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

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0
votes
1answer
36 views

Copy process output few lines to a file

I want to copy the xinput-calibrator output to the temp.txt file from my Qt application. I am starting the QProcess from the Application Using the command xinput_calibrator | tee log.txt, I am ...
15
votes
3answers
1k views

Manipulating X key and pointer grabs on the command line

What command line tools exist to list and manage X server grabs? (That's grab as in key and pointer grabs, i.e. restricting the use of a particular key or mouse button to a particular application, or ...
7
votes
4answers
838 views

Is it possible to name a part of a command to reuse it in the same command later on?

If I want to move a file called longfile from /longpath/ to /longpath/morepath/ can I do something like mv (/longpath)/(longfile) $1/morepath/$2 i.e. can I let the bash know that it should remember ...
10
votes
4answers
11k views

How to revert chown command?

If I run: sudo chown -R user:user / Can I revert it to what it was before I ran it?
1
vote
0answers
27 views

Is there a common way to render out pdf files in a human-readable format on the command-line and keep the general layout?

I'm imagining something deeper than pdftotext (part of poppler-utils), because what I was imaging would be possible, would be to retain most of the layout on a virtual page, e.g. pipe this through a ...
-8
votes
2answers
136 views

What does the cd /etc command do?

I was asked the question "what does the cd /etc command do?". This is my answer: This command cd /etc changes directory to the directory specified after the slash /. The /etc refers to a folder in ...
3
votes
1answer
39 views

Problem with encoding in shell script

I have the following code: #!/bin/bash task=$1 xml=$(curl -sL "http://login:pass@server.com/issues/$task.xml") id=$(xmllint --xpath '//issue/id/text()' --format - <<<"$xml") name=$(xmllint ...
8
votes
3answers
10k views

CentOS: Install packages listed in a text file?

I have an existing CentOS installation which I'd like to install extra packages to. The packages to be installed were supplied to me in a list, one package per line, which looks like: .... ...
2
votes
2answers
54 views

cd out of deleted folder

Is there a way to cd out of a directory which has just been deleted (go up one level into the upper folder which still exists? It often happens to me that I have a console opened for a folder, and ...
1
vote
3answers
2k views

How can I start a process using cpulimit?

I am trying to use cpulimit for testing an app I'm developing under low resource conditions, and I need the process to start under the influence of cpulimit. It is not sufficient to start the program ...
27
votes
7answers
11k views

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 ...
6
votes
5answers
3k views

How to print a range of IP addresses with Linux seq command

How can I print a range of ip addresses on linux command line using the "seq" command? For eg: I need seq to print a range of ip from 10.0.0.1 to 10.0.0.23 . Seems like the period in between the ...
0
votes
0answers
33 views

how to run android dex from command line in ubuntu 14.04

I write a program which has ant build file with this command: <exec executable="dx" dir="${workdir}"> <arg value="-JXmx${env.JavaHeap}"/> <arg value="--dex"/> <arg ...
3
votes
1answer
54 views

Unable to get NAT working via iptables PREROUTING chain

So, not concerning ourselves with the WHY, and more so with the HOW, I'd like to see if anyone knows where I'm going wrong here. Basically, I'd like to forward all packets headed for port 80 on an IP ...
45
votes
11answers
37k views

Which mp3 tagging tool for Linux?

Which app would you recommend for Linux to tag MP3s? Under Windows I used to use tag&rename and liked it a lot; it works well under Wine, but I want something that runs natively
41
votes
6answers
72k views

Set volume from terminal

Is it possible to set the audio volume using the terminal?, instead of clicking the speaker icon in the topbar, the reason I want need to do this is because my keyboard does not have a volume ...
0
votes
1answer
65 views

Shell script - creating and assign to groups advice needed on my script

Where could I include man useradd and -g and G i'm not sure where to include these commands above. The current shell script doesn't successly create the user but does run. #!/usr/bin/env bash ...
2
votes
1answer
29 views

Insert string or line after last instance of a specific search variable, in a loop

I'm wondering if someone could help me with a specific coding question. I have a DNA sequencing file that reads something like this (as an example): ...
-9
votes
1answer
51 views

Unix “ls” command? [closed]

Can someone explain to me what are all the options available with the -la flags for the ls command ? I have read the man pages, but still not sure.
3
votes
2answers
78 views

Modify Openbox key-bindings from commandline

I am using the LXDE desktop environment, which is based on Openbox. I know how to change the key-bindings by editing my ~/.config/openbox/lxde-rc.xml, e.g.: <keybind key="A-F11"> <action ...
1
vote
0answers
41 views

Find list items in other file [duplicate]

I have one file with hundreds of unique IP addresses (each on a separate line) from which a bot tries to login to one of our services. I would like to see which of these addresses appear in another ...
-1
votes
4answers
35 views

How can I address the path/file I just specified again? [duplicate]

Say I'll start writing sudo cp /etc/var/more/evenMORE/fileABC and as the target of the copying, I'd like to define the same folder, except just a different filename (whether it is a new name like ...
42
votes
8answers
21k views

diff within a line

I have some sql dumps that I am looking at the differences between. diff can obviously show me the difference between two lines, but I'm driving myself nuts trying to find which values in the long ...
30
votes
6answers
9k views

Single dashes `-` for single-character options, but double dashes `--` for words?

Where did the convention of using single dashes for letters and doubles dashes for words come from and why is continued to be used? For example if I type in ls --help, you see: -a, --all ...
1
vote
1answer
47 views

Is bash command line interpreter implemented on emacs?

