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

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26 views

How to modify ENV in Solaris 10 [duplicate]

I wanted to edit the contents of environment when entering this "ENV" in terminal. I googled this but so far none of the solution offered works in my end. The closes solution that i got was to edit ...
105
votes
27answers
26k views

Tracking down where disk space has gone on Linux?

When administering Linux systems I often find myself struggling to track down the culprit after a partition goes full. I normally use du / | sort -nr but on a large filesystem this takes a long time ...
4
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3answers
404 views

Switching among cli and vim and other files workflow

I saw some kind of workflow in vim: Vim had a file open. Then some combination of keys made vim disappear and the user was in the command line working in cli mode, then opened another file and then ...
6
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1answer
244 views

Echo difference between Ubuntu and Red Hat

I have mostly been experimenting with Ubuntu but recently was using a Red Hat Enterprise system and was surprised at a difference I found setting and displaying environment variables. In Ubuntu I ...
0
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1answer
363 views

How to get sound intensity of an audio input through terminal?

I want to know the intensity of the sound being heard by an audio in source like a mic or Line-in through Command line. Kinda like the progressbar under the mouse but in CLI. audiointensity mic0 10 ...
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2answers
57 views

How to identify user and server with short commands?

I've been teaching my students the basics of the Unix OS (and Linux) for 4 weeks now. I want to give them a home assignment next. It's the first one so the questions and tasks won't be hard. My only ...
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0answers
37 views

How to get mpd to recognize music library?

I have arch running on my desktop and I'm trying to play music with mpd using ncmpcpp. They are both up and running, but the problem is when I open ncmpcpp it doesn't show my music. I copied the music ...
13
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3answers
5k views

Break a large file into smaller pieces

How do I break a large, +4GB file into smaller files of about 500MB each. And how do I re-assemble them again to get the original file?
0
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1answer
57 views

How to determine Apache user from the command-line?

There is a question about the group, but I couldn't find any question/answer for getting the Apache user. Therefore how to determine Apache user from the command-line?
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2answers
61 views

Print UTF-8 file with command line tools

I want to print a file using a command like cat filename > /dev/lp0 where the file contains characters like ùàç encoded in UTF-8. Is this is possible or do I need to use CUPS? I'm using an ...
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2answers
39 views

Outputting common lines from 2 files and uncommon lines from both the files in one output file

I have 2 text files. Lets name them file1.txt and file2.txt file1.txt is as follows chr10 181144 225933 chr10 181243 225933 chr10 181500 225933 chr10 226069 255828 chr10 255989 267134 ...
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7answers
796 views

What is the easiest way to add a string on the beginning of every line of the file from the command line?

I am looking for a way to add some string to the beginning of every line (same string for every line). Not something customizable but rather something that will be easy to remember and available on ...
5
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3answers
2k views

Easy way to paste command line output to paste bin services?

Are there any command line tools on Linux that allow you to post output from commands or text files directly to a sharing service such as pastebin.com?
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9answers
2k views

How to generate a year-quarter date from the command line?

I'm interested in outputting a representation of the current year-quarter, as well as the year-quarter for the previous month. If today is 2012 January 1st, I'd like to get 2012q1 and 2011q4 as ...
44
votes
5answers
2k views

cd by just typing the directory's name?

I either had this somewhere 20 years ago or I dreamed about it. Basically: If if type blobblob I get blobblob: command not found Fair enough. I would like it so that when my shell gets those ...
1
vote
2answers
69 views

How to kill all processes for a given user that take longer then X time

When I list processes with ps auxf I often see some that are stuck and I need to manually kill them. How can I do it with one command? Example ps result: $ ps auxf USER PID %CPU %MEM VSZ ...
2
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0answers
22 views

Close All Piped Commands if one close

I'm running at least 3 commands (with progs) using pipes. For example program1 bla bla | program2 blabla | program3 bla bla Is possible to close all programX PIDS automatically if at least one ...
1
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2answers
680 views

What is the difference between the whatis and apropos commands?

CentOS 6.3 / RHEL 6.3 Can someone please explain the difference between the whatis command and the apropos command? I noticed that both appear to be installed by default and I'm not sure what the ...
37
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3answers
44k views

ssh-add complains: Could not open a connection to your authentication agent

I've been trying to get ssh-add working on a RaspberryPi running Raspbian. I can start ssh-agent, when I do it gives the following output into the terminal: ...
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1answer
44 views

Is autocompletion for applications done by shell?

When I type evince, and then hit tab, the bash shell will list all files that can be opened by evince, which seems to be based on the ext part of the filename. Is this done by shell or the ...
2
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2answers
59 views

Use awk to find first occurrence

I have a log file that gets updated when my script runs. The script will insert "Start of script" text when it starts and "End of script" text when it finishes running. I am trying to capture the ...
5
votes
7answers
715 views

Linux command line. Move all files and directories in directory, except some files and directories

I have a folder A which has files and directories, I want to move all those files and directories to another folder B, except file, file2, directory, and directory2. How can this be done?
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0answers
29 views

What does !$ mean exactly? [duplicate]

echo !$ outputs different strings depending on my previous command line call. For example: mrdumbdumb-redhat:~ mrdumbdumb$ ls mrdumbdumb-redhat:~ mrdumbdumb$ echo !$ echo ls ls ...
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1answer
642 views

How to get byobu to start at startup with a command executed, as root?

I want when the computer start, a byobu session is started and a command executed in the first window (windows 0), without requiring any user intervention. It is very important that this doesn't ...
2
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4answers
154 views

How to display the number of lines, words and characters in separate lines?

