A family of Unix-like operating systems using the Linux kernel. If your question is about a certain distribution only, use a more specific tag.

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39
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5answers
22k views

How to use different network interfaces for different processes?

I have two network interfaces on a Linux PC, and I need to manually set the interface that a given process will use. The program (Twinkle softphone) does not have a similar option, so I believe that ...
38
votes
7answers
3k views

How can a Linux OS be “based on” another Linux OS?

I've been looking through quite a number of Linux distros recently to get an idea of what's around, and one phrase that keeps coming up is that "[this OS] is based on [another OS]". For example: ...
38
votes
6answers
27k views

How can I diff two XML files?

On Linux, how could I generate a diff between two XML files? Ideally, I would like to be able configure it to some things strict, or loosen some things, like whitespace, or attribute order. I'll ...
38
votes
3answers
19k views

Does rm -f follow symbolic links?

I have a directory like this: $ ls -l total 899166 drwxr-xr-x 12 me scicomp 324 Jan 24 13:47 data -rw-r--r-- 1 me scicomp 84188 Jan 24 13:47 lod-thin-1.000000-0.010000-0.030000.rda ...
37
votes
2answers
6k views

Why is it so hard to find a file in Ubuntu?

It's very hard to find files in Ubuntu. In Windows, you could just go to C:\Program Files and you would find what you need. In Ubuntu, you must use search to find something you need. Maybe I am ...
37
votes
6answers
35k views

Uploading files to S3 account from linux command prompt

I've got several large files sitting in my linux hosted account that I need to upload to my S3 account. I dont want to download them first and then upload it into S3. Is there any way I can "upload" ...
37
votes
4answers
10k views

Linux equivalent command for “open” command on Mac/Windows?

Coming from Mac OS X, you can type: $ open yourfilehere.txt and your file will open just as if you had opened it from Finder. On Windows, one can type: > start yourfilehere.txt and it will ...
37
votes
3answers
3k views

Say`vimrc`or `screenrc`, what does the `rc` mean?

What does the rc mean?
37
votes
6answers
49k views

How can I view results of my cron jobs?

I see so many guides on how to run crontab, but what I need right now is to learn how to Find log files about cron jobs Configure what gets logged
37
votes
3answers
97k views

How to create a bootable USB from a bootable ISO with the command line on Linux?

I have a CD that's created from an ISO file which I use to install a custom version of Ubuntu via plop linux. The cd works fine but I'd like to use a bootable USB drive instead. I used the command dd ...
37
votes
8answers
10k views

How can I merge the gnome clipboard and the X selection?

I'm constantly frustrated by the two separate clipboards in X/Gnome. I'm constantly doing things like control-C to copy, and then middle-click to paste, and getting the wrong data. Or select ...
36
votes
15answers
45k views

Linux command to repeat a string n times

Is there any built-in Linux command that allows to output a string that is n times an input string??
36
votes
13answers
52k views

In Google Chrome on Linux, where is the flv if not in /tmp?

I like to keep videos because I like buffering them and then playing them back-to-back in my media player, I want to be able to stop/restart my browser without losing all the buffered video, and ...
36
votes
5answers
67k views

How do I get the size of a Linux or Mac OS X directory from the command-line? [duplicate]

What command do I use to find the size of all the files (recursively) in a Linux or Mac OS X directory?
36
votes
4answers
40k views

Find all files on server with 777 permissions

I'm looking for a Linux command to go through all the directories on my server and find all files with 777 permission. The output would be a list of all those files with full path.
36
votes
6answers
25k views

On Linux/Unix, does .tar.gz versus .zip matter?

Cross-platform programs are sometimes distributed as .tar.gz for the Unix version and .zip for the Windows version. This makes sense when the contents of each must be different. If, however, the ...
36
votes
3answers
18k views

Set background image in xmonad

I have just switched from Fluxbox to giving xmonad a go, and I am definitely liking it. However, the one thing I haven't managed to do is to change my desktop background. I am using Ubuntu 8 (uh, ...
35
votes
7answers
69k views

Which is more efficient - tar or zip compression? What is the difference between tar and zip?

