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2388 votes
7 answers
3.0m views

How do I make a POST request using curl?

How do I make a POST request using cURL's command-line tool?
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2129 votes
3 answers
247k views

Why does Windows think that my wireless keyboard is a toaster?

I've inherited an old PC from my girlfriend's dad and when setting up the printer I got a bit of a surprise: Two questions spring to mind here: Why does Windows think my wireless keyboard is a ...
user avatar
  • 11.6k
1789 votes
14 answers
1.2m views

How do I scroll in tmux?

How do I scroll with either the keyboard or mouse? The tmux man page indicates one must enter copy-mode to scroll. Is there a way to quickly scroll without manually entering copy-mode?
user avatar
  • 18.1k
1642 votes
10 answers
1.4m views

How can I sort the output of 'ls' by last modified date?

How can I sort the output of ls by last modified date?
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1572 votes
6 answers
162k views

How do I make a machine "blank screen" for a period of time (as a penalty) if certain noise levels are reached?

My kids (4 and 5) yell a lot when playing games on the computer. I found an effective cure for this. When I hear loud noises, I ssh into the game computer and do: chvt 3; sleep 15; chvt 7 This ...
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1220 votes
17 answers
1.7m views

Getting curl to output HTTP status code?

I'm using curl at the command line on Linux to issue HTTP requests. The response bodies are printed to standard out, which is fine, but I can't see from the man page how to get curl to print the ...
user avatar
  • 12.9k
1093 votes
12 answers
1.4m views

Find out which process is locking a file or folder in Windows

How can I find out which process is locking a file or folder in Windows? For instance, when trying to delete a folder, Windows reports this: The action can't be completed because the folder is ...
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  • 19.7k
1033 votes
17 answers
981k views

How to clear/flush the DNS cache in Google Chrome?

As you probably know Google Chrome has its own internal DNS cache. Is there a way to clear it without having to wait for the time out or close the browser?
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  • 10.5k
994 votes
19 answers
514k views

What are the Windows A: and B: drives used for?

In Windows you have a C-drive. Everything labeled beyond that is with the following letter. So your second drive is D, your DVD is E and if you put in a USB stick it becomes F and the following ...
987 votes
25 answers
1.1m views

How to tell git which private key to use?

ssh has the -i option to tell which private key file to use when authenticating: -i identity_fileSelects a file from which the identity (private key) for RSA or DSA authentication is read.  The ...
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  • 11.2k
854 votes
3 answers
174k views

Transatlantic ping faster than sending a pixel to the screen?

John Carmack tweeted, I can send an IP packet to Europe faster than I can send a pixel to the screen. How f’d up is that? And if this weren’t John Carmack, I’d file it under “the interwebs being ...
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801 votes
31 answers
973k views

Is there a built-in checksum utility on Windows 7?

Is there a built-in checksum/hash utility on Windows 7?
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  • 8,337
718 votes
12 answers
719k views

What does 'source' do?

$ whatis source source: nothing appropriate. $ man source No manual entry for source $ source bash: source: filename argument required source: usage: source filename [arguments] It exists, and it is ...
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  • 7,820
710 votes
9 answers
556k views

How to recursively chmod all directories except files?

How to chmod 755 all directories but not files (recursively)? Inversely, how to chmod only files (recursively) but no directories?
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697 votes
5 answers
99k views

Why does this PNG image display differently in Chrome & Firefox than in Safari and IE?

Check this image out: On Chrome and Firefox it will show as a pear. Now, try to save it and look at it saved on your desktop. Also, try viewing in Safari or Internet Explorer. It will display as ...
user avatar
  • 3,699
689 votes
14 answers
265k views

macOS keeps asking my ssh passphrase since I updated to Sierra

It used to remember the passphrase, but now it's asking it to me each time. I've read that I need to regenerate the public key with this command, which I did: ssh-keygen -y -f id_rsa > id_rsa.pub ...
user avatar
  • 7,011
682 votes
18 answers
81k views

How are pseudorandom and truly random numbers different and why does it matter?

I've never quite got this. Just say you write a small program in any language at all which rolls some dice (just using dice as an example). After 600,000 rolls, each number would have been rolled ...
674 votes
8 answers
2.0m views

How can I display the contents of an environment variable from the command prompt in Windows 7?

