Since linux 2.6.30 filesystems are mounted with "relatime" by default. In this discussion, Ingo molnar says he has added the CONFIG_DEFAULT_RELATIME kernel option, which, i quote: "makes "norelatime" the default for all mounts without an extra kernel boot option." I don't really get it, i wonder...

Here are my 2 Linux audio MP3 puzzles: how to trim the beginning off an MP3 audio? (I can't get ffmpeg -ss to work) how to add mp3 tags readable by (of all things) Android? (mp3info doesn't seem to set the fields in a way readable by Android music players) So far, to do what I want, I am in t...

I need to mount a directory in a way that prevents user accessing it. However I need to have access to all attributes (including permission) from root. Is following method safe or is there a way around it: mkdir /mnt/protect chmod 700 /mnt/protect mkdir /mnt/protect/some_dir mount /dev/sdXn /mnt...

As part of doing some cold cache timings, I'm trying to free the OS cache. The kernel documentation at http://www.kernel.org/doc/Documentation/sysctl/vm.txt says drop_caches Writing to this will cause the kernel to drop clean caches, dentries and inodes from memory, causing that memory to becom...

I'm working with putty but got slow connection to the server. It's not slow everywhere and I don't need to get it faster. Just a keyboard typing trouble. Because I want to see what I type without delay. So the correct question : How to work with putty without delay in typing.

Assume that a directory has 100 files starting with the letter 'a'. If I do a grep <some string> a* from the terminal, how will the shell handle this? Will it expand the regular expression, get a list of all files starting with a and grep on each one of those sequentially? Or is there som...

I created a two backup scripts - one for files (filebackup.sh) and another for database (dbbackup.sh). filebackup.sh calls dbbackup.sh and stores the output in a variable. The output returned by dbbackup.sh is the tar filename in which the script has stored all the backed up databases. The scrip...

can any one tell me with suitable example and meaningful info the technical difference between grep vs egrep vs fgrep ? and when i need to use grep over egrep and vice versa? hoping for quick and positive response.

Searching, googling, I could not find any information about file types recognized by file. For example, an *.mp4 file is identified as "ISO Media" (while being able to play with VLC normally). This is not 100% clear, it somehow leaves me to wonder whether it's a correct detection or the file i...

Suppose, I run the following commands; export STR="abcdef.ghijkl.mnopqr.stuvwy.log" echo $STR | sed 's/\.[^.]*$//' I am getting the following result; abcdef.ghijkl.mnopqr.stuvwy Please help me understand the above result. Thanks, Varun

My .bashrc has the following: # Alt+L lists current directory bind -x "\"\el\":ls -ltrF --color=auto;" # trap commands and echo them to xterm titlebar. trap 'echo -ne "\033]0;$BASH_COMMAND - $USER@${HOSTNAME}>$(pwd)\007"' DEBUG Demo of the problem: bash-4.2$ [Alt+L] #works total 0 -rw-rw-...

I have MySQL Ver 14.12 Distrib 5.0.45 server running on Multiflex Intel Blade having 8G of RAM & 8 x Intel(R) Xeon(R) CPU E5410 @ 2.33GHz. The problem i have facing is :- 1) Since last 3-4 days my 2G swap space is getting full & the server goes into hangged state due to that i need to ...

Im looking to refactor the following command tail -f production.log | grep -e "Processing " -e "compatible;" -e "Completed in " -e This is the output of the command Processing BasketController#cross_sell_product (for 85.189.237.x at 2011-08-03 12:46:07) [POST] "RequestLog","2011-08-03 12...

I am having troubles setting up dualhead with an NVidia Quadro FX3450/4000 card with Centos 6.2. The driver is installed from ELRepo. I set up twinview with nvidia-settings (and check /etc/X11/xorg.conf), and both monitors are recognized and properly set up (desktop spans both of them, for insta...

Is there a Linux distro compiled with clang/llvm? Looks like as of late 2010 the kernel was working. If not, would it be more likely to be a technical or licensing issue?

I have a computer that is only used some of the time, and I was was wondering if there was a way to have it turn itself off after a period of inactivity. Here's the tricky part, if I was just thinking about having it turn itself off when the GUI is idle then I think it would be significantly eas...

I can see that one of the FS is full, but how can I extend the FS? How can I find out what ""LVM like"" volume manager is being used on it? SunOS 5.10

In my .bash_profile file, I'd like to setup a single command alias that is two commands that execute one after another. The first command takes an argument from the command line and the second is actually script (located in ~/bin with exec perms). My profile file has this: alias pd='function p...

I was attempting to add the man pages for my texlive distribution today when I accidentally did this: >MANPATH=MANPATH:/usr/local/texlive/2011/texmf/doc/man >export MANPATH when I meant this: >MANPATH=$MANPATH:/usr/local/texlive/2011/texmf/doc/man >export MANPATH The result is t...

Recently my computer had to be hard-reset, and fsck ran on /home filesystem, producing lots of errors (old HDD drive). After reset I don't see all my saved emails in KMail (KDE 3.5.3), at least those that were present in folder that was opened when computer crashed. The files are there physical...

The file contains: dateutkfilename25012009 I want to change the position of character 16th to 17th with 18th to 19th. And then change position of character 16th to 19th with 20th to 23rd... so it will be: dateutkfilename20090125 I've tried to change position of character 16th to 17th with 1...

Part of the Korn script I am writing requires that I replace all occurrences of the ' character with 2 occurrences (''). I am trying to log some sql that I am generating in this script to a column in another table but single quotes need to be replaced with 2 instances of the single quote charact...

I am not sure if I understand the concept of hardware and software interrupts. If I understand correctly, the purpose of a hardware interrupt is to get some attention of the CPU, part of implementing CPU multitasking. Then what issues a hardware interrupt? Is it the hardware driver process? I...

When I run: watch 'cmd >> output.txt' & the job gets suspended by the system: 3569 Stopped (tty output) Is there a workaround?

is it currently possible to setup LXC containers with X11 capabilities? I'm looking forward for the lightest available X11 container (memory-wise), hardware acceleration a plus but not essential. If it is not currently possible, or readily available, is it known what functionality needs to be ye...

I'm creating service manifests for MySQL and a WebLogic service that depends on the MySQL service. I want all of them to use the management model "wait" (run a process in the foreground). I have some questions about this setup. First, how do I dictate the status of a service? For example, when I...

Is there any way to use the mouse wheel to scroll through the output of a screen session? I can use the keypad scroll through previous output in screen after pressing ctrl+a [. Is it possible to do this with the mouse wheel? Aside: To make matters worse, I'm on Windows using Putty to ssh to a ...

With the current screen I'm using, I'm getting this really weird background issue. It appears that the background isn't setting the rest of the panel. What's weirder is that I've noticed that different themes behave differently with this. Is there a theme file I can edit which will fix this wei...

Please see this video to understand what I'm describing: Weirdness in Eclipse - YouTube. Essentially, when I use the "Ambiance Evolution" theme with Eclipse, it starts wiggling and doesn't stop, as weird as that sounds. I really like the theme, so I'd like to be able to use it, but this is kind o...

I have been struggling for months on how to add mp3 tags readable by (of all things) Android? (mp3info doesn't seem to set the fields in a way readable by Android music players, and neither does RhythmBox). So far, my most success has been the embarrassment of ripping the CD from a Windows machi...

I have a computer with a fakeraid 0 array (the computer came with it, and I don't want to remove my other OS to get rid of it), and I am trying to install Linux Mint. When I first boot up from the live usb, the partitions on the raid array do not show up in /dev/mapper/ and gparted does not see t...