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

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1
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1answer
808 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 ...
37
votes
10answers
8k views

Easy way to determine virtualization technology

I have command line access to a Linux machine which may or may not be virtualized. I want to determine what kind of virtualization technology it runs on, if any (VMWare, VirtualBox, KVM, OpenVZ, Xen, ...
1
vote
1answer
84 views

Best way to find the active wireless device

Of course I know the command: iwconfig which lists devices (and gives info about whether they have a wireless connection). For the purposes of a shell script, I'm really wondering, is there any way ...
0
votes
1answer
405 views

Pass a list of directories to a find command

How can I pass a list of directories to a find command? Imagine you got the list as: ls -d mydir*/ which would output mydir1, mydir2 and so on, but exclude otherdirs1, otherdirs2. I'd like to run ...
3
votes
2answers
2k views

How to get volume level from the command line?

I have a text status bar on a tiling window manager and I am using tcl to feed information to it. At the moment I need a command line that output the volume level 0% to 100%. I am using Arch Linux.
7
votes
3answers
857 views

cp or mv files to same directory they are already in when I am in another?

If I am in ~/blob and I have a file in ~/blob/a_long_directory_name/c/x.x I can type mv blob/a_long_directory_name/c/x.x blob/a_long_directory_name/even_more/y.y Is there any shortcut whereby I ...
3
votes
4answers
639 views

Bash aliases/functions and command line options

I want to set an alias to start nedit together with command line option -noautosave (due to text files up to 500MB). What seemed to be easy: alias nn="nedit -noautosave $1 &" just raises some ...
3
votes
3answers
839 views

Merging two directory without copying the files

Let's say I have as follows : Folder A C1 file a A2 Folder B C1 B2 file b B3 What I want is to merge these two folders, which would give me : Folder C ...
2
votes
1answer
44 views

Can I set defaults for rsync in non daemon mode?

Can I set defaults for rsync in non daemon mode? I know the daemon mode has this configuration file: /etc/rsyncd.conf But I typically use the non daemon version in this sort of manner: rsync -avzcO ...
2
votes
1answer
979 views

Get all images from website

I'm trying to wget all the images pictures from a website. I thought I knew how to use it, but I guess I don't. The images I'm trying to get come from here. The command I'm using is: wget -prA.png ...
2
votes
3answers
526 views

How can I restore an xkilled panel in Linux Mint without a reboot?

In Terminal, one can enter 'xkill' as a command which lets you select a window whose client you wish to kill. In fact, it can even be used to kill panels. How can I restore an xkilled panel in Linux ...
1
vote
2answers
206 views

How to do multiple brace expansions without combinatorial explosion?

I often use brace expansion on the command line, because it's handy. Example {foo,bar} expands to: foo bar Multiple brace expansion also expand, e.g.: {foo,bar}Q{foo,bar} would expand to: ...
1
vote
3answers
546 views

Which cmd is the best for determining the OS' word size (32/64)-bit? [duplicate]

I need to find my OS (not hardware) is 32-bit / 64-bit. Which command is best? uname -p uname -i uname -m arch All the above commands returns the same answer: On 32 bit systems: i686/i386 On ...
3
votes
2answers
349 views

Quickest way to find and replace a string in numerous HTML files

I have numerous HTML files all nested inside different folders contained in a single overall folder. In each of these HTML files I need to replace /contact/index.html With /contact/index.php ...
4
votes
2answers
281 views

Emacs shell mode makes $PS1 different

I have a custom $PS1 variable that looks like this on my command line: And on emacs using M-x shell unfortunately looks like this: Here is my $PS1 variable export PS1='\[\e]0;\u@\h: ...
2
votes
2answers
447 views

Using calibre from the command line

Using calibre from the command line, in debian testing, how can I insert a tag with the syntax being ebook-meta ebook_file --tags rhubarb but for a range of files, but all by the same author ...
3
votes
4answers
642 views

Why is the bash_history always coming up the same and not updating using non-login shells?