In Windows 7, when I start the Command prompt, is there any command to display the contents of an environment variable (such as the JAVA_HOME or PATH variables)? I have tried with echo $PATH, echo ...
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  • 25k
633 votes
19 answers
378k views

How to *disable* automatic reboots in Windows 10?

Windows 10 lets you 'schedule' a reboot for later. I want to disable it. Evidently Windows scheduled itself for a reboot last night when I wasn't looking and just closed everything I had been working ...
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  • 11.4k
625 votes
5 answers
814k views

How can I get the same SSID for multiple access points?

I need to upgrade my existing wireless infrastructure and this time I want 2 access points to cover my house, since I get blind spots no matter what with a single AP. I have physical cabling to my ...
user avatar
  • 6,647
606 votes
12 answers
643k views

View list of files in ZIP archive on Linux

How can I view the list of files in a ZIP archive without decompressing it?
user avatar
  • 6,603
597 votes
11 answers
226k views

From a quality perspective, what is better: turning volume up in the software, in the OS, or on the speakers?

If music isn't loud enough, how do I get the best quality (even if the difference is in fact so small it's negligible)? By making the music louder in my music player, game or other sound-producing ...
user avatar
  • 4,317
596 votes
40 answers
472k views

How to execute a command whenever a file changes?

I want a quick and simple way to execute a command whenever a file changes. I want something very simple, something I will leave running on a terminal and close it whenever I'm finished working with ...
user avatar
590 votes
15 answers
612k views

How to copy with cp to include hidden files and hidden directories and their contents?

How can I make cp -r copy absolutely all of the files and directories in a directory Requirements: Include hidden files and hidden directories. Be one single command with an flag to include the ...
user avatar
  • 14.7k
584 votes
5 answers
272k views

How do you reload your .vimrc file without restarting vim?

Can you edit your .vimrc file and reload it without having to restart Vim?
user avatar
  • 5,951
575 votes
22 answers
250k views

How do I reorder tmux windows?

In screen, I can just type C-a :number 0 to move a window to the top of the window list and push all the other windows down one. What's the equivalent command sequence for tmux? I looked at the man ...
user avatar
  • 6,757
571 votes
10 answers
790k views

How to stop an automatic redirect from “http://” to “https://” in Chrome

I had something set up wacky in our DNS setup which is now resolved. The remaining problem is that chrome has cached the incorrect setup. Specifically, when using Chrome http://example.com is now ...
user avatar
  • 5,819
565 votes
13 answers
462k views

How do I convert a video to GIF using ffmpeg, with reasonable quality?

I'm converting a video to GIF file with ffmpeg: ffmpeg \ -i input.flv \ -ss 00:00:00.000 \ -pix_fmt rgb24 \ -r 10 \ -s 320x240 \ -t 00:00:10.000 \ output.gif It works great, but output ...
user avatar
563 votes
8 answers
675k views

Permissions on private key in .ssh folder?

I changed my permissions in my .ssh folder and now when I use a piece of software that uses my private key, I have to type my password each time. What should my permissions be on my id_rsa file to ...
user avatar
562 votes
13 answers
3.3m views

Windows 7 SP1 Windows Update stuck checking for updates

I installed Windows 7 fresh and installed SP1. Now, when I try to check manually for Windows Updates it just hangs on the Checking for updates screen. I tried running the tools in How do I reset ...
user avatar
544 votes
5 answers
1.3m views

How to find a directory on linux?

I have a VPS with Suse Linux 10.3. I've logged in via SSH/putty and am trying to find where my web files are located. Since I'm uploading via FTP in a directory called httpdocs, I assume that this ...
user avatar
538 votes
8 answers
715k views

Using ffmpeg to cut up video

I am using ffmpeg to cut out a section of a large file like this: ffmpeg -i input.wmv -ss 60 -t 60 -acodec copy -vcodec copy output.wmv The -ss part works fine but the -t is ignored. It correctly ...
user avatar
  • 5,509
537 votes
6 answers
192k views

Difference between .bashrc and .bash_profile

What's the difference between .bashrc and .bash_profile and which one should I use?
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  • 8,763
532 votes
7 answers
680k views

What is the "You have new mail" message in Linux/UNIX?

