Tuxmark

Linux Filesystem Description

2011-07-28T09:53:00.000-05:00

Have you ever wondered what the purpose of the directory /opt is? Try typing 'man hier' at a linux command prompt.

Rip audio from flv file

2010-10-15T16:47:00.000-05:00

ffmpeg -i /path/to/file.flv -acodec mp3 -ac 2 -ab 128 -vn -y /path/to/file.mp3

Mount an iso file in linux

2010-09-30T09:16:00.001-05:00

mount -o loop /path/to/file.iso /mnt/iso-o loop: specifies mounting the iso as a loopback device/path/to/file.iso is the source file/mnt/iso is the mount point on the filesystem

Make iso in linux

2010-09-30T09:10:00.001-05:00

mkisofs -r -o /path/to/file.iso /path/to/directory/all the files in the /path/to/directory/ will be made into a cd iso image at /path/to/file.iso-r: preserves long filenames upto 31 characters-o: output iso image

fixing cgi newline character problem in vim

2010-06-10T10:23:00.002-05:00

I recently had problems with a python "hello world" cgi script. Turns out, I originally wrote the file in a windows system and when I copied the cgi directory to a linux system, I encountered newline issues.use cat -v /path/to/file.py to print the file to stdout exposing the newline characters.in vim use:set fileformat=unixor:set fileformat=dosto write the correct newline characters when saving a

utc date time

2009-11-18T15:53:00.000-06:00

to get the utc date and time of the current system enter "date -u" on the command line.

ascii character code

2009-11-18T15:39:00.003-06:00

found this little tidbit to help out a friend.to find the ascii representation of a character in vim, place the cursor over the character and enter ":ascii".for more info on this vim feature, enter ":help ascii" in vim.to accomplish the same thing from the command line, "echo" the character and pipe to "od" (read the man page).

Burn cd iso to disk

2009-09-22T13:08:00.002-05:00

reference: Burning ISO images### update 2010-10-01 ###find cd burning device>wodim --devicesburn iso to device>cdrecord -v -eject speed=4 dev=/dev/scd0 /path/to/file.iso###################find cd burning device>cdrecord -scanbusthen>cdrecord -scanbus dev=ATAburn iso to device>cdrecord -v -eject speed=4 dev=ATA:0,2,0 /path/to/file.iso

Vim RegEx Search and Replace

2009-08-27T11:28:00.003-05:00

I have the following text:obj.getHost()obj.getYourHost()obj.setHost()obj.setYourHost()I want to change getHost() and setHost() to getMyHost() and setMyHost(). However, I do NOT want to change getYourHost() nor setYourHost().Following is the regex I constructed to make the change::1,4s/\.[sg]et\(Your\)\@!/&My/g\.[sg]et is the part of the expression that matches either .get or .set\(Your\)\@! is

mount windows network share on linux using cifs

2009-07-16T13:26:00.002-05:00

below is the command i used to mount a windows network share on a centos linux system. this is work on any linux distro> mount -t cifs //nas/share /mnt/point -o user=username,uid=some_user,gid=some_group,rw

vimrc customizations

2009-07-01T10:53:00.001-05:00

below are the vim customizations I place in my vimrc fileset foldmethod=markerset nobackupset nowritebackupset background=darkset number

Build Python 2.6 on CentOS 5.3

2009-07-01T10:28:00.002-05:00

Build Python 2.6 on CentOS 5.3download python 2.6.2 tarballextract python 2.6.2 tarball to /usr/src E.g., tar -xvjf /share/download/Python-2.6.2.tar.bz2 -C /usr/src> cd /usr/src/Python-2.6.2> ./configure> makemake a symbolic link in /usr/bin for the python 2.6.2 interpreter> ln -s /usr/src/Python-2.6.2/python /usr/bin/python26verify that the correct python interpreter is executed> python26verify

iceweasel not finding jre

2008-11-12T17:37:00.004-06:00

i'm currently running debian etch. iceweasel is not finding the sun java jre that i installed using apt. i found the solution at http://xjqian.wordpress.com/2007/11/11/jre-plugin-for-mozilla/ .after running aptitude install sun-java6-jremake a symbolic link ln -s /usr/lib/jvm/java-6-sun/jre/plugin/i386/ns7/libjavaplugin_oji.so ~/.mozilla/plugins/libjavaplugin_oji.sorestart

Faster USB Transfers

2008-08-07T10:24:00.009-05:00

Problem: Transferring files to my usb harddrive was taking a very long time.Solutions: Multi-step. Explained below.Links:http://www.linuxjournal.com/article/8093http://www.linuxquestions.org/questions/linux-general-1/slow-pendrive-usb-2.0-uploads-259591/After reading at the above links, I discovered a few things were causing my problem. First, in /etc/fstab I was mounting my usb drive with the

