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

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4
votes
2answers
163 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
395 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
47 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
757 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
169 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 ...
72
votes
6answers
41k 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 ...
6
votes
2answers
183 views

How many commands can be queued up with control operators?

I have been reading up on control operators, and I was wondering if there was a limit to how many commands you could line up with control operators, such as ||, && and ;. In addition, is ...
2
votes
6answers
85 views

Printing specific section of a line when a trigger value is present

I'm parsing data in the following format: prop1=value1:prop2=value2:prop3=value3+prop1=value4:prop2=value5 parts of the string are delimited by + properties can appear in any order the desired ...
1
vote
2answers
111 views

Pass a command to ROOT from a shell script and having it stay open

I am writing a bash script to perform some analysis using the program ROOT. I want to run some initial command to load the result of the analysis, then continue using ROOT interactively. The analysis ...
3
votes
0answers
296 views

Read out pulseaudio volume from commandline? (I want: “pactl GET-sink-volume”)

I want to read out the volume level I can set with pactl set-sink-volume $SINK $VOLUME Is there an easy way to do that? As easy as the hypothetical pactl get-sink-volume $SINK ? (What I'm ...
3
votes
4answers
258 views

Make many subdirectories at once

Suppose I have a directory /, and it contains many directories /mydir, /hisdir, /herdir, and each of those need to have a similar structure. For each directory in /, there needs to be a directory doc ...
107
votes
15answers
45k views

How to do integer & float calculations, in bash or other languages/frameworks?

Using echo "20+5" literally produces the text "20+5" What command can I use to get the numeric sum, e.g. 25 in this case. Also, what's the easiest way to do it just using bash for floating point, ...
4
votes
5answers
4k views

How can I logout from a graphical environment from the command line?

Part of the beauty of trying out alpha releases of operating systems is that things will break, including things we take for granted. Today it's the turn of the logout button. So, how do you log out ...
4
votes
1answer
3k views

Better way to copy multiple directories to new directory

Is there a better way on the command line to essentially accomplish the following but with a single command cp -r css/ ar/ cp -r images/ ar/ cp -r js/ ar/ cp -r backups/ ar/ I've just been ...
4
votes
5answers
886 views

Use xdg-open to open a url with a new process

I'm starting to experiment with Crunchbang (which is based on Debian, and uses terminator) as a web development environment, and one of the things I am struggling with is the behaviour of xdg-open. I ...
2
votes
2answers
40 views

Select a range of files after sorting them

One thing I notice slower for me if I switch from using a GUI file manager to CLI is: In a GUI file manager, I can quickly select a subset of files under a dir by, first sorting them according to ...
6
votes
6answers
561 views

How can I reproduce commands run on one machine on another machine?

I would like to install some software on a linux-machine that I have run in VirtualBox. Then I would like to do the same thing on a linux-VPS. I think that I can save all commands that I run using ...
12
votes
6answers
9k 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?
1
vote
3answers
45 views

Command to 're-apply' previous command?

Is there an easy way to re-apply a previous command to a new command line entry? Say I typed in chmod u+r,g+x file.txt but forgot the sudo. Could I simply type sudo <some easy symbol>'? ...
9
votes
4answers
3k views

Remove all `at` jobs

I know that to remove a scheduled at job I have to use atrm "numjob1 numjob2", but is there an easy way to do that for all the jobs?
8
votes
3answers
15k views

How do I count the number of occurrences of a word in a text file with the command line?

I have a large JSON file that is on one line, and I want to use the command line to be able to count the number of occurrences of a word in the file. How can I do that?
45
votes
8answers
9k views

How do I delete a file whose name begins with “-” (hyphen a.k.a. dash or minus)?

How do you remove a file whose filename begins with a dash (hyphen or minus) -? I'm ssh'd into a remote OSX server and I have this file in my directory: tohru:~ $ ls -l total 8 -rw-r--r-- 1 me ...
9
votes
11answers
8k views

How can I “cat” a file and remove commented lines?

I'd like to know if there is a way that I could cat file like php.ini and remove all lines starting with ; For example, if the file contained this: ; - Show all errors, except for notices ; ...
2
votes
1answer
75 views

How can I make mailx inform me of new mail?

I'm trying to set up mailx on my server. On one server (Raspbian) I am informed of new mail with a message You have new mail (or something similar). On another machine (Raspbmc), I never have this ...
14
votes
4answers
3k views

how to download a file using just bash and nothing else (no curl, wget, perl, etc.)

I have a minimal headless *nix which does not have any command line utilities for downloading files (e.g. no curl, wget, etc). I only have bash. How can I download a file? Ideally, I would like a ...
1
vote
3answers
504 views

alternative to nslookup in rhel7?

nslookup does not come preinstalled in RHEL 7 Beta. I noticed even dig and host was not pre installed. I read couple of links which mentions nslookup is dead/deprecated, so is there an alternative for ...
2
votes
1answer
63 views

Memory buffer in a bash script

I have recently finished a script that will ask for a hostname and automatically take the argument of the function and ssh into one of my work servers. Here is a copy of my script: #!/bin/bash echo ...
5
votes
1answer
145 views

Command-line incremental backup tools

Which command line backup tool(s) has the best compression ratio? I want to backup my entire system, including media files, text files etc. I found this list on the Arch wiki site but I don't know ...
39
votes
8answers
24k views

How can I edit multiple files in VIM?

