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2425 votes
7 answers
3.1m views

How do I make a POST request using curl?

How do I make a POST request using cURL's command-line tool?
user avatar
2152 votes
3 answers
252k 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 ...
ydaetskcoR's user avatar
  • 11.8k
1996 votes
15 answers
1.6m 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?
chadoh's user avatar
  • 20.1k
1741 votes
10 answers
1.6m 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?
user avatar
1582 votes
6 answers
164k 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 ...
Leonid Volnitsky's user avatar
1453 votes
19 answers
2.4m 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 ...
kdt's user avatar
  • 15.3k
1280 votes
16 answers
1.8m 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 ...
leeand00's user avatar
  • 22.7k
1154 votes
25 answers
1.5m 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 ...
jrdioko's user avatar
  • 12.9k
1067 votes
17 answers
1.1m 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?
Mee's user avatar
  • 10.8k
1004 votes
20 answers
523k 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 ...
861 votes
3 answers
178k 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 ...
Konrad Rudolph's user avatar
805 votes
31 answers
993k views

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

Is there a built-in checksum/hash utility on Windows 7?
user64996's user avatar
  • 8,407
798 votes
13 answers
855k 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 ...
Andrea Ambu's user avatar
  • 8,648
798 votes
8 answers
2.6m 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 ...
Jonas's user avatar
  • 27.8k
781 votes
10 answers
637k 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?
Olivier Lalonde's user avatar
758 votes
15 answers
322k 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 ...
erwan's user avatar
  • 7,701
703 votes
12 answers
791k 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?
johnlemon's user avatar
  • 7,583
701 votes
5 answers
101k 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 ...
ethree's user avatar
  • 3,739
684 votes
18 answers
84k 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 ...
668 votes
18 answers
761k 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 ...
eleven81's user avatar
  • 15.7k
664 votes
16 answers
638k 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 ...
Kamil Hismatullin's user avatar
662 votes
20 answers
392k 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 ...
mpen's user avatar
  • 12.2k
655 votes
11 answers
1.1m 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 ...
phil swenson's user avatar
  • 6,659
647 votes
24 answers
323k 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 ...
dan's user avatar
  • 7,487
646 votes
7 answers
926k 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
644 votes
41 answers
559k 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 ...
Denilson Sá Maia's user avatar
640 votes
5 answers
862k 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 ...
krosenvold's user avatar
  • 6,807
626 votes
5 answers
1.6m 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 ...
Edward Tanguay's user avatar
607 votes
11 answers
259k 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 ...
Qqwy's user avatar
  • 4,447
603 votes
15 answers
356k 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?
Open the way's user avatar
  • 8,733
600 votes
5 answers
287k 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?
ivo's user avatar
  • 6,111
599 votes
9 answers
832k 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 ...
Neil's user avatar
  • 6,119
589 votes
12 answers
638k views

Automatically answer 'Yes' when using apt-get install

Is there a way to make apt-get install automatically choose "yes" upon the Do you want to continue [y/N]? confirmation dialog?
mistiry's user avatar
  • 6,887
579 votes
7 answers
772k 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 ...
nopcorn's user avatar
  • 16.7k
574 votes
16 answers
489k 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? ...
Simon's user avatar
  • 6,232
573 votes
12 answers
337k views

Can I make cURL fail with an exitCode different than 0 if the HTTP status code is not 200?

I was always assuming that when curl got an HTTP 500 response it was returning an exit code that meant failure (!= 0), but that seems to be not the case. Is there a way I can I make cURL fail with an ...
knocte's user avatar
  • 6,031
572 votes
4 answers
225k 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 ...
User1's user avatar
  • 9,422
569 votes
3 answers
410k 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 ...
Pacerier's user avatar
  • 27.4k
568 votes
6 answers
209k views

Difference between .bashrc and .bash_profile

What's the difference between .bashrc and .bash_profile and which one should I use?
cfischer's user avatar
  • 9,093
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 ...
Mikey A. Leonetti's user avatar
560 votes
5 answers
786k 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 ...
David's user avatar
  • 9,444
547 votes
14 answers
524k 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....
Jason Baker's user avatar
  • 8,662
540 votes
6 answers
570k views

Remove audio from video file with FFmpeg

How can I strip the audio track out of a video file with FFmpeg?
TeAmEr's user avatar
  • 5,647
535 votes
6 answers
1.3m 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?
Jury A's user avatar
  • 5,495
523 votes
8 answers
899k views

How to remove systemd services

If I install a new service then decide I don’t want that application anymore and delete it, the service is still listed in the output from systemctl as error. Where is this coming from and how can I ...
eMeL's user avatar
  • 5,331
520 votes
15 answers
817k views

How to fix warning about ECDSA host key

I'm trying to setup password-less SSH on an Ubuntu server with ssh-copy-id myuser@myserver, but I'm getting the error: Warning: the ECDSA host key for 'myserver' differs from the key for the IP ...
Cerin's user avatar
  • 9,242
516 votes
12 answers
310k 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
509 votes
19 answers
876k 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 ...
ukanth's user avatar
  • 10.7k
509 votes
9 answers
806k 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 ...
Ben L's user avatar
  • 5,460
508 votes
15 answers
2.5m views

How to enable execution of PowerShell scripts?

When I try to execute my PowerShell script I get this error: File C:\Common\Scripts\hello.ps1 cannot be loaded because the execution of scripts is disabled on this system. Please see "get-help ...
Pavel Chuchuva's user avatar

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