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

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3
votes
1answer
58 views

rlwrap -z pipeto: piping output through pagers

I am using rlwrap to colorize prompt in asterisk CLI: rlwrap -s 99999 -a -pRED /usr/sbin/asterisk -r I read in man rlwrap that I can also use rlwrap -z pipeto to pipe output through a ...
2
votes
1answer
13k views

force rsync to overwrite files at destination even if they're newer

I have an rsync backup script I run, which also restores files back where they came from when I ask. But if the files at the destination are newer than those in the backup when I try to restore, it ...
1
vote
0answers
31 views

Printing to the terminal after boot

I am attempting to start a script that echos to the terminal once matchbox-terminal is loaded. I am able to run the script if I execute it in the existing xsession script located in ...
1
vote
1answer
57 views

awk with variables in condition and in output redirection file

I would please like some help with this command because I didn't find anything in documentation that can cover everything I want. I have some variables that are global, so I would prefer to keep them ...
20
votes
2answers
1k views

Is there a reason why ls does not have a --zero or -0 option

This question was prompted by questions about ls' -1 option and the recurring tendency of people to ask question and answers that includes processing the output of ls. This reuse of the output ls ...
2
votes
1answer
30 views

Is there a command that outputs ONLY the packages explicitly installed by the user? (ubuntu/debian)

I have tried searching for this but there seems to be no command that can output a list of packages (ideally in Ubuntu) that I have installed, not including any dependencies.
0
votes
1answer
30 views

unable to remove stopped job with ctrl+c

When I tried to change from super user to common user and therefore typed "exit", I got an error message, that a job was stopped and I could not log out as root. So I listed the jobs: #jobs [1]+ yes ...
7
votes
4answers
9k views

Command Line Tool for monitoring Java Heap

Is there any command line tool for monitoring the heap size usage of Java in CentOS?
3
votes
2answers
136 views

How do you stop a bash shell expansion?

I know some methods for stopping process. When I type: echo {1..999999} > filename.txt I can't stop it from running. I can stop other processes with Ctrl+C | Ctrl+D | Ctrl+\ and etc. But none ...
11
votes
3answers
419 views

How can I make a graphical plot of a sequence of numbers from the standard input?

If have a long text file and I want to display all the lines in which a given pattern occurs, I do: grep -n form innsmouth.txt | cut -d : -f1 Now, I have a sequence of numbers (one number per line) ...
0
votes
1answer
55 views

How can I observe my own actions via terminal

To understand Linux better I want to see which commands run in background. For example when I create new file via GUI, is there any way to see the which command runs in terminal?
2
votes
2answers
229 views

Is it possible to login as root without the interactive password query ?

When I want to login as root, I usually have to type: su -l and than an interactive query starts in order to receive the password. Is it possible to login as root without this interactive query ? ...
6
votes
4answers
10k views

Use sed to find whole word and replace

I have the following block of text in a file: test3.legacy test4.legacy test3 test3.kami I only want to search for test3 as a whole and replace it with nothing. Unfortunately, all my attempts have ...
0
votes
0answers
19 views

How to read - in Linux? [duplicate]

Whenever I am dictating linux CLI commands to someone I get in a dilemma on how to say - in English. For example, to dictate ls -la I sometimes say L S minus L A or L S hyphen L A or L S dash L A. Is ...
2
votes
4answers
129 views

Creating directories in a loop and moving files to those directories

Consider a directory with N files. I can list the files alphabetically sorted and store the list by ls > list Then I want to create n sub-directories in same directory, which can be done by ...
1
vote
1answer
34 views

Why do my run level directories contain only start scripts and no single kill script?

I learned here that for each runlevel exist a directory with start and kill scripts. The start scripts are activated on entering , the kill scripts on leaving the runlevel. Start scripts and kill ...
20
votes
4answers
856 views

Is it possible to redirect the output of a command into more than one command?

