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

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4
votes
2answers
3k views

pdf viewer for command line only

Is it possible to view pdf documents without having gdm (or similar) running? Rationale: I'm working on a remote server (assume no X forwarding) processing some data, creating some plots (assume pdf ...
2
votes
2answers
2k 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 ...
5
votes
2answers
161 views

What's the “Unix way” for a CLI app to report no arguments specified?

I'm developing an application which I'd like to follow the "Unix way." What should I program it to do in case it is called with no arguments (which makes no practical sense): display an error ...
0
votes
2answers
134 views

How to act on output from a failed command [duplicate]

Possible Duplicate: What is the easiest way to execute text from tail at the command line? I was guessing the ouput of a command that fails to execute should be sent to stdout and hence can ...
0
votes
1answer
2k views

How to pkill from a script?

How can I write a script that basically just runs pkill -HUP inetd? I want to restart inetd via a script so I can schedule it to run at a particular time. I tried to write it myself, but I'm getting a ...
5
votes
1answer
7k views

Encode with ffmpeg using avi to mp4

What command lines to use to convert from avi to mp4, but without destroying the framesize and making the file small as the original size or a little bit bigger, and same thing with mp4 to avi? ...
1
vote
0answers
318 views

ffmpeg: error while running with libx264

Main code: ffmpeg -i 2269801.avi -threads 0 -vcodec libx264 -b 900k -acodec libfaac -ar 44100 -ab 96k -ac 2 earthgirlsareeasy1.mp4 [libx264 @ 0x16cdde10]broken ffmpeg default settings detected ...
8
votes
4answers
794 views

What is the easiest way to execute text from tail at the command line?

Sometimes I'm working on a new (ubuntu) box and I type git and am alerted: The program 'git' is currently not installed. You can install it by typing: apt-get install git-core If that happens I ...
4
votes
3answers
6k views

stderr redirection not working in csh

I run the following command: pkg_add emacs-23.4,2.tbz 2> output.log The output still displays in the terminal. When I press ↑, I get pkg_add emacs-23.4,2.tbz 2 > output.log with a space ...
9
votes
3answers
6k views

How to perform GREP on FTP?

I tried searching for similar command in ncftp (actually this is the only terminal ftp client I used) and I didn't find it. What's the way (if possible at all) to use grep command on remote server, ...
1
vote
0answers
224 views

i386 libtool conflicting with x86_64 libtool when installing Handbrake

I've been trying to install Handbrake on centos 5.8 with the help of some different guides. I'm running x86_64, and whenever I try to install packages necessary to build the binary, the arch ends up ...
4
votes
1answer
650 views

Home key acting strange in bash (tty and X) on long input strings

When I hit Home if my current input is short enough (say, <36 characters), it works fine. However, when I've typed a longer command and then want to go back to the beginning, it seems like it does ...
14
votes
7answers
37k views

What is the fastest way to view images from the terminal?

The terminal is very fast and convenient way to quickly access directories and files (faster than find and click on the directory). One thing that it cannot show in text-mode is "pictures". What ...
13
votes
1answer
8k views

ls taking long time in small directory

Running Ubuntu, I open a terminal and do sudo bash cd / ls | head -n 1000 And predictably about 20 directories are returned. However, if I do an ls, and don't pipe it into anything, the ls just ...
4
votes
4answers
1k views

Replace whole line in a file from command-line

I have a text file which has some contents similar to this: # General information about the project. project = u'Py6S' copyright = u'2012, Robin Wilson' # The version info for the project you're ...
1
vote
3answers
189 views

how to forbid a command without a permission

I intended to delete all the backup files in a directory, so I was going to type rm *~ in the terminal. Unfortunately, I hit the Enter before hitting the tilde and unhappy things happened. Although, ...
1
vote
4answers
10k 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? ...
4
votes
1answer
186 views

How can I act on the results of the “locate” command?

I'm trying to find where check_dns is defined in nagios' commands.cfg file, although there are quite a few files. I know I could run something like find / -name "command.cfg" -exec grep check_dns {} ...
5
votes
1answer
321 views

How to replace a symbolic link with an equivalent hard link?

Having a (single, no batch filesystem processing needed) symlink, what a command line to use to turn it into a hard link to the same file?
8
votes
2answers
2k views

How to replace a symbolic link with a copy of a file it links to?

Having a (single, no batch filesystem processing needed) symlink, what a command line to use to replace it with a copy of the file it links to?
2
votes
5answers
595 views

Is it possible to reference the most recently modified file in a command line argument?

I frequently download PDF files with heinous numeric file names from my browser. These automatically go into ~/Downloads. Ideally I would like to just be able to open these files with: evince "the ...
0
votes
1answer
373 views

Postgres 9.0 linux command to windows command conversion [closed]

i am working on an application using delphi 7 as the front end and postgres 9.0 as the back end. I have to upload images to the server so i use \lo_import and \lo_export for inserting images on the ...
18
votes
8answers
1k views

How to tell what type of filesystem you're on?

Is there a command to tell what type of filesystem you're using?
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 ...
2
votes
2answers
318 views

Shell Prompt Customization? [closed]

I have used oh_my_zsh (and tinkered with bash_it) on multiple systems and have generally been happy with it, though I hate it's auto-correction feature and generally turn it off. My usual shell is ...
5
votes
3answers
2k views

How can I get the netmask from an IP address?