The last few days I've noticed that whenever I shutdown my system (Debian Testing) and fire up a bash session, then press the up arrow key, I get the commands from the first time I cleared the history ...
2
votes
1answer
322 views

How to keep the terminal cursor fixed at the top?

When writing in command line I have this aversion to scrolling my eyes down to the bottom of the page as I write commands. How do I keep the cursor/line at the top and allow the output to be ...
-1
votes
1answer
824 views

How to create a GUI in shell script without any third party libs just like setup command [closed]

How to create a GUI in shell script without any third party libs (like setup command)
1
vote
2answers
192 views

Count how many lines start with which characters

I have a file with a number of lines in a file filename. I want to count how many lines start with character 'a', with 'b' and so on in one go. What command i should execute.?
3
votes
3answers
5k views

Remove ^M character from log files

Remove ^M character from log files. In my script I redirect output of my program to a log file. The output of my log file contains some ^M (newline) characters. I need to remove them while running ...
1
vote
2answers
2k views

How to see all commands executed by the current user, in all sessions/screen/byobu terminals?

If there is debian box, some users have access to the root account, some of those users open an ssh connection and start executing commands, some open screen or byobu or other similar tools to execute ...
2
votes
1answer
62 views

e- and f- versions of commands

I noticed that some commands also come in with e- and f- versions, e.g. grep, egrep, fgrep and a few others. Is there some pattern or a naming convention if a particular command should have e- or ...
2
votes
2answers
184 views

Looking for a GUI application to enter linux commands

I am looking for a GUI console where I can enter Linux commands in an entry widget and the result will be output in a text area widget. Is there is such software available? Something like this: In ...
3
votes
2answers
375 views

Mac OS X command-line tools - differences from FreeBSD

As I understand it many Mac OS X command-line tools (like ls, cp, chmod, chown etc.) are imported from FreeBSD. Which version of FreeBSD contains the command-line tools most compatible with the OS X ...
2
votes
3answers
715 views

ssh: execute a command before login

I am looking for a way to execute a local command when logging into a remote machine via SSH. (I want to stay logged in after the command has finished.) In other words, I want to specify the command ...
12
votes
5answers
15k views

Delete 100 lines from vi editor using single command

I am using Ubuntu and trying to delete all 100 lines from vi editor but I got interview question of doing this in one command.
3
votes
1answer
7k views

Command to transpose (swap rows and columns of) a text file [duplicate]

Is there currently a generic command that will "pivot" input. e.g. #labeled.file name: bob title: code monkey name: joe title: pointy haired is converted to: name title bob code monkey joe ...
1
vote
4answers
57 views

Exracting fields in file and storing it in different file in vim

I have file int the following format: . . . Name:abc Occupation:def . . Name:xyz Occupation:ghi . . I want to extract the name and occupation field and save it in another file out.txt ...
12
votes
5answers
13k views

Sorting files according to size recursively

how to scan a folder recursively and find the largest files in the folder, and sort them by size. I have tried using ls -R -S but it tends to list the directories as well I need to scan the folders ...
1
vote
6answers
156 views

How to rename directory from all user accounts

Let say that more users have a tmp directory in their home directory. I want to rename each tmp directory in each user home directory. What is the easiest way? Something like this: sudo mv ...
2
votes
2answers
5k views

tar: short read

I get an error when I uncompress my tar. I do this: tar xvf VM_DECOMPTES.tar and after some time I get the following error: tar: short read What is going wrong here? tar: unrecognized ...
1
vote
3answers
2k views

Unzipping a batch of files

When I try unzip filename.zip it works. However, I need to unzip a series of zip files. Why are: find . -name "*.zip" -print0 | xargs -0 unzip or ls *.zip | xargs unzip not working? In ...
2
votes
1answer
121 views

cp : short way of copying [closed]

I don't remember exactly but there was either cp or mv command which I was able to do something like this with: cp file{.cpp, .cpp.org} Which would copy file.cpp and make a copy named file.cpp.org. ...
1
vote
1answer
184 views

How do I time how long my pg_restore takes in the command line?