As far as I know, I can use the tee command to split the standard output onto the screen and further files: command -option1 -option2 argument | tee file1 file2 file3 Is it possible to redirect ...
29
votes
8answers
39k views

How can I get a count of files in a directory using the command line?

I have a directory with a large number of files. I don't see a ls switch to provide the count. Is there some command line magic to get a count of files?
26
votes
3answers
19k views

How to remove a single line from history?

I'm working in Mac OSX, so I guess I'm using bash...? Sometimes I enter something that I don't want to be remembered in the history. How do I remove it?
1
vote
0answers
18 views

How to start the twm manager on a system which already has a window manager ?

I am using linux mint codename rebecca with xface. I tried to follow a description how to start a window manager of once choice: created an empty .xinitrc file in my homefolder filled the file with ...
30
votes
6answers
17k views

Split pages in pdf

I have a scanned pdf file which has scanned two pages on one virtual page (page in pdf file). The resolution is with good quality. The problem is I have to zoom when reading and drag from left to the ...
0
votes
0answers
17 views

How to install a particular version of boost with brew on MacOSX?

The command "brew install boost" works for me on my MacOSX, but it installs the latest boost 1.57. How to use brew to install the older 1.55?
2
votes
4answers
310 views

What is the difference between (cp f1.txt f2.txt) & (less f1.txt > f2.txt) [duplicate]

I know that both will copy data from f1.txt to f2.txt, but what is the real difference? (cp f1.txt f2.txt) vs: (less f1.txt > f2.txt)
4
votes
1answer
2k views

Cannot set up screen panning in Ubuntu with xRandR which states that it cannot find the modes

I am using a Samsung n150 netbook with a 10.1 inch screen and it has a maximum screen resolution of 1024x600. I am running Ubuntu 10.04 LTS and want to enable screen panning for a larger virtual ...
10
votes
7answers
2k views

Is it possible to reverse a command in the bash shell?

I was wondering if there is a (simple) possibility to redo/reverse a command that was executed in the bash shell? (to make it undone) Is there something similar to the ctrl+z combination to redo any ...
3
votes
3answers
1k views

Are there any command line utilities that can capture joystick button presses?

Here's my situation: I have a Raspberry Pi with Raspbian installed on it. I also have RetroArch installed and a simple USB gamepad hooked up. Everything works fine, but I wanted to set it up so that ...
0
votes
1answer
26 views

How can I expand a terminal using the command line? [duplicate]

When I start the terminal in my xfce Destop environment a black winodw about a quarter of the screen size appears, if I want to expand it to full screen size I have to click on the "+"-shaped symbol ...
1
vote
2answers
22 views

Transform values in a line by first field

I was wondering if there is an easy way to do the following without writing a script. Transform 1234,"a;b;d" 2345,"e;f;g;h" to 1234,a 1234,b 1234,d 2345,e 2345,f 2345,g 2345,h
1
vote
5answers
3k 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 ...
1
vote
1answer
130 views

Operate X clipboard from command line

I'd like to copy and paste to the clipboard from the command line. I've found two utilities that works with "mouse" selection: xclip and xsel. But they both ignore the clipboard that is filled with ...
1
vote
1answer
237 views

How can I add applications to the lxpanel application launch bar via cli?

Is there a way on LXDE toolbar to change what applications are on the quick launch part via the terminal so that it can be put in a batch file to change on multiple clients?
2
votes
1answer
23 views

Sandbox an account and prevent it from any system modifications

I am trying to sandbox a user account to the point where it cannot edit or view any files beyond a certain folder, namely /home/user/test. This account will be compiling and running a C++ program that ...
9
votes
1answer
353 views

Why does the echo command do not work with at command?

when I type: at now + 1 min at>play /usr/share/sounds/startrek.wav at>ctrl+d it works, so after one minute there is actually a sound played. but, when I type: at now + 1 min at>echo ...
0
votes
1answer
155 views

extract number of bytes out of a file

Is it possible to extract a few number of bytes out of a file using dd ? The file is located on a secondary drive. I apologize if this is a simple question however I'm no pro at command line.
0
votes
1answer
219 views

Replacing white-space / characters with backslashes [duplicate]

I want to convert a bunch of mkvs to mp4s with the following command: for i in $(ls *mkv); do ffmpeg -i $i -vcodec copy -acodec copy $i.mp4; done; However, the filenames have whitespaces and ...
8
votes
3answers
2k views

How do you send command line apps directly to the background?