I know I can open multiple files with vim by doing something like vim 2011-12*.log, but how can I switch between files and close the files one at a time? Also, how can I tell the file name of the ...
2
votes
2answers
45 views

Copy a folder and its content to all Nginx vhosts host

I am interested to know if a single command line that would allow me to recursively copy a folder to all of our NGINX Virtual Host htdocs folders: I need to copy that folder to all hosts located in ...
4
votes
1answer
153 views

One liner for padding columns (similar to printf) of output from the previous pipe command?

I'd normally use printf to pad each cell with enough whitespace to maintain header position over its respective column. Ultimately I can just iterate over each line of the output and do enough cut ...
1
vote
4answers
7k views

Kill all process of users in Ubuntu?

How to kill all process of one user? When I make ps aux I obtain a list of process with several users, and I want to kill all process of user name1 for example! What's a command to do that in Ubuntu? ...
16
votes
2answers
465 views

How to retrieve lost aliases?

Let me start by saying I know this was dumb. Time and Linux make fools of us all. I made an echo command to my .bash_aliases file and erased all of my aliases, except the test alias. However, I ...
7
votes
2answers
5k views

Samba mount with password prompt as non-root user

I want to mount a password-protected SMB share (served by a Windows machine). The share is protected by a user name and password, and I may not write the password in a file, I want to be prompted for ...
1
vote
3answers
78 views

How to rename file using substring of the same file name [duplicate]

I want to rename my file with its substring.Because unfortunately renamed all the files in my server. Now I want to remove suffix( .gz) of all the files including files in subdirectories also. Below ...
20
votes
5answers
15k views

Is it possible to mount a gzip compressed dd image on the fly?

I like create an image backup for the first time I'm backing up a system. After this first time I use rsync to do incremental backups. My usual image backup is as follows: Mount and zero out the ...
3
votes
2answers
339 views

Proper syntax for “id -r” command

I'm trying to see if id -r will print out the UID or username of the user who logged into the system despite any su's or sudo's. I'm interested in doing this so I can keep people a little more ...
0
votes
3answers
64 views

How do you view a sql.gz file as plain text SQL from the command line?

How do you view a sql.gz file as plain text SQL from the command line? I want to read the SQL statements stored in a .sql.gz file, from the command line on the server. I've tried tar -xzvf, but get ...
-1
votes
4answers
102 views

Need a command sequence that will move files from one directory to another based on a particular year? [duplicate]

I'm looking for a sequence of commands (one liner would be ideal) which will identify all the files created in particular year, and move the resulting files to another directory.
1
vote
1answer
482 views

How to make festival evaulate its own scheme expressions from the command line, so as to change voices as needed?

I can't seem to find any documentation on this. This forum post shows someone trying to change the voice used by festival, outside of the festival interpreter, using a command-line flag. festival ...
8
votes
3answers
569 views

Local, timestamped logging of all ssh commands?

How can I keep a local, timestamped record of all remote commands I use in ssh (command-line openssh client started through bash)? Requirements: Essential: 100% client-side without relying on ...
6
votes
5answers
2k views

How can I run `watch` as a background job?

When I run: watch 'cmd >> output.txt' & the job gets suspended by the system: 3569 Stopped (tty output) Is there a workaround?
-1
votes
1answer
43 views

How to have back the command prompt after calling an application [duplicate]

In terminal I just type firefox and then Firefox starts, but I can not return to command mode anymore. How can I come back to command mode? I have already tried :q or exit, but neither work.
1
vote
1answer
92 views

Formatting an external HDD with Bash script

At my workplace we have an external HDD connected to a NAS device (Synology). There is a backup tasks which runs weekly and fills the external HDD after a while. Unfortunately the Linux-based OS of ...
3
votes
2answers
126 views

Short, simple command to create a group if it doesn't already exist?

What is the cleanest way to modify this command in bash to only run if the group does not exist? groupadd somegroupname A one-liner would be best.
2
votes
1answer
47 views

Play .wav when text scrolls in terminal

After watching a TV show, I came up with a fun idea. Is there a way to take that cheesy high-pitched sound effect they play every time text scrolls down a command-line screen on TV and play it when ...
160
votes
22answers
86k views

Repeat a Unix command every x seconds forever

There's a builtin Unix command repeat whose first argument is the number of times to repeat a command, where the command (with any arguments) is specified by the remaining arguments to repeat. For ...
16
votes
10answers
2k views

Run two commands on one argument (without scripting)

How can I perform two commands on one input, without typing that input twice? For example, the stat command tells a lot about a file, but doesn't indicate its file type: stat fileName The file ...
6
votes
3answers
2k views

How can I print good looking code

Similar to using markdown on Stack Overflow to create monospace output, how can I do that for my programs. I tried lp filename.txt and was pleasantly please to find that it was able to use the local ...