Sometimes, when I log into a box and 'su' to root, I get a cute little message saying I have mail (thank GOD it's not AOL). Where is this mail? What does it contain? Who/What sent it? How important ...
user avatar
  • 15.9k
525 votes
4 answers
189k views

How to turn off word-wrap in less

Short version: How can I make the less utility in Linux not wrap lines? Long version: Often I need to view huge CSV files using less with hundreds of columns. I frequently only care about the first ...
user avatar
  • 8,662
522 votes
17 answers
279k views

When reading a file with `less` or `more`, how can I get the content in colors?

When I read a file in Linux with the command less or more, how can I get the content in colors?
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  • 7,523
519 votes
12 answers
504k views

Automatically answer 'Yes' when using apt-get install

Is there a way to make apt-get install answer "yes" to the "Do you want to continue [y/N]?"?
user avatar
  • 6,167
516 votes
3 answers
336k views

"directory junction" vs "directory symbolic link"?

In the context of NTFS: MKLINK [[/D] | [/H] | [/J]] Link Target /D Creates a directory symbolic link. Default is a file symbolic link. /H Creates a hard link instead of a symbolic link. /J ...
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  • 25.6k
511 votes
12 answers
299k views

Create/rename a file/folder that begins with a dot in Windows?

Many programs needs folder names that starts with a dot, like .emacs.d, .gimp-2.2, .jedit etc. How do I create such a folder? When using the Windows Explorer in Windows 2000 (and other versions), I ...
user avatar
507 votes
9 answers
56k views

Did I just get hacked?

I am developing a consumer product, and it is supposed to be connected to the Internet, so as expected, it is connected to the Internet so that I can properly develop it. I went away for an hour or ...
user avatar
  • 3,519
505 votes
7 answers
58k views

How does a computer restart itself?

How can a computer restart itself? After it's off, how does it tell itself to come back on again? What kind of software is it that can do this?
user avatar
504 votes
16 answers
380k views

Reload a Linux user's group assignments without logging out

When assigning a user's secondary group list using: # usermod -G <grouplist> <user> is it possible to force this group assignment to take effect without logging out all running sessions? ...
user avatar
  • 5,522
495 votes
17 answers
792k views

Is there any 'sudo' command for Windows?

I always work on a non-administrator account on my Windows computer. Sometimes I need to install programs which requires administrator access. As I mostly use the Windows command prompt, is there a ...
user avatar
  • 10.5k
491 votes
6 answers
1.1m views

How to decompress a .bz2 file

I have a file as: filename.bz2 I need to decompress. I have tried the command: tar xvjf filename.tar.bz2, but it didn't work as the file is not a tar file. How do I decompress this file?
user avatar
  • 5,055
486 votes
9 answers
725k views

Can I delete the folder C:\ProgramData\Package Cache\?

There is a new folder full of installers located at C:\ProgramData\Package Cache\. I believe this is from Visual Studio 2012 RC. Can I delete these gigabytes of data without consequences? Are they ...
user avatar
  • 5,230
477 votes
20 answers
362k views

How can I make Chrome stop caching redirects?

I am working on a web application that is using redirects (for pretty URLs). I am trying to debug logic in the way the redirects are working. However Google Chrome keeps remembering the redirects and ...
user avatar
  • 8,134
476 votes
14 answers
86k views

Does e-mail address obfuscation actually work? [closed]

Most of the time when I see someone post their email address online, especially if it's a personal address, they use something like me [at] example [dot] com instead of the actual email address (me@...
user avatar
  • 7,329
473 votes
14 answers
416k views

How do I make rm not give an error if a file doesn't exist?

I'm writing a makefile that will clean up some useless files at the end of the compilation. If a target has already been made, it will of course skip that target and the useless file may not be there....
user avatar
  • 7,762
471 votes
5 answers
583k views

How do I run multiple commands on one line in PowerShell?

In a cmd prompt, you can run two commands on one line like so: ipconfig /release & ipconfig /renew When I run this command in PowerShell, I get: Ampersand not allowed. The `&` operator is ...
user avatar
  • 8,474
465 votes
18 answers
318k views

How can I remove malicious spyware, malware, adware, viruses, trojans or rootkits from my PC?

What should I do if my Windows computer seems to be infected with a virus or malware? What are the symptoms of an infection? What should I do after noticing an infection? What can I do to get rid of ...

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