I already know that pressing ctrl+z stops the app, then I can send the app to background with the bg command, but that means there is a brief preiod of time that the app is stopped. How do I send the ...
28
votes
3answers
11k views

How can I “relink” a lot of broken symlinks?

I have a directory tree which has a bunch of symbolic links to files under /home... however, I have moved /home to /mnt/home and need a way to "relink" all of the symlinks. Does such functionality ...
0
votes
1answer
263 views

ipmitool set idrac mode

I have a DELL server R610, on this server there is a RHEL 6.4 This server has an idrac entreprise. I would like to configure the idrac from command line, avoiding reboot. I read on the man page of ...
0
votes
3answers
34 views

Why do du's subdirectory values not sum up to total?

I'm trying to use du to investigate disk usage in a directory like so: du -hd1 | sort -rh This gives me a list that starts as follows 61G . 7.9G ./A 5.1G ./B 2.7G ./.C 1.6G ./.D ...
9
votes
8answers
14k 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 ...
1
vote
0answers
23 views

Check if there is no GUI

Is it possible to check if a UNIX machine (Mac / Linux) has a GUI? Basically I would like to distinguish between: UNIXes with GUI (i.e. normal Macs, Linuxs) UNIXes with no GUI (i.e. Mac server/ ...
0
votes
4answers
62 views

How does “-dc” work in “cat /dev/urandom | tr -dc ”01"?

So far I know, the /dev/urandom file is one of the special files, it's purpose is to generate random characters. When I execute cat /dev/urandom a stream of strange characters, some even Chinese ...
0
votes
1answer
22 views

How to switch from input mode into command mode in ed ?

As far as I know, ed starts in command mode. Once I input i,a or c ed changes into input mode. So far it worked. Now I read that in order to switch from input mode into command mode one has to input ...
2
votes
1answer
38 views

How can I redirect output files to a specific directory/folder

Suppose I have an executable in Unix. Suppose the name of the .exe file is myExe and it takes two parameters. I did not create this executable, this is a freely available one. myExe generates 4 ...
15
votes
5answers
15k 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 ...
0
votes
2answers
57 views

Why would the prompt get overwritten?

p_ash-3.2$ cp some_file1234.html /some/loc/ation/ofthe/some_file1234.html.html_Backu Have been seeing this intermittent issue with the command-line, while typing longer lines as part of any command, ...
0
votes
2answers
53 views

use `mv` command and my file gone [closed]

i want to move myfile.tar.gz to folder My command is mkdir backup mv myfile.tar.gz /backup arrrgh, and the file gone in /backup directory not exist, try using find command not shown how to ...
3
votes
0answers
31 views

Convention/standard on using curly braces around options

Man page for tar in arch linux SYNOPSIS section starts with: tar {A|c|d|r|t|u|x}[GnSkUWOmpsMBiajJzZhPlRvwo] [ARG...] I perfectly understand that in this situation it means that exactly one of them ...
12
votes
4answers
25k views

How to check password with Linux?

I want to check, from the linux command line, if a given cleartext password is the same of a crypted password on a /etc/shadow (I need this to authenticate web users. I'm running an embedded linux.) ...
9
votes
4answers
484 views

How to remove duplicate characters?

If I am having a line as: Thhiisss iisss mmyyy nameeee I want to print this as: This is my name What is the unix command for this?