The command-line is the interactive interface to your shell.

learn more… | top users | synonyms (1)

15
votes
5answers
7k views

How to shut down the computer after a task has been completed?

I usually start a download before I go to school. Which command should I use to automatically make the necessary saves and turn off the computer after a particular task has been completed? (Say, ...
31
votes
4answers
78k views

Why do we use “./” to execute a file?

Why do we use ./filename to execute a file in linux? Why not just enter it like other commands gcc, ls etc...
24
votes
5answers
12k views

What is the difference between ls and l?

I accidentally typed l instead of ls today and found that the command still printed a list of the files in my current directory. Trying l --help brings up the help file for ls suggesting that l is ...
2
votes
6answers
3k views

truncating file names

I have a folder that has a number of files all of a similar form as: Dropkick Murphys - 01 - Walk Away.mp3 Dropkick Murphys - 02 - Workers Song.mp3 And so forth... I want to convert them all so ...
10
votes
2answers
2k views

Change directory without typing cd?

Is it possible to make bash change directory in command line simply by typing that directory without any commands like cd? For example is it possible instead of writing this: $ cd /tmp I just want ...
7
votes
2answers
4k views

sort output by column

I'd like to take this command find -maxdepth 1 -type d | while read -r dir; do printf "%s:\t" "$dir"; find "$dir" | wc -l; done ( from here ). which has an output of basically ./kennel: 11062 ...
57
votes
15answers
34k views

Markdown Viewer

I found a file formatted with Markdown. Could you guys suggest what viewer that I could use to view this type of files? Hopefully one without gui (if it's possible) Update I was actually looking for ...
2
votes
4answers
282 views

How can I manipulate the content of a file, by duplicating and changing some parts?

I want to manipulate a text-file. It contains many blocks of the form CLASS ...some stuff ... END I want to duplicate each of these blocks and add and remove a line of it's content. Can I script ...
20
votes
6answers
4k views

put history command onto command line without executing it

I use !n where (n) is the line number for executing a line in the history file I want executed at the command prompt which I find via history|less. But there is a command line history event I wish ...
127
votes
7answers
106k views

How can I close a terminal without killing the command running in it?

Sometimes I want to start a process and forget about it. If I start it from the command line, like this: redshift I can't close the terminal, or it will kill the process. Can I run a command in ...
11
votes
5answers
1k views

Is there a good combination of command-line and graphical file browser?

Is there a feasible solution than combines the advantages of a command-line and a graphical file browser? For example, the command-line is good to change the directory and execute commands but can't ...
9
votes
2answers
7k views

How can I install ncdu on Red Hat?

The answers provided to this question doesn't help. I'ved tried yum install ncdu But I'm getting No package ncdu available
8
votes
4answers
14k views

How to install software on Red Hat?

What's the simplest way to download/install software on Red Hat Linux (from bash command line)?
35
votes
10answers
23k views

How to understand what's taking up space?

I'm looking for a linux alternative to WinDirStat. I would like to know what is taking up space on my hard drives. A program that works on console and doesn't require a UI is preferred .
4
votes
1answer
616 views

Quick way to host a webserver on localhost

I'd like to make the contents of a folder available at http://localhost:PORT/, temporarily. A very basic http server. I already know about, $ python -m SimpleHttpServer or ( this seems like the ...
27
votes
5answers
7k views

How do I send stdin to the clipboard?

Is there functionality in unix that allows for the following: echo "Some Text" | copy-to-clipboard
2
votes
1answer
189 views

How do I view files as a tree structure?

I would like to view files exactly like I can view proccess using pstree. So is there something like: treeview --maxdepth 2 that would give me what I need?
1
vote
1answer
545 views

CH3MNAS Fun Plug and NZBget. Cannot launch NzbGet 0.7, word unexpected

I have un-tarred the nzbget0.70 debug version and have put it in the /ffp/bin dir. and I have a config file in the /ffp/etc/ dir but when I try to run it, I get the following: ...
21
votes
5answers
40k views

How can I make a program executable from everywhere

What should I do if I want to be able to run a given program regardless of my current directory? Should I create a symbolic link to the program in the /bin folder?
4
votes
1answer
116 views

What is this construct in bash? mycommand(){dosomething;}

I actually found following one-liner on commandfu.com: cmdfu(){ curl "http://www.commandlinefu.com/commands/matching/$@/$(echo -n $@ | openssl base64)/plaintext"; } I have not come across a similar ...
44
votes
4answers
44k views

Understanding the exclamation mark (!) in bash

I used history | less to get the lines of previous commands and from the numbers on the left hand side I found the line I wanted repeated (eg. 22) and did !22 at the command prompt and it ...
3
votes
2answers
472 views

I need help with a cronjob to watch for runaway processes and kill them

I have an interesting situation, I have a runaway ruby process - I know exactly how I trigger it. Point is, it got me thinking about runaway processes (CPU usage or memory usage). How would one ...
6
votes
3answers
1k views

Deleting lots of files

I accidentally created 8 million files and every time I'm trying to delete them the server almost dies because of the rm process eating all disk IO (the server is remote without console). Should ...
35
votes
4answers
52k views
3
votes
2answers
1k views

Difference between wget versions

I have problem with wget behavior for 1.10 and later versions. I am using wget to download a report from my app. version 1.10.2: >wget-1.10.2.exe --http-user=trader --http-passwd=trader ...
2
votes
1answer
121 views

How can I create a file that just contains a binary number?

