81
votes
6answers
82k views

How to install rmagick on Ubuntu 10.04?

Here's what I've done so far: sudo apt-get install imagemagick libmagickcore-dev This did not throw any errors, so I think that ImageMagick is installed fine. Then I tried installing the gem: sudo ...
81
votes
9answers
242k views

What can I do if I forgot my Windows 7 password?

I got a brand new Windows 7 machine, installed the operating system, created one account and forgot its password. What can I do? There is no external CD, the operating system is loaded from somewhere ...
81
votes
12answers
264k views

How do I compare two Excel documents? [closed]

The compare function in Word 2007 is very handy -- is there a similar capability in Excel 2007? I can't seem to find it... The documents I'm trying to compare are essentially two versions of the same ...
80
votes
7answers
5k views

Why do some RJ45 plugs have the lock release clip under a rubber cover?

Some RJ45 plugs have an exposed lock release clip, like this: However, others place the release clip under a rubber cover, like this: I find that the rubber cover is almost never anything but a ...
80
votes
8answers
31k views

Running upstart jobs as unprivileged users

What's the canonical way to have an upstart job change its userid and run the script as an unprivileged user? Obviously one can use su or sudo, but this seems hacky (and can generate needless log ...
80
votes
7answers
26k views

How do I get rid of all caps ribbon titles in Office 2013?

Installed Office 2013 on Windows 8 today. It's great, except for one thing, the all caps ribbon titles are inconsistent with the title case titles everywhere else in Windows 8. Is there a registry ...
80
votes
1answer
9k views

Windows 7 and Vista Activation FAQ: How do language, version, 64-bit or 32-bit, and source affect ability to install and transfer Windows licenses?

We get a lot of questions on Super User about Windows activation and licensing. This question is an attempt to answer the most common questions in one place with a canonical answer. When ...
79
votes
3answers
5k views

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 ...
79
votes
4answers
64k views

Can a 32-bit OS machine use up all 8GB RAM + 20GB page file?

What I understand about 32-bit OS is, the address is expressed in 32 bits, so at most the OS could use 232 = 4G memory space -- I assume the unit is bytes, so 4GB. Does this mean if any machine with ...
79
votes
2answers
6k views

How do web-servers “listen” to IP addresses, interrupt or polling?

I'm trying to understand the lower details of web servers. I am wondering if a server, say Apache, is continuously polling for new requests or If it works by some sort of interrupt system. If it is an ...
79
votes
4answers
9k views

Why can't you uninstall multiple programs at once in Windows?

Why won't Windows allow you to uninstall or remove multiple programs at once? What is the reasoning behind this? Will it mess up an internal system? I am not looking for how to uninstall multiple ...
78
votes
13answers
161k views

How to move windows that open up offscreen?

I have a dual monitor setup, and I recently played around with the positioning settings, and some of my single window applications do the favour of preserving where they were last closed, and opening ...
78
votes
6answers
190k views

How can I give write-access of a folder to all users in linux?

I installed apache2 on Ubuntu just now, and noticed that the /var/www folder is protected. I can just sudo everything but I would rather just give it write access. How can I do this? I tried sudo ...
78
votes
7answers
5k views

Why are special characters such as “carriage return” represented as “^M”?

Why is ^M used to represent a carriage return in VIM and other contexts? My guess is that M is the 13th letter of the Latin alphabet and a carriage return is \x0D or decimal 13. Is this the reason? ...
78
votes
7answers
224k views

How can I read my hard drive's SMART status in Windows 7?

Is there a tool, application, gadget or similar which lets me read the S.M.A.R.T. state of my HDDs while using Windows 7? Ideally, it should be something that can monitor my HDD temperature ...
77
votes
9answers
6k views

Why does RAM have to be volatile?

If computer RAM was to be non volatile like other persistent storages, then there would be no such thing as bootup time. Then why is it not feasible to have a non volatile ram module? Thank you.
77
votes
7answers
12k views

Is CRT degaussing really dangerous for nearby laptops?

I have an old CRT connected to laptop as a secondary display. As you know, when CRT turns on it degausses itself; remember that sound when you turn it on, or force degaussing through menu. CRTs ...
77
votes
5answers
74k 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 ...
77
votes
9answers
20k views

How can I wipe a broken hard disk drive before sending it back to the manufacturer for maintenance?

The hard drive of my laptop died, the manufacturer wants me to send it so that they can investigate, but I'm concerned that the drive might contain sensitive information. When I say the drive is ...
77
votes
10answers
185k views

How do I get an entire directory in sftp?

I'm just learning to use sftp, and I want to copy a directory from the remote computer to my local computer. If I try get [directory] it gives me this error: Cannot download non-regular file: ...
77
votes
17answers
8k views

Convincingly “breaking” a system for a non technical user [closed]

For various reasons out of scope for Super User, I've been tasked with temporarily disabling one of my own systems. I have full admin control and own this system. It’s running Windows 7 SP1. I want to ...
77
votes
5answers
131k views

How to recursively delete directory from command line in windows?

Is there a windows equivalent of sudo rm -r [directory-name]?
77
votes
5answers
18k views

How can I find out where an email really came from?