I'm working in Linux environment and want to know about tar and zip commands. Which is more efficient - tar or zip? I also need to know the differences between the tar and zip commands. Can anyone ...
35
votes
2answers
24k views

What does Linux do with existing files in a mount point?

If I attempt to mount a folder that already has files in it, does linux give me an error message or go ahead and show both the mounted filesystem and the files that were already in the folder?
35
votes
14answers
18k views

What is Gnome / KDE etc?

I have been on Windows my entire life. Without getting too technical, what are these things? When I search on the net, I get some technical results. I simple do not understand what these things are! ...
35
votes
3answers
75k views

What does /dev/sda for linux mean?

What does : /dev/sda stand for? What does it mean? I have both Fedora and Ubuntu installed and if I explore them using Ext2explore from windows, I see these names : /dev/sda6 /dev/sda9 Please ...
35
votes
3answers
104k views

How does one change user's home directory in Ubuntu 9.04?

Does anyone know how I might change my home directory in the shell please?
35
votes
3answers
30k views

How to join/merge many mp3 files?

Searching Google on how to join/merge many mp3 files, it suggests that I should just cat them together. That might "work", but clearly it is not the correct way to do it, as each header and set of ...
35
votes
3answers
97k views

How can I clear the IP address of Ethernet interface without cycling the interface up/down or restarting it

What is the Linux command to clear IP address of an interface without bringing it down and/or restarting network services. Seems strange ifconfig is able to change IP address but has no option to ...
35
votes
6answers
18k views

Linux: Continuously synchronize files, one way

Scenario: An IDE is set up on a Linux desktop box, editing PHP files locally. Every time I save a file, I want this change to appear on the linux server where Apache is running. The server has ssh ...
35
votes
7answers
32k views

How can I find the oldest file in a directory tree

I'm looking for a shell one-liner to find the oldest file in a directory tree.
35
votes
3answers
35k views

Why is the CPU usage reported by top in Linux over 100%?

I've seen the CPU usage go over 100%. How is this possible? Is it because I have four CPU cores, so 100% isn't really the max? Also, when a program does this, what else can I do in top besides using ...
35
votes
6answers
37k views

recursive grep: exclude specific directories

I use recursive grep a lot to find source files with specific content. grep -Rni "myfunc" . On large codebases, this can get slow, so I use --incldue to restrict/whitelist extensions. grep -Rni ...
35
votes
8answers
8k views

How do you track which packages were installed on Ubuntu (Linux)?

(This question is very similar to 10458. It was suggested that Fedora and Ubuntu/Debian are different enough to warrant different answers.) As I use any Ubuntu setup I gradually install a number of ...
35
votes
5answers
111k views

How to access a BitLocker-encrypted drive in Linux?

I have a laptop running Windows 7 Ultimate. I have encrypted my drives using BitLocker. Now I have also installed Lubuntu along with Windows. But my encrypted drives are not visible in Linux. How ...
35
votes
1answer
41k views

Show only current directory name (not full path) on bash prompt

The way my bash prompt is currently configured, it shows the whole path to the current directory. This is annoying when I'm deep inside a directory tree, as the prompt becomes so long that every ...
35
votes
4answers
3k views

Palindrome passwords disallowed—why?

I tried to change a Linux password to "sitonapotatopanotis" and got this error: BAD PASSWORD: is a palindrome Why does this rule exist?
34
votes
12answers
4k views

How do I remove a file in Linux whose name looks like it's ONLY a hyphen, as in “-”

I've tried rm -- - rm "-" rm "\-" rm \- Gave Perl a shot ~$ perl -e '$junk = glob("-"); chomp $junk; print "$junk\n"; `rm $junk`;' - rm: cannot remove `-': No such file or directory ...and... ...
34
votes
3answers
5k views

Have a file named ~ (tilde) in my home-directory

I just noticed that I have a file called ~ in my ~-directory. $ ls -la ~ ... -rw-r----- 1 x1 x1 733962240 Mar 1 17:55 ~ ... Any idea how I can mv or rm it?
34
votes
2answers
4k views

How come one user can delete another user's 755 files?