I would like to create a file that just contains a binary number. I think that touch can be used to create an empty file, but is there any way I can fill it with a binary number e.g. 10 (ten)? And how ...
2
votes
1answer
2k views

How can I check the Base64 value for an integer?

I would like to check the Base64 value for an integer. There is a base64 linux command but I don't understand how I can apply it on integers. I have tried with base64 10 but then I get the error ...
5
votes
4answers
243 views

How could I simplify this command to only use awk?

awk '/user/ {print $1 }' /etc/userdomains | sed 's/://' the format of /etc/userdomains is domain.tld: user otherdomain.tld: otheruser
8
votes
3answers
2k views

How do I take a list and remove it from a file?

I have a long list of domain names that I need to remove from /etc/remotedomains. They're probably not in any particular order in the file. Each domain is on one line. How could I iterate through the ...
21
votes
4answers
39k views

Grabbing the first [x] characters for a string from a pipe

If I have really long output from a command (single line) but I know I only want the first [x] (let's say 8) characters of the output, what's the easiest way to get that? There aren't any delimiters.
3
votes
1answer
7k views

How to increase the TTY fontsize?

I have a fedora machine, I am used to working on CLI since I had CRT monitor, after switching to TFT - the experience is not the same I had with CRT, the font is smaller now. How to change it?
8
votes
5answers
10k views

Modifying PDF files

I need to do some basic editing on existing PDF file. I.e. I need to: Add chapters/bookmarks Change some page numbering However I cannot find any tool - GUI or commandline - which would offer this ...
1
vote
1answer
1k views

vnc connection working with PuTTY but not with command line

I am using PuTTY to connect to a distant network to then set up x11vnc and then using ssl/sshvnc as a client. in the host name for PuTTY I have: ssh.inf.uk and port: 22 in the ssh tunnel options I ...
3
votes
6answers
663 views

How do I find a command if I don't know its name?

As a Unix beginner, I often find myself wanting to know the name of the command that achieves a particular function I'm after. How can I go about finding out the name of the command, given a ...
5
votes
1answer
1k views

How to get a persistent “history”-file even after a non-clean shutdown?

I am trying Ubuntu Server 10.10 in VirtualBox. I like that the commands I run is saved in a "history"-file that can be shown with the history command. But if I just turn off VirtualBox without the ...
3
votes
1answer
2k views

Montage together five gifs

I have five gifs all with the same number of frames and the same framerate. Is it possible to montage these together into one gif where each frame is similar to a normal montage of static images and ...
7
votes
6answers
1k views

How can I reproduce commands run on one machine on another machine?

I would like to install some software on a linux-machine that I have run in VirtualBox. Then I would like to do the same thing on a linux-VPS. I think that I can save all commands that I run using ...
15
votes
7answers
17k views

grep and tail -f?

Is it possible to do a tail -f (or similar) on a file, and grep it at the same time? I wouldn't mind other commands just looking for that kind of behavior.
1
vote
1answer
2k views

What strings should I look for in /var/log/auth.log?

I wrote a bash command to scan /var/log/auth.log for messages occurring on the current day indicating unauthorised access. Currently it just fetches messages matching BREAK-IN and unauthorized. What ...
10
votes
5answers
21k views

how do I add newlines between lines printed on the command line?

Mail logs are incredibly difficult to read... how could I ouput a blank line between each line printed on the command line. For example say, i'm grep-ing the log. That way multiple wrapped lines ...
20
votes
7answers
4k views

Command-line-friendly full-text indexing?

Is there such a thing as a full-text indexing engine, that can be queried from the command line and ideally wouldn't require using a gui at all ? I'm especially interested in indexing my ebooks and ...
10
votes
2answers
19k views

What does ^d mean in ls -l | grep ^d?

When I do ls -l | grep ^d it lists only directories in the current directory. What I'd like to know is what does the caret ^ in ^d mean?
32
votes
5answers
10k views

How to echo a bang!

I tried to create a script by echo'ing the contents into a file, instead of opening it with a editor echo -e "#!/bin/bash \n /usr/bin/command args" > .scripts/command The output: bash: ...
5
votes
1answer
771 views

How to use the ul command line utility

I wanted to answer http://unix.stackexchange.com/questions/3043/use-roff-to-underline-words with "just use ul, this command is meant specifically for underlining text", however I just can't grasp how ...
1
vote
2answers
868 views

How can I shutdown after unmounting a USB device from the command line?

Previously, I asked this question about how to suspend Linux after a set amount of time. I would like to ask a similar question. Supposing I have a USB device attached to my system (OS = Fedora 13), ...
58
votes
11answers
66k views

How do I convert an epoch timestamp to a human readable format on the cli?

How do I convert an epoch timestamp to a human readable format on the cli? I think there's a way to do it with date but the syntax eludes me (other ways welcome).
5
votes
2answers
4k views

Is there a way to empty the trash/wastebasket from the command line?

This would be great especially considering the latest version of Ubuntu is very slow when displaying directories on my PC...
13
votes
3answers
6k views

Sunrise and other astronomical data from the command line

Is there a simple open-source, command-line program that can show the sunrise and sunset times at a given date and location, and perhaps moon and planet data as well? Browsing the Debian package ...
8
votes
2answers
5k views

Show a notification across all running X displays

Using the command line, I'd like show a notification on every running X display. ( and running console ) Something like: notify-send-all 'Warning' 'Nuclear launch in 5 minutes, please evacuate' Is ...
39
votes
1answer
33k views

What is the difference between modify and change in stat command context?

The stat command's manual page says: %x Time of last access %y Time of last modification %z Time of last change I am unable to understand what is the difference between ...