How can I know where an Email really came from? Is there any way to find it out? I have heard about email headers, but I don't know where can I see email headers, in Gmail, for instance. Any help?
77
votes
7answers
29k views

Mac OS X equivalent of the Ubuntu “tree” command

Is there any equivalent of the Ubuntu tree command for Mac OS X ?
77
votes
5answers
26k views

Restore tmux session after reboot

Is there any way to save a tmux session? In other words, if I reboot the computer, will I always lose the sessions?
77
votes
4answers
70k views

VirtualBox shared clipboard?

Where is the configuration option for sharing clipboards (copy & paste) between the host OS and the guest OS?
77
votes
2answers
51k views

How do you run a SSH server on Mac OS X?

How do you run a ssh server on Mac OS X?
77
votes
6answers
10k views

How is the capacity of a harddisk faked?

I was reading about magical Chinese drives. How would this be done? The post talks about a 'looped mode' and comments suggest having a different controller to lie to the OS. I went and bought one of ...
76
votes
15answers
41k views

Can AVI files contain a virus?

I'm downloading an AVI file via a torrent, but my anti-virus detects something. Is it possible that the AVI file contains a virus? It is quite weird since the torrent has many positive reviews.
76
votes
11answers
44k views

Undo an “rm -rf ~” command?

I had a folder I didn't want named '~', so from the command line I typed rm -rf ~ and accidentally deleted my home folder (since ~ resolved to /home/username). Is there any way back or do I ...
76
votes
8answers
35k views

How can I search the bash history and rerun a command?

Can I search history in bash and run the result?
76
votes
18answers
19k views

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 ...
76
votes
1answer
21k views

tmux - How do I rename a session?

When I first started using tmux, I didn't give my first session a name. Then, as I started creating different sessions for different tasks (work, play, etc), I started naming my sessions. Now I have ...
76
votes
7answers
42k views

Turn on the link hover statusbar in Google Chrome

I want to turn on the feature where whenever I hover over a hyperlink and in the bottom lefthand corner it shows a light blue hover tooltip about where that link goes. It looks like that since some ...
76
votes
11answers
10k views

What's an efficient way to change my 200+ account passwords?

I have a lot of online accounts, web services, and so on -- personal as well as business -- so obviously(?) I use a password manager to handle them all. Specifically I use Lastpass but my question ...
76
votes
5answers
34k views

Aptitude vs. apt-get: Which is the recommended (aka the “right”) tool to use?

Some time ago I read that aptitude is the preferred tool for installation on Debian-based systems. But when you search around on how to administer a Debian-based system, then aptitude is rarely ...
75
votes
6answers
57k 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 ...
75
votes
7answers
81k views

Can I delete the 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. Does anyone know if I can delete these GB of data without ...
75
votes
7answers
65k views

Is it possible to install Windows 8 using Microsoft Virtual PC?

I'm trying to install Windows 8 on my pc via Microsoft Virtual PC. However I get this annoying, non-descriptive error: I'm looking to find out if Microsoft Virtual PC supports Windows 8, and if so ...
75
votes
4answers
23k views

What is the difference between shell, console, and terminal?

I'm confused with the terminology. What is the difference between shell, console, and terminal?
74
votes
13answers
176k views

“Show desktop” keyboard shortcut in Mac OS X

I am using a MacBook Pro with Mac OS X 10.5. Is there a similar function to "show desktop" (shortcut is WindowsD) on a Mac?  It should hide all applications and show a clean desktop.
74
votes
4answers
43k views

Chrome: remove URL from autocomplete which doesn't show up in history?

I accidentally visited gist.gihub.com (note the missing t), and now that URL auto completes each time I start typing gist.…. How can I remove this URL? I've tried removing it from my history, but ...
74
votes
1answer
95k views

What is port forwarding and what is it used for?

There are a lot of questions on 'port forwarding' but there doesn't seem to be one that clearly states what it is and what it's used for. So: What is Port Forwarding? What is it used for, and why ...
74
votes
7answers
18k views

File extension for Markdown files?

Is there an official file extension for standalone Markdown files?
74
votes
2answers
103k views

Easy way to find out which process is locking a file or folder in Windows? [duplicate]

Possible Duplicate: How do I delete a ‘locked’ file? How can I find out which process is locking a file or folder in Windows? For instance if you are trying to delete a folder ...
73
votes
22answers
5k views

How can I explain why DRM cannot work?

I am looking for the shortest comprehensive way to explain to people that are trying to use DRM as a technology to prevent users from using their data in some fashion deemed undesirable, why their ...
73
votes
16answers
14k views

Paranoid Parent: “WiFi safe for baby?” [closed]

I am most likely being an overprotective parent but since the birth of our newborn, my wife and I have been wondering about credible studies dealing with Wi-Fi and health concerns. I love my Wi-Fi, ...
73
votes
10answers
11k views

Are computers with more RAM potentially faster if not all memory is usually in use?

Let's say I have a computer with 16 GB of memory. If my computer is usually only using about 4 GB and never reaches 8 GB, is it any faster than a computer with only 8 GB of (the same type of) memory? ...
73
votes
5answers
121k views

How to uninstall homebrew? (OSX Package Manager)

I've got some problems with this package manager. I can't find how to remove it! Is it safe to remove whole /usr/local? Homebrew was installed somewhere in that directory.
73
votes
12answers
46k views

Mass deleting files in Windows

I have a directory, that contains ~ 3 million files in certain subdirectories on a Windows 2008 server. Manually deleting the files via SHIFT+DEL on the root dir takes ages. Is there any other way to ...

15 30 50 per page