I have a backup upload script that scp’s files to another server using the user upload. Another script on the target server then chown’s these to another user and sets the file mode to 755. If I then ...
34
votes
2answers
36k views

List files bigger than filesize specified

How can I make ls (or any other particular command) to list me only files bigger than a specific file size?
34
votes
3answers
39k views

Get home directory by username

I want to obtain home dir of any user with echo echo ~puchuu >> /home/puchuu But I cant use variable echo ~$USER >> ~puchuu echo `echo ~$USER` >> ~puchuu
34
votes
6answers
69k views

Bash script to delete files older than x days with subdirectories

I'm trying to delete a ton of files older than x days. Now I have a script to do that find /path/to/files* -mtime +10 -exec rm {} \; But this will also delete the subdirectories. There are a ton ...
34
votes
1answer
56k views

What is the difference between grep, pgrep, egrep, fgrep?

I'd like a walk through on the differences between grep, pgrep, egrep, and fgrep and how I would use them.
34
votes
6answers
2k views

A more comfortable way to edit a long $PATH?

I want to add, in ~/.bashrc, a few directories to my $PATH. My $PATH is quite long so it's a bit hard to see what directories it contains and in what order. I know I can modify my ~/.bashrc to be: ...
34
votes
2answers
96k views

What do ALSA devices like “hw:0,0” mean? How do I figure out which to use?

I've searched over and over and can't find any explanation of what "hw:0,0" means. How do I determine the number of my USB audio card? MPD requires me to enter something like this: audio_output { ...
34
votes
3answers
15k views

Bad font anti-aliasing in Ubuntu

I'm switching from Fedora 8 to Ubuntu 9.04, and I can't seem to get it to get a good font anti-aliasing to work. It seems that Ubuntu's fontconfig tries to keep characters in integral pixel widths. ...
33
votes
2answers
64k views

Updating Time : ntpdate[3108]: the NTP socket is in use, exiting

The time on my system is incorrect for some reason. i need to run an update but i can't seem to be able to this is the errror. ntpdate pool.ntp.org 31 Aug 12:31:59 ntpdate[3108]: the NTP socket is in ...
33
votes
6answers
83k views

play mp3 or wav file via Linux command line

I would like to make an alarm system backed by a Ubuntu (no graphical interface) box, which plays various announcement and alarm audio tracks (.mp3 or .wav) via the command line. For example: $ ...
33
votes
7answers
44k views

ls -d is not displaying directories. Is there a way to get ls to only display directories instead of files and directories

Is there a way to get ls to only display directories instead of files and directories From the man page. -d, --directory list directory entries instead of contents, and do not ...
33
votes
5answers
137k views

How to reinstall GRUB2 EFI?

After successfully updating my bios, something went wrong and I ended up with a blinking cursor on the top left corner of a black screen. No errors, no nothing. The bios now only listed a SATA: ...
33
votes
10answers
61k views

How do I move files and directories to the parent folder in Linux?

In Linux (Ubuntu), how do you move all the files and directories to the parent directory?
33
votes
2answers
112k views

Creating ext4 partition from console

I have a volume /dev/sda1 (1.2 TB) containing an NTFS partition using 0.6 TB space. I want to make an ext4 partition in the remaining 0.6 TB space. I have not tried anything yet because I don't want ...
33
votes
5answers
53k views

Good block size for disk-cloning with diskdump (dd)

I use dd in its simplest form to clone a hard drive: dd if=INPUT of=OUTPUT However, I read in the manpage that dd knows a blocksize parameter. Is there an optimal value for the blocksize parameter ...
33
votes
5answers
230k views

How can I resolve the error “cannot execute binary file”?

When I login using SSH, all I can see is this... -bash: /usr/bin/id: cannot execute binary file -bash: [: : integer expression expected I couldn't do anything in here. Commands such as halt, ...