Commands by nickleus (9)

  • convert all flac files in a folder to mp3 files with a bitrate of 192 kbps


    5
    for f in *;do flac -cd $f |lame -b 192 - $f.mp3;done
    nickleus · 2010-10-19 07:55:11 4
  • split large video file

    i have a large video file, 500+ MB, so i cant upload it to flickr, so to reduce the size i split it into 2 files. the command shows the splitting for the first file, from 0-4 minutes. ss is start time and t is duration (how long you want the output file to be). credit goes to philc: http://ubuntuforums.org/showthread.php?t=480343 NOTE: when i made the second half of the video, i got a *lot* of lines like this: frame= 0 fps= 0 q=0.0 size= 0kB time=10000000000.00 bitrate= 0.0kbit just be patient, it is working =) Show Sample Output


    2
    ffmpeg -i 100_0029.MOV -ss 00:00:00 -t 00:04:00 100_0029_1.MOV
    nickleus · 2010-08-08 23:43:28 5
  • convert flac to mp3

    if you haven't already done so, install lame and flac: sudo apt-get install lame flac Show Sample Output


    2
    flac -cd input.flac |lame -h - output.mp3
    nickleus · 2010-03-05 23:54:21 6
  • set your ssd disk as a non-rotating medium

    if you still get a permissions error using sudo, then nano the file: sudo nano -w /sys/block/sdb/queue/rotational and change 1 to 0 this thread: http://www.ocztechnologyforum.com/forum/showpost.php?p=369836&postcount=15 says that this will "help the block layer to optimize a few decisions"


    5
    sudo echo 0 > /sys/block/sdb/queue/rotational
    nickleus · 2009-11-27 12:16:17 11
  • find read write traffic on disk since startup

    The iostat command is used for monitoring system input/output device loading by observing the time the devices are active in relation to their average transfer rates. in ubuntu to get the iostat program do this: sudo apt-get install sysstat i found this command here: http://www.ocztechnologyforum.com/forum/showthread.php?t=54379 Show Sample Output


    3
    iostat -m -d /dev/sda1
    nickleus · 2009-11-27 12:00:48 6
  • convert mp3 to ogg

    why would you want to convert mp3's to ogg? 1 reason is because ardour doesn't support mp3 files because of legal issues. this is really the only reason you would do this, unless you have really bad hearing and also want smaller file sizes, because converting from one lossy format to another isn't a good idea. Show Sample Output


    -1
    mp32ogg file.mp3
    nickleus · 2009-11-16 20:22:48 6
  • convert wav files to ogg

    cd to the folder containing the wav files and convert them all to ogg format. in my sample output i use the -a and -l flags to set the author and album title. to get the oggenc program in ubuntu linux run: sudo apt-get install oggenc Show Sample Output


    2
    oggenc *.wav
    nickleus · 2009-11-11 14:26:01 8
  • convert wav files to flac

    cd to the folder containing the wav files, then convert them all to flac. yeah baby! in ubuntu, to get the flac program just: sudo apt-get install flac flac file input formats are wav, aiff, raw, flac, oga and ogg Show Sample Output


    3
    flac --best *.wav
    nickleus · 2009-11-11 14:17:24 14
  • search ubuntu packages to find which package contains the executable program programname

    search ubuntu's remote package source repositories for a specific program to see which package contains it Show Sample Output


    7
    apt-file find bin/programname
    nickleus · 2009-11-10 10:21:45 9

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IBM AIX: Extract a .tar.gz archive in one shot
This command is for UNIX OSes that have plain vanilla System V UNIX commands instead of their more functional GNU counterparts, such as IBM AIX.

get xclip to own the clipboard contents
"Copying" things to the X clipboard doesn't normally create a copy. Rather the data to be 'copied' is referenced. This means that if the application that you 'copied' stuff from is closed, that data is lost. If the application that you 'copied' from is suspended with CTRL-Z, there could be some issues if you try to paste it into something. This command will create a copy of referenced data and have xclip be the provider of it, so you can then go ahead and close the app that contains the original information. Caveat: I'm not sure if this is binary-safe (though i would expect it to be), and don't know what would happen if you used it to clip a 20 meg gimp image. This technique becomes more convenient if you set it up as an action in a clipboard manager (eg klipper, parcellite). Some of these applets can take automatic action based on a variety of parameters, so you could probably just get it to always own the clipped data whenever data is clipped.

Sort movies by length, longest first
Sort .avi movies by time length, print the longest first, and so on...

change user & preserver environment (.bashrc&co)

download specific files only from a website

Beep siren
Infinitely plays beeps with sinusoidally changing sound frequency. Ideal for alarm on an event.

Recursive grep of all c++ source under the current directory
I like this better than some of the alternatives using -exec, because if I want to change the string, it's right there at the end of the command line. That means less editing effort and more time to drink coffee.

The Hidden PS
While going through the source code for the well known ps command, I read about some interesting things.. Namely, that there are a bunch of different fields that ps can try and enumerate for you. These are fields I was not able to find in the man pages, documentation, only in the source. Here is a longer function that goes through each of the formats recognized by the ps on your machine, executes it, and then prompts you whether you would like to add it or not. Adding it simply adds it to an array that is then printed when you ctrl-c or at the end of the function run. This lets you save your favorite ones and then see the command to put in your .bash_profile like mine at : http://www.askapache.com/linux-unix/bash_profile-functions-advanced-shell.html Note that I had to do the exec method below in order to pause with read. t () { local r l a P f=/tmp/ps c='command ps wwo pid:6,user:8,vsize:8,comm:20' IFS=' '; trap 'exec 66

Easily decode unix-time (funtion)

Search some text from all files inside a directory

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