Super User
Super User

Most Popular

more tags
1500 questions
93
votes
6 answers

Opposite of tail: all lines except the last n lines

How can I discard the last n lines of a file with a unix command line filter? That would be sort of the opposite of tail: tail discards the first n lines but pipes the rest through, but I want the command to pipe everything through except the last n…
Dr. Hans-Peter Störr
  • 2,339
93
votes
4 answers

How does the computer know that the PC was not properly shut down?

Actually, this question struck me because of power cuts in my house. When there is a power cut, there is a sudden loss of power from the computer. How does the computer know that the shutdown was not properly done?
FrozenKing
  • 1,410
  • 4
  • 23
  • 35
93
votes
6 answers

Verifying USB connection speed (USB 3 or USB 2?)

I've purchased several new USB 3 capable drives to use with my new (USB 3 capable) laptop. They connect ok but I suspect they're silently falling back to USB 2. The sustained transfer rates I'm seeing are around 30 Mb/s for both reads and writes,…
Molomby
  • 1,945
93
votes
4 answers

Disable a Windows service from the command line

I want to disable a Windows service but I don't want to: Open the "Services" management console Scroll to the name of the service Right-click Properties (or double-click) Change the Startup Type: to disabled Apply Click "Stop" I don't want to…
Kevin Driedger
  • 3,171
93
votes
11 answers

Can I force Google Chrome to remember passwords?

Is there a way to force Google Chrome to remember passwords for sites that have autocomplete turned off? Clarification: I am a programmer, but ideally, I'd like a method that I could help regular users implement, too.
Nathan Long
  • 27,435
93
votes
9 answers

How can I remap a keyboard key?

One of my laptop's keys has fallen off. Is there any way I can remap another key to serve as that key? I'll 'sacrifice' the other key because I never use it.
Pure.Krome
  • 1,933
93
votes
5 answers

What is the difference between a VLAN and a subnet?

I have read numerous forums and articles regarding VLANs and subnets. However, I haven't understood the functions of each apart from the following: Subnets allow the segmentation of a network VLANs are an isolated portion of a…
PeanutsMonkey
  • 9,380
93
votes
20 answers

Can some software physically damage hardware?

I know a question similar to this one has been asked before however it was about installing a 32bit OS on a 64bit laptop. My question is more about damaging the hardware. I was wondering if there was a way of interfacing with hardware from the OS or…
nopcorn
  • 16,982
93
votes
20 answers

How can I dim my computer screen beyond the minimum?

I usually just use Fn + Left or Fn + Right to adjust my screen's brightness but the minimum settings are still too bright for me (especially when I'm working at night). I tried going through the Power Options in the Control Panel (plan brightness…
Ellesa
  • 11,185
93
votes
5 answers

Permission denied when accessing VirtualBox shared folder when member of the vboxsf group

I'm running Ubuntu 11.04 (guest) on Windows 7 (host) with the guest additions installed. I have an auto-mount folder that maps to my D: drive on the host which I can access using sudo ls /media/sf_D_DRIVE - however, even when my user (ross) is a…
Ross
  • 3,298
93
votes
9 answers

Move WSL2 file system to another drive

As opposed to in WSL1, official docs for WSL2 state clearly that I should place files I access frequently from Linux under the Linux file system. However, I have not found any docs on settings for where inside the Windows file system the Linux file…
Tomas Aschan
  • 3,556
93
votes
4 answers

How to make new file permission inherit from the parent directory?

I have a directory called data. Then I am running a script under the user id 'robot'. robot writes to the data directory and update files inside. The idea is data is open for both me and robot to update. So I setup the permission and owner group…
Wai Yip Tung
  • 1,031
  • 1
  • 8
  • 5
93
votes
4 answers

What is the difference between pressing Alt+Tab and Ctrl+Alt+Tab?

When I press Alt+Tab, then I get a window to switch between windows. With Ctrl+Alt+Tab, I get the same result. What is the difference between them?
wasif
  • 9,176
93
votes
6 answers

How to ignore a tracked file in git without deleting it?

My team uses sourcetree as our git client. There is a third-party plugin in our project. It needs several configuration files. These files cannot be generated automatically. They store account name, login tokens and some temporary options, which…
Liz
  • 1,031
93
votes
1 answer

Pressing "Ctrl + S" by mistake while using Vim

If you press Ctrl + s while using vim would result with vim to look like as if it is being locked/stuck without you being able to make more changes unless you press Ctrl + q. Could someone explain what is happening and why? Hint - it might be…
dankilev
  • 1,051
  • 1
  • 8
  • 9
1 2 3
…
99 100