I'm trying to track the amount of time the process takes for when I move around my data and upgrade my web app. From the command line, how would I track the amount of time elapsed from when the ...
4
votes
4answers
1k views

Why cat, grep and other commands can't understand files starting with minus sign? [duplicate]

If I have a file which name starting with single or several minus sign, for example --1 it can't be used as a parameter of many commands. Even if I run cat --1 instead of file content I get ...
3
votes
1answer
2k views

Start 4 programs on startup in Linux Mint via terminal

I'm working on a project and I hope you can help me solve a problem. I have four programs that are written in C. They have been compiled using gcc and they work as they should. Because the four ...
0
votes
2answers
256 views

The difference that quotation marks make in find command [duplicate]

When I have a nested directory find . -name "*.py" -print command gives me all the python scripts beneath current directory. However, find . -name *.py -print returns only the python scrips in current ...
3
votes
1answer
1k views

Mutt imap multiple account

My first question on this site, I come quickly. I'm a fan of command line tools and text-based application. I use tmux with a minimalist tiling wm is qtile, I can not change the environment. I'm a ...
1
vote
2answers
235 views

shell saves ip address that you ping? [duplicate]

I was once shown a shortcut that I can't recall/ find. After pinging an ip, then attempting to ssh into it - the ip was saved into to a variable automagically. Something like: ping 10.1.23.4 ...
6
votes
3answers
328 views

find all end subdirectories in a tree

given the following structure: oz123@debian:~/ $ tree . . ├── a │ ├── a1 │ ├── a2 │ └── a3 ├── a1 │ ├── a11 │ ├── a12 │ └── a31 ├── b │ └── b1 │ ├── b11 │ │ └── b21 │ ...
17
votes
6answers
40k views

How can I display the contents of a text file on the command line?

I would like to display the contents of a text file on the command line. The file only contains 5-6 characters. Is there an easy way to do this?
3
votes
2answers
99 views

How to switch to editing command in text editor [duplicate]

When typing a complicated command that started on the command line in Bash, how do I switch to editing it with ViM?
13
votes
6answers
3k views

Text only mode in Linux (No Gnome, KDE, Unity) to prolong battery life

If I want to disable my GUIs completely to save battery life, how would I proceed? I know that I can hit Ctrl + Alt + F3 and be on the command line, but the desktop manager would be in the background ...
2
votes
3answers
263 views

How can I blank the desktop via the command line?

I'm looking for a way to hide the entire desktop + icons and then launching a single app. It's for productivity usage, if that makes any sense. How can I programmatically make my desktop blank (i.e. ...
2
votes
1answer
202 views

convert WAV music library to FLAC on command line and achieve best quality

I would like to produce (nearly) perfect FLAC files by verifying/checking all conversion steps. I'm hoping to do this in a single command, although a short bash script would be acceptable as a second ...
1
vote
0answers
191 views

Can't unlock a file for path change

I'm trying to order the path entries on my mac, but it seems that my /etc/paths file is Locked. I tried the instructions on this link, but I can't save the file as it is locked. I even tried chflags ...
11
votes
2answers
3k views

What is meant by a shell is in “vi” mode or “emacs” mode?

This question follows directly from the answer to one of my previous questions here. I am newbie to unix world and this site has helped a lot to understand some core concepts. In this case I am ...
1
vote
1answer
463 views

How can I move between words in the command prompt in tcsh in linux?

I want a feature like vim's going forward or backwards command (w,e,ge,b) etc in the shell prompt. I am using tcsh shell in Linux. I would like to go 'n' number of words backs or forward etc and do ...
3
votes
2answers
152 views

Can I run a command after the user uses Ctrl-C to kill a command?

So at my position we use a shared set of aliases to do builds. Something like... alias 'build'='cd $BUILD_ROOT; m; cp ...; cp...; deploy; deploy; deploy; cd -' This is super irritating because the ...