I want to display the number of lines, words and characters, in a file, in separate lines? I don't know anymore than using wc filename for this.
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4answers
3k views

How to use ifconfig to show active interface only

By default ifconfig will show me all available interfaces , but what if I just want to display active ones? Like, en0 only in below. en0: ...
3
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2answers
105 views

get result text from CLI command

I'm writing a bash script and I need to capture the text resulting from the output of the rsync command, for instance, the following command: rsync -av "$FOLDER1" "$FOLDER2" prints: ... sent ...
7
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1answer
361 views

Is there a way to make perl -i not clobber symlinks?

A friend of mine points out that if you do: perl -pi.bak -e 's/foo/bar/' somefile when "somefile" is actually a symlink, perl does just what the docs say it will do: It does this by renaming ...
8
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7answers
10k views

How do I install a PHP CLI with a usable interactive prompt on Debian Wheezy?

When I install php5-cli on Debian Wheezy (currently testing), the interactive prompt is very unusable due to missing readline support (bug 341868). What's the easiest way to install a version linked ...
2
votes
2answers
42 views

How to make an infinitely executing command kill itself when certain conditions are met?

I'm running a command on command line which infinitely generates a certain data and I'm looking for a particular bit of data, so I used grep to find it. As soon as I get the data, I want the command ...
32
votes
4answers
2k views

Reverse grepping

Let's say, I have a really big text file (about 10.000.000 lines). I need to grep it from the end and save result to a file. What's the most efficient way to accomplish task?
1
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1answer
84 views

How do I Nohup an interactive shell-script?

My Script is having 2 command-line arguments and then just couple of questions, after these questions the script will run for itself, I'm able to pass the command-line argument by just doing, ...
2
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3answers
96 views

Standard and portable way to send email from console?

What is the most portable or standard way to send an email from the console or a script on Linux, and possibly Unix?
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3answers
188 views

Execute a file if a command is not found

When I try to execute files in Linux, I'm always annoyed by the need to write ./executablefile instead of just executablefile. I get why it's done, so it won't have an ambigous input, one that is a ...
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0answers
50 views

How to connect tata photon in X window manager in ubuntu 14.04 using command line

Due to some reason I had to shift from Gnome to X(basic X). So here on the desktop nothing appears (no launcher, no menu bar, nothing) but we can open command line in it using Ctrl+Alt+Tab. (I have ...
14
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4answers
22k views

How to stop a background process?

I have started a wget on remote machine in background using &. Suddenly it stops downloading. I want to stop its process, then start it again. How can I stop it? I haven't close its shell window. ...
0
votes
1answer
27 views

Command line utility to learn bit twiddling hacks

I am currently reading Hacker's Delight and would like to practice as I read through the book. Is there any command line *nix tool to perform binary operations and see output in binary?
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3answers
72 views

What is the concept hidden behind the term “command”?

I have been using, studying and developing for Linux for quite a few years now, and over time, I have successfully convinced a few people to join the cause, and make the switch to Linux. However, ...
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vote
4answers
391 views

Why do we use double hyphen in “tar --anchored” and single hyphen in “tar -b”? [duplicate]

Why do we use double hyphen in tar --anchored and single hyphen in tar -b? I mean to say why some command line options have single hyphen (-) while some others have double (--)? Also a git example: ...
6
votes
2answers
1k views

How to replace a symbolic link with a copy of a file it links to?

Having a (single, no batch filesystem processing needed) symlink, what a command line to use to replace it with a copy of the file it links to?
61
votes
24answers
9k views

Quick directory navigation in the terminal

I would like to frequently switch between directories that are in totally unrelated paths, for example /Project/Warnest/docs/ and ~/Dropbox/Projects/ds/test/. But I don't want to type cd ...
2
votes
4answers
138 views

How to disable a shell keyword?

Using enable builtin command we can disable a shell builtin command, for example echo, as follow: enable -n echo But how can we disable a shell keyword like time? If we try: enable -n time we ...
1
vote
1answer
63 views

Apply recursive chmod to files or folders only

I'd like to apply chmods to files and folders in one line, Basically: chmod 700 ./* -R # but only apply to folders chmod 600 ./* -R # but only apply to files Of course I searched google and read ...
4
votes
3answers
501 views

How to disable beep sound in Linux CentOS 7 command line? [duplicate]

I just installed the basic Linux CentOS 7 (no desktop) and am experimenting with the system. Every time I make a mistake (entering things that the command line doesn't like), the computer beeps and ...
2
votes
1answer
74 views

How to sort files based on the json property value inside the file?

I've downloaded list of videos via youtube-dl and each file has corresponding .json file containing certain properties. So I would like to sort the files based on the selected json property which is ...
47
votes
10answers
19k views

how do you sort du output by size?

How do you sort du -sh /dir/* by size? I read one site that said use | sort -n but that's obviously not right. Here's an example that is wrong. [~]# du -sh /var/* | sort -n 0 /var/mail 1.2M ...
1
vote
1answer
39 views

how to detect video completion in vlc

Vlc provide documents in which there are lots of command are given to control vlc from command line. Here is the link of documentation. Now in my task, I need to run a video in a loop, for this I am ...
0
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0answers
5 views

Is there a way to scan all configured maven repos for a a package?

Lets say I am writing code and I decided I want a certain package, but I don't know rather the repos I have setup have that package, or which version of the package they may have. Is there a quick ...
23
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8answers
7k 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 .
1
vote
3answers
118 views

How to do command-line completion with files and folders

As a new Linux user, one of the things that's kept me away from the Command Line (CL) is that, for tasks involving files and folders (i.e. everything!), the amount of typing involved makes using the ...