that CTRL + 4 closes programs reading stdin input from the command-line. This is how it looks when I type CTRL + 4 or CTRL + / into programs reading stdin ryvnf:~$ ...
12
votes
12answers
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How do I run the same linux command in more than one tab/shell simultaneously?

Is there any tool/command in Linux that I can use to run a command in more than one tab simultaneously? I want to run the same command: ./myprog argument1 argument2 simultaneously in more than one ...
9
votes
2answers
9k views

How to change the width of remote serial console?

I followed this tutorial and now I'm able to connect to serial line. Now I want to change the width of terminal. How can I do this by using screen or minicom or something else?
9
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1answer
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How to launch an application with default “terminal emulator” on Ubuntu?

I wanted to execute some command in terminal emulator, like Konsole, but I need to make this cross-desktop. Is there some command like xdg-open, but for getting the default terminal emulator? I'm ...
4
votes
1answer
2k views

Waching YouTube videos in bash sessions, in ASCII mode

I already found how to watch YouTube videos in terminal, in ASCII mode, but my goal is to watch them in a bash session, without opening a different window. So, supposing I already have a tmux ...
13
votes
1answer
10k views

How to set the bash display to not show the vim text after exit?

My question is simple, but I am finding it hard to frame/explain it easily. I log into several Unix boxes with different accounts. I see 2 different things for user1 and user2, while editing text ...
12
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5answers
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How to recall a previous command (without execution) in order to change it?

I can't remember the trick where I could get the last command without running it: let's say I want to be be able to access the command !1255 when pressing the up arrow key and modify the command. So ...
10
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3answers
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Are there any linux terminals which can handle all key combinations?

I like to use emacs in terminal mode (-nw), but it seems most (all?) terminals can't handle some key combinations - for example, C-<RET> or C-M-%. I know this is because most terminals emulate a ...
8
votes
5answers
11k views

Fix terminal title after SSH remote logging to another machine

right now I am using an one-line perl code to change titles of my terminal bars, print("\e]0;@ARGV\7"); but every time after I ssh to another remote machine, the title will be modified by the host (...
8
votes
1answer
9k views

Save all the terminal output to a file

Is there some way of saving all the terminal output to a file with a command? I'm not talking about redirection command > file.txt Not the history history > file.txt, I need the full terminal ...
7
votes
1answer
2k views

combining find with other commands: when to use -exec and when to use pipe? [duplicate]

I've learned to use the find command by itself to find files and directories however when it comes to doing something with the files/folders I'm confused. Given the following command: find . -type f ...
7
votes
4answers
2k views

How to merge two files with different number of rows in shell?

I have file1 like this: CHR SNP TEST A1 A2 GENO O(HET) E(HET) P 0 AFFX-SNP-000541 ALL 0 0 0/0/0 ...
14
votes
7answers
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Unable to stop a bash script with Ctrl+C

I wrote a simple bash script with a loop for printing the date and ping to a remote machine: #!/bin/bash while true; do # *** DATE: Thu Sep 17 10:17:50 CEST 2015 *** echo -e "\n*** DATE:"...
12
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3answers
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What are the characters printed when Alt+Arrow keys are pressed?

When I press AltUp, A printed to terminal screen. Same thing happened when I pressed AltDown but B is printed instead. Other characters that I realized; AltLeft = D and AltRight = C What is the ...
12
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2answers
3k views

Alt-Left to skip words does not work in terminal emulators

On a Debian Wheezy machine at previous job, I got used to Alt+Left and Alt+Right to skip between words on active command-line (in bash). However, since at home I have upgraded to Jessie (Debian 8.0, ...
7
votes
2answers
2k views

How to draw a single pixel in a terminal?

Until now I used characters to draw images, shapes etc in a terminal. Is it possible to draw a single pixel? Let's say: foo 1 1 red This will draw a red pixel at the coordinate (1, 1). Is there ...
7
votes
4answers
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Parallel execution of a program on multiple files

I have a small script that loops through all files of a folder and executes a (usually long lasting) command. Basically it's for file in ./folder/*; do ./bin/myProgram $file > ./done/$file ...
6
votes
2answers
1k views

tmux: shared session, one user in a pane, another in another pane, two different cursors

I've decided to try tmux: have been reading the docs and googling around, trying to find a way to have two users sharing a session, each with a different cursor. However, giving 777 permissions to ...
6
votes
2answers
1k views

Is it possible to transfer a running process to your terminal? [duplicate]

Possible Duplicate: How can I pause up a running process over ssh, disown it, associate it to a new screen shell and unpause it? It is fairly easy to disown a process, or make it run without a ...
6
votes
3answers
962 views

Terminal change keys

Is it possible in the Unix terminal to change some of the keyboard keys? For example: when I press , then _ gets printed? If this is indeed possible, how do I go about doing that? I'm on Ubuntu.
6
votes
2answers
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How to properly run “top” command through SSH?

I have to run top command on one computer being on another. My targeted PC has IP 192.168.0.81 I was trying to do it: ssh 192.168.0.81 top But I got this result: top: tcgetattr() failed: Invalid ...
6
votes
1answer
2k views

How to configure screen-restore in a terminal?

Depending on the terminal/environment following sequence has different effects: $ ls 1 2 $ man ls enter q Either I see last displayed man-page screen above the current prompt or the ls output and ...
5
votes
1answer
3k views

Mosh: Retain backscroll beyond terminal window height [duplicate]

I'm experimenting using Mosh instead of raw SSH for remote shell connections. So far I like it, but I've become used to being able to page-up or scroll through backscroll in my terminal window to see ...
4
votes
2answers
2k views

How to change the cursor theme in CLI?

I want to change the cursor to be block-shaped. All applications (nano,vi,vim,…) should should have a square-style cursor like the picture above.
4
votes
2answers
4k views

Scrolling through ls output without a mouse

In some directories there are quite a few files. When I use ls the output is more than my terminal can handle. Typically I just use one of the following: ls | less ls | more depending on my mood. ...
4
votes
2answers
5k views

Horizontal Scrolling in Terminal

So there are I believe 2 questions on this already. All of them to do with tail -f and hence people give the tangent answer of "use less". I need it for everything, every command, etc. The problem ...
3
votes
2answers
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Is it correct to set the $TERM variable manually?

I set the $TERM variable adding the line XTerm*termName: xterm-256color to my .Xresources file. When I did it I didn't know what exactly that meant (I was following an online guide to change the look ...
3
votes
2answers
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change terminal title

I want to make a shell alias that starts a certain program and also changes the title of the terminal to the name of the program. How can I do that? In case it matters, I am running the terminal on ...
2
votes
1answer
300 views

To write this Pseudocode with Regex

I am doing a Makefile which I run regularly by Crontab every day at 0230 crontab -e; 30 2 * * * /bin/thePseudocode Python-like Pseudocode directories = ["Cardiology", "Rheumatology", "Surgery"] ...
1
vote
1answer
2k views

Echo/Printing text in the color of a given hex code (regardless of Xresources/Xdefaults)

is there any way to echo/print text in the color of a given hex code (#000000, #FFFFFF, etc.) regardless of one's own Xresources/Xdefaults color definitions? Like, if Bob had in his Xresources/...
14
votes
2answers
828 views

Colored output?

When I execute a command from a terminal that prints coloured output (such as ls or gcc), the coloured output is printed. From my understanding, the process is actually outputting ANSI escape codes, ...