I'm investigating the relationship between bash and emacs shorcuts. Someone told me that the reason why they're similar is that bash uses emacs as its command line interpreter. However, I haven't ...
1
vote
1answer
51 views

How can I access the history buffer in sh? (not in Bash)

Is there a command history in sh, for example how to access it, and as well, how to ensure it is clear? To clarify shells here: let's say you've logged on to a non-Gui Linux system, and $SHELL is ...
1
vote
2answers
104 views

Command to simulate keyboard input

Is there a command that exists that can simulate keypresses? I want to pipe some data to it to make it type into a GUI program for me.
1
vote
2answers
33 views

Search for processes which are CPU consumming

I can track the process launched by the user4 with awk: ps aux | awk '$1~/user4/' And also to track what process consume more than 10% CPU: ps aux | awk '$3> 10' Hoe the question is not too ...
7
votes
1answer
5k views

Zip the contents of a folder without including the folder itself

I have a directory called folder that looks like this: folder -> root_folder -> some files I want to zip this directory into zipped_dir, I tried: zip -r ...
21
votes
7answers
5k 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 ...
0
votes
5answers
67 views

Remove the latest modified file

I have created two files: sample.txt and sample.txt  (the second file contains some hidden characters, e.g. a space). How can I remove the latest modified file? I'm using Linux.
0
votes
2answers
68 views

why is btmp not showing the username of logged in users?

I am trying to compare the output of the btmp file and who -a commands. I don't know why, but btmp file currently is not showing the username but its showing UNKNOWN in the username field. I am ...
0
votes
1answer
41 views

How to force an application to use a specific cpu? [duplicate]

For example : To build a kernel we can use make it will take more than one hour , to accelerate the process we can use make -j4 all this may finish almost four times as quickly. Generally : How to ...
169
votes
3answers
44k views

What does “--” (double-dash) mean? (also known as “bare double dash”)

I have seen -- used in the compgen command. For example: compgen -W "foo bar baz" -- b What is the meaning of the --.
5
votes
3answers
613 views

Remove file, but only if it's a symlink

Ideally I'd like a command like this rm --only-if-symlink link-to-file because I have burned myself too many times accidentally deleting the file instead of the symlink pointing to the file. This ...
1
vote
1answer
39 views

“time > time.txt” refuses to work propely

I just started learning Linux commands. I was experimenting with the > command, that, as far as I understand, makes the command before it write it's output to the file after the sign. This ...
1
vote
1answer
28 views

Is there a program that will launch a configurable context menu

I'm looking for something like Zenity or Yad, except I want something that behaves like a menu, namely: it opens right next to the cursor; it takes one click to select things; it's possible to have ...
3
votes
2answers
51 views

On applying commands to groups of lines from stdin

The Unix package datamash supports the application of several summarizing operations to groups of input lines. For example1, here datamash is used to compute the sums of column 2 for each value in ...
1
vote
1answer
104 views

Is there a way to change KDE4 display settings from the command line?

Consider the following setup: My laptop is normally located at my desk connected to power, external keyboard and mouse and an external monitor. Since the laptop's screen is pretty small and my monitor ...
3
votes
4answers
12k views

Telnet on Linux Server

I want to know if it is necessary to have telnet enabled on both sides of machines to get telnet connection. Here's the issue: I am trying to telnet some public IP on port 80 from a Linux web server ...
0
votes
2answers
101 views

Linux server terminal - rows of tildes, can't write commands?

I'm pretty new - came across this problem. My webserver terminal is looking weird, there are some code echoes and then rows and rows of tilde. Where I type would be at the green square, but nothing I ...
3
votes
2answers
8k views

List of available command options?

I'm currently setting up my first web server without a control panel and so far things are going pretty good! I was just wondering if anyone could direct me to somewhere that explains all of the ...
0
votes
1answer
35 views

Unable to detach a USB device on Ubuntu 14.04

I was using udisks to unmount and detach usb device with following commands which works just fine on Ubuntu 10.04 udisks --unmount /dev/sdb1 udisks --detach /dev/sdb Because udisks is not available ...
4
votes
5answers
4k views

Pipe the output of a command to rm command

Following command prints the path of the song being played. mpc | head -n 1 songs/oldSongs/Mukesh_D/041 KANHAIYA = YAAD AAYI ADHI RAAT KO.mp3 Can I delete this file by modifying the command I used ...
3
votes
1answer
116 views

What Command Line tools to connect from Unix to remote Windows?

I need to make some scripts for connecting from a Unix server to several Windows stations for automating file transfers. GUI is not needed and I can't install any additional software into Windows ...
0
votes
4answers
643 views

Unix grep confusion

I am doing an assignment for school and using putty to complete the assignment. The format of the assignment does not allow for much variation and thus only one answer is sufficient enough to allow me ...
9
votes
2answers
13k views

Creating a messagebox using commandline

How can I create a message box using command-line to show a text‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌?
2
votes
2answers
250 views

Getting Public IP address of EC2 instance from outside using AWS-cli [closed]

I am trying to make use of Amazon's elasticity and bring instances online and off using the AWS cli. But as you know, every time you offline a system, and bring it back to life, it comes with a new IP ...
0
votes
0answers
22 views

How to recover content of the file in unix? [duplicate]

I accidentally gave cat >filename instead of cat filename and my content is lost.Now I have only my file,but content is deleted.How to recover the content alone? Please help me to get back the ...