How do I get a netmask from the IP address? Is there a command to get it?
3
votes
5answers
523 views

Unix/Linux command syntax

This might come across a completely noob question, but on the other hand this has puzzled me more than a few times or probably I haven't seen enough of linux to draw a pattern. When linux commands ...
74
votes
7answers
31k views

How can I find broken symlinks

Is there a way to find all symbolic links that don't point anywere? find ./ -type l will give me all symbolic links, but makes no distinction between links that go somewhere and links that don't. ...
5
votes
2answers
426 views

How to print Unicode glyph names for input string?

I'd like to be able to run unicode-names 'abç' and see the corresponding Unicode character names: LATIN SMALL LETTER A LATIN SMALL LETTER B LATIN SMALL LETTER C WITH CEDILLA Printing a string as ...
4
votes
1answer
159 views

What is the tool that allows me to specify arbitrary directories using **

I once saw a colleague uses a tool which allows to use ** to represent any directories. For example: if a file called myfile.java sits deep inside: src/main/com/mycompany/product/store/myfile.java ...
17
votes
1answer
1k views

zsh Interpret/ignore commands beginning with '#' as comments

In bash, if I type a command beginning with a '#', bash ignores it as a comment. Ie, the following is ignored at the bash prompt: > # Hi there! Whereas in zsh: > # Hi there ! zsh: bad ...
2
votes
1answer
1k views

Sending some input into a process, then resuming input from command line

I have an interactive terminal program, that accepts stdin (telnet for example). I want to send it some input before interacting with it, like this: echo "Hello" | telnet somewhere 123 But that ...
4
votes
2answers
4k views

How to execute one command on all files within a folder

Saying, I have this tree and I want to execute ruby on all scripts within the folder. How could I archive through one line of command. ./ ../ rb-script/ sample1.rb sample2.rb
4
votes
1answer
498 views

Querying the current time of a city from terminal

I have friends all over the globe and before calling them I need to know their current time. Is there an application in Linux where one can query a city (if exists) in terminal (something like this): ...
7
votes
2answers
65k views

Installing git “sudo: apt-get: command not found”

I am trying to install git. I run the following command: sudo apt-get install git-core git-gui git-doc But receive the following error: sudo: apt-get: command not found What should I do?
3
votes
2answers
507 views

`free`: output format

I use free to get the amount of free space on some of my servers. Its output is something like: $ free -m total used free shared buffers cached Mem: 374 ...
0
votes
0answers
44 views

-d shell script doesn't work [duplicate]

Possible Duplicate: Change directory with -d in shell script I am trying to give the option to the users to run the script in a different directory. However when the script changes the ...
20
votes
3answers
12k views

How to Determine the Amount of RAM Slots In Use?

I forgot how many RAM modules are installed on my laptop. I do not want to unscrew it but want to look it up on the console. How do I gather this information?
13
votes
10answers
1k views

Where do I master the most useful linux commands for programmers? [closed]

The power of combining xargs, cut, tail, grep, seq, amazes me. What resource should I look at for a tutorial on the most useful linux commands for programmers? I'm interested in just the ones ...
1
vote
1answer
99 views

Is “temp” a reserved system name?

I was doing homework on a remote server, and I realized that I had my header and cpp files swapped. So, I wanted to change the names. I began by renaming my header file 'temp'. Then, weird things ...
5
votes
5answers
1k views

Multiple ssh sessions in single command

I'm trying to copy a database from one server to another. I tried using the following command and it's getting tied up on entering the ssh passwords. If I put in one server's password, it complains ...
2
votes
2answers
169 views

Tools that list the prototypes in .so library

Is there a tool that list the prototypes in a .so library. I found nm close to my need, but what I got are just symbols.
0
votes
1answer
126 views

terminal logging doesn't complete when I close the terminal

This is the last line in my .bashrc (lines breaks inserted for readability): STARTTIME=`date +%F-%Hh-%Mm-%Ss-%N`; \ script -q -t 2> /home/USER/logs/$STARTTIME-timing.txt \ -c 'bash --rcfile ...
2
votes
3answers
11k 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 ...
4
votes
2answers
3k views

Why doesn't tar ask before overwriting existing files?

I lost a couple hundred lines of a Vim plugin I wrote and continue back up every so often because I extracted a tar file containing an older version. I decided not to use source control management ...
1
vote
1answer
196 views

egrep command which shows all the authors and subjects of mails contained in a directory

Anyone know of an egrep command which will show the authors and subjects of all mails contained in some directory?
7
votes
2answers
2k views

Number of backslashes needed for escaping regex backslash on the command-line

I recently had trouble with some regex on the command-line, and found that for matching a backslash, different numbers of characters can be used. This number depends on the quoting used for the regex ...
27
votes
3answers
36k 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 ...
24
votes
2answers
3k views

Why is bash's prompt variable called PS1?

The environment variable for the bash prompt is called PS1 (usually set in ~/.bashrc). What does PS1 stand for? Is there a PS2?
3
votes
1answer
2k views

Virtual unix command-line environment on the iPad

Is there a lightweight virtualized Linux or other unix environment that I can run on the iPad? Like VirtualBox for iPad. I only really need a minimal system — something along the lines of Microcore ...