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24,993 verified issues
dhclient and dhcpcd the real difference
I can't figure out the difference from just the man pages. I can see what is a daemon and one is a client, but what does that mean practically when using the commands? Also what is the difference between the client and daemon in this case, not just the terms (client and daemon) but functionally wis…
How to scroll backwards when displaying file using "more" command?
Return scrolls forward. How do I scroll backward one line at a time?
Save vim settings across launches?
My professor assigned an ssh account to every student in my programming class and mandated that we use VIM for text editing. I discovered and via Google. I noticed that those two settings reset after every launch. Is there a way to make them persist on my ssh account? What about on VIM on my local …
How many characters can an IP address be?
I have to create a field in a mysql table to store ip addresses. I need to know the maximum characters an ip address can possibly be. Whether ipv4, ipv6 or some other type that can render a valid ip address unusually long. So what should I set the character limit to? I am asking for length in the s…
What are some nice command line ways to inspect DLL/EXE details?
With most Windows executables (DLL, EXE...), version and other details can be viewed using "Details" tab in "Properties" (Alt+Enter). I wonder: is there also a command-line way to do this? I'm particularly interested for Product version, but also other things could be useful. Following properties a…
Stop programs from stealing focus in Windows 7
In Windows 7, if I launch a program and immediately make its window inactive (e.g. by minimizing or switching windows), it will pop back up after the program has finished loading completely. This is undesirable. I would like to let a program load in the background without having it steal focus once…
Should uploading a file on DSL kill the download speed?
I have the 20,127/893 Kbps service through CenturyLink DSL. I've ran speed test and it typically reports speeds close to that. Except whenever I upload something substantial. Like a video file to YouTube. The upload takes forever, which I understand because of the 893 Kbps upload speed, but the ent…
Why a non-root user can delete files created by root?
Given a non-root user "joshua", as root I created a file called "foo" at joshua's home directory (/home/johsua/); it look like this: and then delete it as joshua, i can delete it successfully. I would expect that joshua doesn't have enough permission to delete it. Is it some kind of 'Permissions in…
Legacy Kernel Caller preventing sleep mode
I have a problem with Windows 7 not sleeping. says a "Legacy Kernel Caller" driver prevents the sleep mode. This is not very helpful or informative. How do I get more details about that object? EDIT: I found that is the best way of dealing with such misbehaving drivers and software. The option -req…
How to test router-to-PC connection speed?
Is there a way to benchmark how fast my router is connected to my PC, independent of the internet? I've had slower-than-usual internet-based benchmarks, and I'm having a hard time figuring out if it's because of a bad router-to-PC connection (interference, bad signal, etc.) or if it's indeed becaus…
What do the numbers 240 and 360 mean when downloading video? How can I tell which video is more compressed?
I have downloaded some computer science lectures from YouTube recently. There is usually more than one choice of file size and file format to download. I noticed that for the same video, the downloadable one with FLV 240 extension is larger than another one with MPEG4 360 extension. What does the n…
how to delete all characters after cursor in shell
I want to delete all characters after cursor in putty or shell. How can i achieve this? Every time I want to delete the complete line, I need to press delete key and that is something I don't want to do. Finding a way to delete the line improve my speed and effieciency. e.g @ is my cursor position …
If I have two internet connections on osx, how can I use both to increase my bandwidth?
I understand that any one connection (such as a non-p2p download) will use just one of the connections, but since most normal activity involves multiple connections at once, I can still in theory increase my overall bandwidth by sending some traffic over each connection. See also the following simi…
zsh right-justify in ps1
I'd like a multi-line zsh prompt with a right alined part, that will look something like this: I know about RPROMPT in zsh, but that has a right-aligned prompt opposite your normal prompt, which is on the same line of text as your typing. Is there a way to have a right-aligned portion to the first …
Which have better performance Two 2GB RAM sticks or One 4GB RAM stick?
I am planning to buy a new PC. The mainboard has 4 memory slots, The PC has Windows 7 64-bit installed. Which approach is better regarding the performance buying: Two memory sticks of 2GB? One memory stick of 4GB? I am also interested in dual channel memory architecture.
What is the unix command to find out what executable file corresponds to a given command?
For example, if passed as input it should tell me that will run if run on the command-line.
How to remove permanent map of a network drive on OS X Lion?
Some time ago I mapped a network drive on my Snow Leopard Mac, which was upgraded to Lion. The network drive is not active any more and I receive popups all the time with the error: There was a problem connecting to the server XXXX. I have no idea how I configured at the time. I may have included a…
Why is "It works!" showing up at my http://127.0.0.1 (localhost)?
So, I was playing around with Java sockets, servers and streams, the other day, and I decided, purely out of curiosity, expecting no good results, to open Google Chrome and navigate to 127.0.0.1, and lo and behold, I come across an actual page! The page source is I got hit with an epiphany that I c…
Disable "Confirm Form Resubmission" prompt on Google Chrome
I would like to disable "Confirm Form Resubmission" popups on Google Chrome when I make a refresh. This (very) old discussion acknowledges the problem but doesn't provide a fix. Is there someone out there with a better idea?
How to use ffmpeg to add metadata to an AAC file without reencoding?
I'm using ffmpeg to extract just the audio stream from a video file: This produces a clean audio file but without any metadata. To add metadata, ffmpeg has a command line option: This runs without error, but when the output file is checked with ffprobe, it has no metadata tags at all. If the output…