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

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7
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2answers
58k 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
484 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 ...
18
votes
3answers
10k 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?
12
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
166 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
124 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
9k 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 ...
26
votes
3answers
32k 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 ...
19
votes
4answers
18k views

How to attach terminal to detached process?

I have detached a process from my terminal, like this: $ process & That terminal is now long closed, but process is still running and I want to send some commands to that process's stdin. Is ...
4
votes
2answers
1k views

How to search for files by size and extension ?

I want to delete all empty files with a particular extension from a directory and all its subdirectories.
3
votes
9answers
3k views

How to generate a year-quarter date from the command line?

I'm interested in outputting a representation of the current year-quarter, as well as the year-quarter for the previous month. If today is 2012 January 1st, I'd like to get 2012q1 and 2011q4 as ...
23
votes
5answers
19k 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
1answer
183 views

Are there foreign language Terminal command sets?

I recently changed my MacBook's UI to show Hebrew, and at around the same time, I began using the Terminal more often. The combination of the two has lead me to wonder - are there Hebrew language ...
1
vote
1answer
352 views

How to create a cron which finds/kills/clears old puppet runs?

I am a new user of bash/cron, and I was given a task to create a cron which finds/kill/ and clears old puppet runs that were not successfully installed. The more help the better, but I am more or less ...
6
votes
1answer
1k views

How to extract annotations from PDF files?

Is there a command-line tool to extract annotations (comments added using evince) from PDF-files? I search such a solution to send people feedback on their submitted documents. Apart from replying ...
4
votes
4answers
4k views

How can I pass a command line argument into a shell script?

I know that shell scripts just run commands as if they were executed in at the command prompt. I'd like to be able to run shell scripts as if they were functions... That is, taking an input value or ...
3
votes
1answer
4k views

Error in R: Unable to open connection to X11

I just set up a fedora distribution on my computer and am slowly trying to learn how to work from the command line. I was testing R which went fine, except for some reason when I tried again I ...
3
votes
1answer
528 views

Moving through history of commands on command line?

I used to use Up/Down to move through the history of commands. Then, a few days later it changed to Ctrl-p/Ctrl-n. Now this also doesn't work to move through the history of commands entered. How can ...
4
votes
1answer
141 views

If I'm logged in as root, how do I restart mysql or apache with options?

I know the commands to restart/stop/start, but when I try to pass options it doesn't seem to work! CENTOS 6, MySQL 5.14 service mysql restart service httpd restart Then I tried this: ...
63
votes
26answers
11k 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 ...
3
votes
4answers
6k views

Show files from the last 2 days on a mounted ntfs system?

What's exactly the command to show files younger than 2 days? I thought about something like this: $ find / -mtime -2 ...but I'm not sure how to print the date of the found files. My target is to ...
1
vote
1answer
39 views

Why is this flag not working?

Ok so i want to view the ram and have it run continuously root@another:/etc/mysql/database_backups# free -mt total used free shared buffers cached ...
6
votes
2answers
2k views

Problem in secure copying (scp) filenames with spaces

I am trying to copy files using secure copy(scp). I am trying to execute the following command but I get error due to the space in the absolute path of the location of the directory. scp -r -P 8484 ...
4
votes
1answer
755 views

Can you perform system calls from OSX Terminal?

So I get system calls in the context of a C program, but my textbook doesn't really address making system calls in Terminal (on Mac OSX). Can you do these on the command line like with "commands", or ...
9
votes
4answers
1k views

Windows shell Escape key (delete whole line) equivalent in Bash

In Windows command line (powershell and cmd), when you press Esc key while on a line, whatever you have typed at the prompt is removed. I found that pressing Esc key at bash prompt does nothing. ...
2
votes
1answer
442 views

What is the significance of the “1” in ls(1)? [duplicate]

Possible Duplicate: What do the numbers in a man page mean? I see functions referred to with numbers in the parenthesis in documentation. What does this mean? It takes one argument? ...
6
votes
1answer
642 views

Linux user's guide to windows? [closed]

I am a grad student who recently found out that I will have to switch to a Windows box for my research (despite my pleading). I know there are lots of guides out there for Windows users switching to ...
2
votes
2answers
318 views

Simultaneously move long list files to new location

I'm using a wonderful program called ExifTool to recursively rename a large batch of files. Here is example usage: $ exiftool -r -ext JPG '-FileName<CreateDate' -d %Y%m%d_%H%M%S.jpg . Error: ...
14
votes
3answers
11k views

Copy and paste a file/directory from command line

Instead of using the following command: cp {source file} {dest file} I want to be able to copy a file into the clipboard, and paste it somewhere else, in another directory. something like this: ...
3
votes
2answers
822 views

Trying to run oprofile on ubuntu kernel but cannot find vmlinux file

I am trying to run oprofile on my ubuntu host but cannot find the vmlinux file. The set up sfor oprofile needs this file: As given here : ...
16
votes
10answers
14k views

What's a good example of piping commands together?

If you were helping someone to learn the concept of pipes on the command line what example would you use? The example that actually came up was as follows: cat whatever.txt | less I feel like ...
4
votes
2answers
3k views

Running a command on the remote host with interactive SSH (conditionally)

I would like to be able to automatically run a command on a remote host each time I log into that host, but within the current interactive SSH session. Something like ssh user@remotehost [run do.sh] ...
7
votes
1answer
924 views

gvim -p limit of opened tabs?

When I run : gvim -p *.xyz I find that not all files are opened in tabs. It feels, like a kind of tab limit? But ! When I try to open unopened with : :tabnew it is opened next to previous ...
2
votes
0answers
876 views

Using Image Magick Convert to Change Channel Depth?

I want to change an image depth of bitmap for testing purposes. Right now I am trying to get a 2 bit palette image, and a 4444 Hicolor image. I have a true color bitmap. I used the below command ...
9
votes
7answers
8k views

Doing simple math on the command line using bash functions: $1 divided by $2 (using bc perhaps)

Sometimes I need to divide one number by another. It would be great if I could just define a bash function for this. So far, I am forced to use expressions like echo 'scale=25;65320/670' | bc but ...
6
votes
4answers
478 views

extracting certain info from output

I'm trying to extract certain info from ffmpeg output. Sample ffmpeg output: configuration: --enable-memalign-hack --enable-mp3lame --enable-gpl --disable-vhook --disable-ffplay --disable-ffserver ...
7
votes
3answers
8k 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
1answer
740 views

Change xscreensaver lock option command

How could I change the lock option for the xscreensaver from the command line? Been looking around and couldn't find anything about it. xscreensaver-command -lock will lock it right away, which is ...
11
votes
8answers
15k views

What's the quickest way to add text to a file from the command line?

Occasionally I have a thought that I want to write into a file while I am at the terminal. I would want these notes all in the same file, just listed one after the other. I would also like a date / ...
16
votes
4answers
1k views

Copy image from command-line to clipboard

Is there a way in a bash to copy a picture to the clipboard? For example if there is a picture mypic.png I want to have a command like clipcopy mypic.png such that I can go for example to inkscape ...
2
votes
2answers
170 views

Index names of all the files in a plain text file

I've got this directory full of images, and I can do this: echo *.jpg image1.jpg image2.jpg image3.jpg # and so on How can I get the output in a plain text file in this format? image1.jpg ...
1
vote
2answers
327 views

Is there a convenient way to wrap a bash command list into rlwrap?

Thanks to a question on superuser.com, I found out about this utterly convenient rlwrap tool. It satisfies my needs (i.e. add command history to another cmdline tool), but I was wondering how I can ...