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

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3
votes
1answer
4k views

What commands can I use to enable / disable Apache2 modules?

What are the terminal commands used to enable and disable Apache2 modules? Update: Since the commands appear to differ based on distribution, I have made this question a community wiki where ...
5
votes
2answers
2k views

Scripting htdigest -c /path/to/file/$user $user $password in Bash

I want to be able to script with a password in variable $password. htdigest -c /etc/apache2/pw/$user $user $password At the moment it asks me to manually enter a password; this is not going to be ...
89
votes
31answers
26k 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 /[full-path]/...
1
vote
1answer
30 views

How do I change FROM address using mailx on FreeBSD from command line?

I'm using following system: $ uname -a FreeBSD X 9.2-RELEASE-p17 FreeBSD 9.2-RELEASE-p17 #0 r282430: Mon May 4 13:59:58 PDT 2015 root@X:/usr/obj/usr/src/sys/R610 amd64 $ pkg info mailx mailx-0....
2
votes
2answers
44 views

Print text between two strings - omit second occurrence

I have an instruction file with a lot of steps. I'd want to view a single desired step in a shell, without graphical environment. What I do right now, as pointed out by alemol, is using sed to extract ...
2
votes
1answer
13 views

Why xdotool is not clicking when restoring position?

Why xdotool is not clicking when restoring position? xdotool mousemove --sync 4000 1000 click 1 mousemove restore If I don't restore the position, it works, example: xdotool ...
3
votes
0answers
41 views

Dbus: Logout other user

I'm new with dbus. I know how to logout current user from terminal using dbus messages dbus-send --session --type=method_call --print-reply --dest=org.gnome.SessionManager /org/gnome/SessionManager ...
1
vote
2answers
52 views

Convert command output to csv, with time stamp

I want to test a speed connection with terminal command: ./speedtest-cli And it returns This: Retrieving speedtest.net configuration... Retrieving speedtest.net server list... Testing from Moscow,...
1
vote
2answers
2k 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 ...
2
votes
1answer
25 views

MySQL command line - bind <UP> key to a backward command search

With mysql command line client on Ubuntu 14.04 I could bind UP to a backward command search by adding the following lines to ~/.inputrc # type a word, hit up and a search is performed # "\e[A": ...
2
votes
3answers
131 views

Extract a line if the first field contains a dot

The actual data is: Dolibarr techpubl http://techpublications.org/erp tekstilworks.com WordPress tekstilw wbq.dandydesigns.co WordPress ...
30
votes
2answers
29k 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
votes
1answer
37 views

Explain the output of realpath [closed]

I am trying to use the command line to return the absolute path to a file. I read that there are multiple ways to go about this, namely the realpath, readpath -f, and locate commands. None of these ...
1
vote
1answer
44 views

Will these commands return the same output on different Linux distributions? [closed]

I am writing a monitoring script. I am running it on a specific machine, and it works. It is planned to be ran on several Linux machines, not bound to a single distribution. Here are the commands and ...
1
vote
1answer
41 views

How to re-format a matrix

I have a file like this: column1 column2 column3 column4 column5 5e-05 1e-05 0.00083 4e-05 0.00021 6e-05 3e-05 1.00083 2e-05 1.00021 And I need to re-format it to print and output ...
0
votes
4answers
64 views

how to show port numbers that are listening for the incoming connections under TCPv4?

I want to use command line to show only the port numbers after ":" only This is what I'm trying to do sudo netstat -ant |grep LISTEN|grep :|sort -n|cut -c 45- It shouldn't list any tcp6 info
10
votes
5answers
24k views

How to use /dev/fb0 as a console from userspace, or output text to it

So I have a Palm Pre (original P100EWW) model that I enabled developer mode on, and installed a Debian Squeeze chroot. Works great. I have plans to use this for ANYTHING (bittorrent peer, web server)...
0
votes
0answers
23 views

Get rid of ksshaskpass in KDE Plasma (Fedora 23)

I'm using Fedora 23 with KDE 5 Plasma. I'm new with KDE, and I'm still setting up the environment so it can fit me. I recently used a git command, which asked for my github credentials - but instead ...
152
votes
18answers
85k views

How to have tail -f show colored output

I'd like to be able to tail the output of a server log file that has messages like: INFO SEVERE etc, and if it's SEVERE, show the line in red; if it's INFO, in green. What kind of alias can I ...
2
votes
1answer
61 views

bash case-insensitive commands matching

Is it possible for bash to find commands in a case-insensitive way? eg. these command lines will always run python: python Python PYTHON pyThoN
1
vote
0answers
33 views

How to read the password of a user and implement it in the subsequent commands?

I am writing an api call that requires the user id and password of the user. I can get the user id but how to get his password and supply it to a variable? Here is the api command curl -u $user:$...
3
votes
4answers
95 views

All possible permutations of words in different files in pairs

I have multiple files, let's say file1, file2 etc. Each file has one word in each line, like: file1 file2 file3 one four six two five three What I want is to combine them in a new file4 in ...
0
votes
1answer
47 views

how to read all bios settings in linux programmatically

I don't think that dmidecode shows all the bios settings . Is there a way to read all the bios settings programatically in SLES?
25
votes
4answers
17k views

Why isn't there any shell command to create files?

