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

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2
votes
4answers
114 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
27 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
245 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
16 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
17k 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
3answers
63 views

Pulling Lines X-Y From List of Files Found

Ultimately I need to grab lines 3-53 from ever csv in each subdirectory. I grabbed the lines like so (cat isn't necessarily required): cat /[path]/[file].csv | head -53 | tail -51 And the files ...
1
vote
1answer
27 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
votes
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 ...
1
vote
4answers
361 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: ...
22
votes
8answers
6k 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
0answers
30 views
+50

How to write/edit/update the OsIndications efi variable from command line?

In the need to enter the UEFI firmware setup utility while using ultra fast boot (keyboard drivers are not loaded during POST), I wish to write to the "Os Indications" efi variable. My OS is Ubuntu ...
1
vote
3answers
97 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 ...
3
votes
1answer
65 views

Set Ubuntu System Proxy Settings without Restart from commandline

I am using Ubuntu 14.04 . I want to change the http proxy settings from the command line. This should be equivalent to changing in the GUI(All Settings->Network->Network Proxy) and clicking the button ...
4
votes
2answers
5k views

How to list ALL directories according to their size? [without including the parent directory]

I have a bunch of random folders, some of them are hidden (beginning with a period). I want to list all of them, sorted by their sizes. I have something on the lines of this in mind: ls -d -1 -a */ ...
2
votes
2answers
133 views

Print text from terminal

I would like to use a Linux distro without a desktop environment, but I need to print out homework that I type up. I could always email it to myself and print from another computer, but it would be ...
21
votes
9answers
27k views

Converting multiple image files from JPEG to PDF format

I want to convert some files from jpeg to pdf. I am using following command. $ convert image1.jpg image1.pdf But I have 100 images. How should I convert all of them to corresponding pdfs? I ...
5
votes
0answers
106 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 ...
15
votes
2answers
1k views

Create a test file with lots of zero bytes

I know how to create an empty file: touch /var/tmp/nullbytes but how can I create a 1MB file that only contains nullbytes on the commandline with bash?
1
vote
1answer
72 views

Command-line parameters in bash script not recognised

I use Debian (Raspbian) Wheezy. If this command line works fine: smsd -c sms/out -i 60 -0 -f sms/smsd.log and this alias also works fine: bsmsd='smsd -c sms/out -i 60 -0 -f sms/smsd.log' then ...
27
votes
5answers
5k 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: ...
1
vote
2answers
4k views

checking running process

I am new babe to Linux. So please skip to read if you are not patient with begineer. Let's say I am asked to check and shut down the processes that I am not familiar with. So when I ls under bin ...
2
votes
1answer
52 views

Login to Skype from terminal or any other way

Please let me know if anybody knows how to login to Skype on Linux Mint from terminal or any other way? I have tried a lot but nothing found. Desktop # ./skype.desktop ./skype.desktop: line 1: ...
1
vote
1answer
36 views

Listing audio files with bit rate in the command line

Is there a way to list the contents of a folder via the command line in such a way that the audio files in mp3 format have the bit rate info? I tried ls -l but it doesn't work.
7
votes
2answers
240 views

Is there a shortcut for repeat the second proximate command in bash?

We all know that !! can repeat the last command you do in bash. But sometimes we need to do some operation like $ python test.py $ vim test.py $ python test.py # here is where I need to repeat the ...
0
votes
0answers
24 views

characters stick at the CLI [duplicate]

When I press arrow up to search through the command history, some characters always remain at the beginning of the command line. Does anyone know what's going on ? How can I fix it? for example, I ...
8
votes
4answers
3k views

command to layout tab separated list nicely

Sometimes, I'm getting as an input tab separated list, which is not quite aligned, for instance var1 var2 var3 var_with_long_name_which_ruins_alignment var2 var3 Is there an easy way to render ...
15
votes
2answers
1k views

Coloring different sources for tail

I'm watching different logs by tail -q -f /var/log/syslog -f /var/log/fail2ban.log -f /var/log/nginx/error.log How can I have the output of each log colored differently?
4
votes
3answers
48 views

Is it possible to view the list of file names of a zip file which is inside another zip file?

I know I can use unzip -l file.zip to view the file list of a zip file. But a got a zip file inside another zip file. I tried unzip -l file.zip/sub_file.zip, but failed. Is it possible to view the ...
3
votes
4answers
429 views

Shell: How do I get the last argument the previous command when it was detached?

Within the shell, typing ALT+. or using !$ recalls the last passed argument of the previous command. I use this all the time, but how do you do that when you detached the previous command? $ ...
118
votes
5answers
21k views

I deleted /bin/rm. How do I recover it?