Useful IPs

2008-07-23T16:09:00.002-05:00

## mail servers74.125.67.18 mail.google.com69.147.112.160 mail.yahoo.com69.147.112.160 login.yahoo.com216.10.106.149 giles.net## misc208.65.153.251 youtube.com80.237.234.20 goosh.org## apt ips128.31.0.36 security.debian.org194.8.57.6 www.backports.org35.9.37.225 ftp.us.debian.org192.25.206.10 debian.org128.101.240.212 ftp.debian.org

Remaster Knoppix Overview

2008-05-08T14:32:00.015-05:00

Remaster Knoppix OverviewFiles:Get the bash scriptshttp://pclug.info/meeting_0056/remasterKnoppixFiles.tar.gzCredits:Knoppix Remastering Howtohttp://www.knoppix.net/wiki/Knoppix_Remastering_HowtoPCLughttp://pclug.info/meeting_0051/slide_03.htmlGoals:Have a portable personalized remaster of Knoppixmultimedia apps that I like to usewindow manager other that KDEaccess to virtual machines using

usb devices in virtualbox on ubuntu 7.10

2008-02-29T14:43:00.002-06:00

the article at www.arsgeek.com/?p=2776 has all the necessary steps to follow for getting a windows xp vm to recognize usb devices on an ubuntu 7.10 system.

using screen as a terminal

2007-12-13T09:07:00.001-06:00

from duane's pclug 14 slides at http://duane.freeshell.net/pclug/meeting_0014/slide_04.htmlAll screen commands start with the keystroke CTRL-a. We'll learn the most important one first CTRL-a ? This shows us the keystroke reference for screen. Now we'll list the open windows with CTRL-a w. We see that we only have one window open. Let's fix that by creating a new window with CTRL-a c. Now

Using a torrent to download from the command line

2007-11-08T08:59:00.000-06:00

i was trying to download the dvd iso images of the debian distro. i downloaded the torrent files to the directory /data/iso/debian using the firefox browser. then i used btlaunchmany to actually download the iso images. i used the following commandbtlaunchmany /data/iso/debian --max_upload_rate 5 /data/iso/debian is the directory that contains the torrent files --max_upload_rate limits the

Burn content to a DVD

2007-11-08T06:53:00.000-06:00

use aptitude or apt-get to verify that you have dvd+rw-tools installed.use the following commandgrowisofs -dvd-compat -input-charset=ISO-8859-1 -Z /dev/hda -R -J -pad "/my/directory/datas" /dev/hda is the dvd burner device /my/directory/datas is the path to the content to be burned

How to format a DVD-RW

2007-11-08T06:51:00.002-06:00

use aptitude or apt-get to verify that you have dvd+rw-tools installed.use the following commanddvd+rw-format -force /dev/hda /dev/hda is the dvd burner device

Burn iso to a DVD from the Command Line

2007-11-08T06:47:00.000-06:00

use aptitude or apt-get to verify that you have dvd+rw-tools installed.use the following commandgrowisofs -dvd-compat -Z /dev/hda=/path/to/image.iso /dev/hda is the dvd burner device /path/to/image.iso is the iso file to burn

using sed to edit a string in a file

2007-10-04T12:59:00.001-05:00

action: use sed to change a windows path 'g:\\' to a unix path '/share/data' in a filecommand: sed -e 's/g:/\/share\/data/g' -e 's/\\\\/\//g' file.2comment: sed == is a stream editor that can be used from the command line format is - sed [command] <[inputfile]>[outputfile] -e == is followed by a command, in this case a regex < == is the input file > == is the output file

vi keybindings for xpdf

2007-10-04T10:55:00.000-05:00

Here is how to enable vi keybindings for xpdf navigation (j for up, k for down, h for left, l for right).Add the following line to your ~/.Xresouces file.xpdf.viKeys: trueThen run xrdb to load the changes:xrdb ~/.Xresoucessource: http://linuxwisdom.blogspot.com/search?q=xpdf

vga boot modes

2007-09-19T12:43:00.000-05:00

i found the following info when trying to change the screen resolution at the command line (http://www.pendrivelinux.com/2007/05/24/vga-boot-modes-to-set-screen-resolution/).VGA Resolution and Color Depth reference Chart: Depth 800×600 1024×768 1152×864 1280×1024 1600×1200 8 bit vga=771 vga=773 vga=353 vga=775 vga=796 16 bit vga=788 vga=791 vga=355 vga=794 vga=798 24 bit vga=789 vga=792

date format

2007-08-24T14:43:00.000-05:00

date +%F\@%H%Mwill display2007-08-24@1439

vim keystrokes

2007-08-24T14:40:00.000-05:00

1. Shift-k displays man page place the cursor on a unix command word and press Shift-k the man page for the command will be displayed

file diff using vim

2007-08-23T09:18:00.000-05:00

starting diff modevimdiff file1 file2 or vim -d file1 file2while already in vim you can start diff mode in three ways.:diffsplit {filename} - open a new window on the file {filename}:diffthis - make the current window part of the diff windows:diffpatch {patchfile} - use the current buffer, patch it with the diff found in {patchfile} and open a bufer on the resultjumping to diffs[c - jump