Attention please: I am not asking how to make a file from the command line! I have been using touch for making files for years without paying attention that its main purpose is something else. If ...
1
vote
3answers
373 views

Removing multiple lines

I am trying to write up a command line interfaces that will removes a particular section / lines of codes within a list of json files. By the way, the json file are located within the sub-folders of ...
1
vote
1answer
32 views

detecting sound from speakers

I have decided to make a radio from my old laptop. I installed Puppy linux and set special features, like: after waking up, it turns on my favorite online radio (openFM) and switches off the screen. ...
54
votes
7answers
37k views

How can I see dmesg output as it changes?

I'm writing a device driver that prints error message into ring buffer dmesg output. I want to see the output of dmesg as it changes. How can I do this?
4
votes
3answers
19k views

ls to show only directory/filename and size

First of all, this is not a duplicate of this: Linux ls to show only filename date and size Because I want to print actual directory name additionally. I was always using this command: ls -l | awk '...
8
votes
1answer
2k views

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 14....
5
votes
2answers
15k views

Difference between ifconfig and ipconfig? [closed]

What is the difference between ifconfig and ipconfig? What do dhcpcd and ifconfig actually do?
1
vote
1answer
20 views

View path options when using readline?

When I am typing in a path at the bash prompt I sometimes do not remember what the directories are so I cannot incrementally search for them. Is there a way in readline to cycle through the ...
2
votes
4answers
51 views

Access a file located with find

In many cases after I find a file using the find command I then want to open the file or cat it or maybe print it. How can I operate on the result from find? For example, : find . -name "myfile.txt" ...
1
vote
1answer
38 views

Move files several directories up for several directories with similar layout

I have a directory with the following layout (the layout in Directory 1 is repeated in every other Directory <num>): Parent directory Directory 1 some directory another ...
2
votes
6answers
8k views

ls command - define number of columns

Is there a way to define the number of columns in ls output? I got this far: ls -C sorts in columns and ls -1 produces one column. --tabsize = option to produce two columns resulted in what looks ...
0
votes
2answers
44 views

How can I copy a hidden directory recursively and preserving its permissions?

mkdir backupcache cp -rp .cache backupcache # or cp -rp \.cache backupcache does not work nothing gets copied and directory backupcache remains empty
1
vote
2answers
120 views

find: meaning of the \? sign as a value of the name parameter

What is the meaning of the ? sign in the following command? find /foo/path -name \?
1
vote
2answers
45 views

A quicker way to change owner/group recursively? [duplicate]

Currently, when I want to change owner/group recursively, I do this: find . -type f -exec chown <owner>.<group> {} \; find . -type d -exec chown <owner>.<group> {} \; But ...
21
votes
5answers
2k views

How to run a command at an average of 5 times per second?

I have a command-line script that performs an API call and updates a database with the results. I have a limit of 5 API calls per second with the API provider. The script takes more than 0.2 seconds ...
1
vote
2answers
49 views

How to upgrade/downgrade a specific package from “sid” on debian jessie “stable”? [duplicate]

I need to upgrade some specifics packages from sid on debian jessie stable with their dependencies. By adding the following repo : deb http://ftp.fr.debian.org/debian/ sid main deb-src http://ftp....
3
votes
4answers
129 views

Where should I save color codes for the PS1 command line / terminal? [closed]

This question is about best practices. I know logging in over secure shell or switching users su, and su -l have different effects. Also, in the event you make a typo in the configuration, you still ...
4
votes
4answers
60 views

Most efficient way to thin out a backup which uses hardlinks

I have a backup disk which contains hundreds of backups of the same machine from different dates. The backup was made with rsync and hardlinks, i.e. if a file doesn't change the backup script just ...
36
votes
11answers
29k 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 .
12
votes
2answers
7k views

Ctrl+D for ending terminal line input

If I do $ cat > file.txt textCtrl-DCtrl-D Question 1: If I don't press enter, why do I have to press Ctrl-D twice? If I do $ cat > file.txt pa bam pshhhCtrl-Z [2]+ Stopped ...
0
votes
1answer
33 views

FFMpeg : Creating a video clip of approx. 10 seconds when video duration is unknown without audio-

I am working on a project where I am looking to extract a video clip from an input video. I have found many links(Eg : link) which do this task, but in all this I have to specify video duration. ...
1
vote
1answer
82 views

pattern matching without echo

Why are the outputs different? touch a aa bb ccc echo * a aa bb ccc // I understood, * means matches zero or more * aa bb ccc // I'm confused. echo ? a //OK ? a aa bb ccc // confused ...
1
vote
4answers
59 views

execute command over ssh connection [duplicate]

I want to excecute the following command over a ssh connection: tmpValue=$(cat /var/run/jboss-as/jboss-as-standalone8.pid) && top -b -U jboss -n 1 |grep $tmpValue |awk '{print $9}' This ...
185
votes
9answers
324k views

How do I get the size of a directory on the command line?

I tried to obtain the size of a folder (containing folders and sub folders) by using the ls command with option l. It seems to work for files (ls -l file name), but if I try to get the size of a ...
19
votes
5answers
22k views

find n most frequent words in a file

I want to find, say, 10 most common word in a text file. Firstly, solution should be optimized for keystrokes (in other words - my time). Secondly, for the performance. Here is what I have so far to ...
14
votes
4answers
129k views

How do I exit or cancel a bad bash command?

I expect to get some flak for this, but I can't find the answer anywhere. It seems like it should be so obvious. Sometimes, when I type a bad command in a bash terminal, the cursor just jumps down to ...
1
vote
1answer
60 views

copy huge number of files into date structured directory order

I need to copy around 40.0000 files into date structured folders. example file: /var/public/voicelogging/quality_monitoring/20151209/bbbbbb_I_20151209-185841_xxxxxx_12434_89343.WAV Is one of the ...