Just for fun, I thought I would use this command on my Raspberry PI running Raspbian: sudo rm -f /bin/rm I thought I could just reinstall coreutils: I was wrong! apt-get install --reinstall ...
0
votes
1answer
35 views

Less command change color of “~” and “(END)”?

How do I change the color of the "~" characters that go along the edge of a Less command output. And how to change the color "(END)" at the bottom?
16
votes
1answer
4k views

What are the differences between most, more and less?

I'm now using Arch Linux, and find a command most works like more and less. To understand the differences between them is a confusing problem. This Question has mentioned the differences between less ...
2
votes
2answers
70 views

How parse a log file for a string, and when found search backwards for another string

I use the following command to parse a log file for a particular string. Then I search backwards in the log to find the data I really want. The problem as in the example below, I am only going back ...
1
vote
5answers
1k views

Checking if a file exists in several directories

I've been working on this far too long and need some help. I need a script that will look at files in a directory and see if it exists in one of several directories. I need something like this: for ...
97
votes
26answers
18k 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 ...
1
vote
1answer
711 views

How to access u boot environment from linux?

How can I access and change the u-Boot env variables in linux. Using the u-boot/tools/env directory in u boot directory: u-boot$ make env Which created the executable file fw_printenv. I copied ...
13
votes
1answer
5k views

How do I find the window dimensions and position accurately including decorations?

I've been trying to figure out the size of a window for use in a small script. My current technique is using wmctrl -lG to find out the dimensions. However, the problem is this: The x and y figures ...
2
votes
3answers
39 views

Convert a number of seconds elapsed to date from arbitrary start date

I want to convert a particular amount of seconds to a date. In my case the it's the number of seconds elapsed since 1st of January 0001. If it were for seconds elapsed from epoch it would be easy: $ ...
4
votes
1answer
235 views

How to rollback network configuration changes done over SSH in case of failure?

I'm about to change iptables configuration and interface speed and duplex settings over SSH. What are the possibilities to rollback the changes in case of host becomes unreachable? I guess simple: ip ...
3
votes
2answers
400 views

Jingle CLI client / Jitsi replacement / VOIP

I am looking for a Jingle client for the command line. Currently, I use Jitsi, but my dreams of not needing the GUI for more than just web-browsing are not realized due to my reliance on this ...
3
votes
3answers
83 views

How can I delete text before a delimiter in Linux

I need to delete text from a line before delimiter. For example: (123434): hello::{apple,orange,mango}. I need to delete text before first :. i.e. (123434). Is there any command in linux to ...
0
votes
3answers
101 views

Mounting /dev/dvd /media on VirtualBox

I have installed Scientific Linux on VirtualBox and I am trying to follow some exercises on a book I picked up. The first thing I need to do is: mount /dev/dvd /media But when I do that, I get ...
18
votes
10answers
6k views

Is there a robust command line tool for processing csv files?

I work with CSV files and sometimes need to quickly check the contents of a row or column from the command line. In many cases cut, head, tail, and friends will do the job; however, cut cannot easily ...
4
votes
2answers
156 views

Change user info on the command line

I have made a user in Mint 16 but want to change its first and last name without deleting it and starting from scratch. I know how to do it with a GUI but I want to know the terminal command ...
4
votes
3answers
270 views

How to pass each line of a text file as an argument to a command?

I'm looking to write a script that takes a .txt filename as an argument, reads the file line by line, and passes each line to a command. For example, it runs command --option "LINE 1", then command ...
0
votes
1answer
40 views

How to start a cron task?

It sounds really simple, but many times I was stuck at the beginning of learning a new command. The tutorial writer think it's natural to start, but it's not. This is the tutorial I've been reading: ...
5
votes
3answers
687 views

Recursively add a file to all sub-directories

How do I recursively add(or touch) a file into the current directory, as well as all sub-directories? For example, I would like to turn this directory tree: . ├── 1 │   ├── A │   └── B ├── 2 │   └── ...
17
votes
7answers
2k views

how to glob every hidden file except current and parent directory

I want to glob every hidden file and directory, but not the current (.) and parent directory (..). I am using bash. Observe current behaviour: $ ls -a . .. ...a ...aa ..a ..aa .a .aa .aaa ...
3
votes
1answer
159 views

How do I re-stream a filtered video stream using VLC?

I have an input RTSP stream that I want to apply the "cartoon" gradient filter to before streaming on http. I've managed to stream and apply the filter to the local playback, but the http stream does ...
70
votes
6answers
39k 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 ...