find and overwrite a file

2007-08-22T11:25:00.000-05:00

i had a need to find all files of a certain name, 'file1.file' and a certain size, greater than 20k, and overwrite every occurence with a different file 'file2.file'.find ./ -type f -iname 'file1.file' -size +20k -exec cp ~/trunk/file2.file '{}' \; ./ == start find from the current directory -type f == search for files -iname 'file1.file' == insensitive case of the file named file1.file -size

initial postgres login

2007-08-21T17:06:00.000-05:00

i recently installed postgres 8.1 on my debian system using aptitude. following are the steps i used to create a new database or user.1. su to super user2. su to postgres user3. create a new database or userfor more follow http://blog.revsys.com/2007/05/common_postgres.html

audio and usb on winxp vm in virtualbox

2007-08-07T15:48:00.000-05:00

below is what i did on my debian box to get audio and usb to work on my winxp vm in virtualbox. i would expect this to work just fine on ubuntu also.audioopen the innotek virtualbox programchoose the winxp vm and click the settings button for the vmselect audio in the left hand menuselect enable audioselect host audio driver to be ALSA audio driverusbexecute the following command from the command

steps to compile a debian kernel

2007-07-10T17:35:00.000-05:00

DebianKernelCompileStepsThese following steps to compile a Linux kernel for Debian are taken from steps published on the web by Falko Timme [at] falkotimme [dot] com. I modified his steps for grub. He originally used lilo.Be aware that there is some risk in compiling your own kernel! For example, it could happen that your machine does not boot properly after you have installed the new kernel so

faster debian booting

2007-07-10T17:16:00.000-05:00

to speed up my debian booting, i have disabled the following services using the update-rc.d command:postgresqlbittorrenttomcat5bluetoothapache2apache-perldoing this should speed up my systems boot time and still give me access to these services when i choose to use them.

managing system services/daemons

2007-07-10T16:55:00.000-05:00

on a debian system, the scripts to start and stop the system's services/daemons reside in /etc/init.d/ . For example, to stop the bittorrent service execute the following at the command line:>/etc/init.d/bittorrent stopto start the bittorrent service, execute the following at the command line:>/etc/init.d/bittorrent startwhat if the package apache2 is installed on my system, but i don't want that

synchronize files between laptop and usb disk

2007-06-29T16:16:00.000-05:00

following is the command i used to synchronize music files on my laptop and external usb disk. /share/music/files/ is the path on my laptop.rsync -avzC /share/music/files/ /media/usbdisk/music/files -a == archive -v == verbose -z == use compression while transferring files -C == exclude common CVS files and directories trailing / on a path means to only copy the contents of that

restart services after update

2007-06-29T16:12:00.000-05:00

how do i know which services need to be restarted after a system update? in the package debian-goodies is a program named checkrestart. run this program as root and it will print out the daemons that need to be restarted.

allow a user to mount a usb drive

2007-06-29T06:37:00.000-05:00

i wanted to use rsync ( a cool synchronization program) to keep the music files on my laptop and external usb disk in sync. the problem i ran into was that root was the only user that can mount and umount a drive. after mounting root would own all the files on the usb drive and i could not rsync my files without doing a chown recursively on the usbdisk or letting root own all of the music files

keyboard shortcut to launch web browser

2007-06-27T13:55:00.000-05:00

i want to use a keyboard shortcut to launch my web browser. i'm currently using Gnome on a Debian system. on the top panel choose Desktop -> Preferences -> Keyboard Shortcuts. in the keyboard shortcuts window, select Launch Web Browser and enter the desired key combination. i chose ctrl-alt-w as my key combo.when i used my key combo the first time it launch a gnome web browser. i would prefer to

synchronize usb drive with laptop in linux

2007-06-27T12:53:00.000-05:00

below is the command i used to synchronize the contents of my usb thumbdrive with a shared directory on my computer>rsync -Cavz --delete /media/usbdrive/ /share/syncDir/ -C == excludes cvs directories -a == archive, preserves pretty much everything recursively -v == verbose -z == compresses data, only necessary when dealing with a remote connection --delete == deletes

how i fixed my no sound problem in Debian

2007-06-27T10:36:00.000-05:00

i recently install Debian my laptop. i had trouble getting xmms to play sound. after much googling i had to install the appropriate alsa packages, execute alsaconf, and add my user to the audio group (adduser username audio). this seemed to do the trick.

Find a directory by name in linux

2007-06-22T13:48:00.000-05:00

Command to find a directory by name in linux>find /share/backup/ -type d -name '.svn' -ls -type d == directory -name '.svn' == all directories named .svn -ls == converts unusual characters to C style escape sequencesTo delete the list of directories returned by the above command execute>find /share/backup/ -type d -name '.svn' | xargs /bin/rm -dr xargs builds and executes command