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 0
  • 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 0
  • 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 1
  • 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 3
  • 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 0
  • 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 0
  • 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 1
  • 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 2
  • 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 2

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Compare two directory trees.

Search big files with long lines
This is a handy way to circumvent the "Maximum line length of 2048 exceeded" grep error. Once you have run the above command (or put it in your .bashrc), files can be searched using: $ lgrep search-string /file/to/search

Using numsum to sum a column of numbers.
numsum is part of of the num-utils package, which is available in some Linux distros and can also be downloaded at http://suso.suso.org/xulu/Num-utils. It contains about 10 different programs for dealing with numbers from the command line. Obviously you can do a lot of things that the num-utils programs do in awk, sed, bash, perl scripts, but num-utils are there so that you don't have to remember the syntax for more complex operations and can just think: compute the sum, average, boundary numbers, etc.

cleanup /tmp directory
Cleans all files in /tmp that have been accessed at least 2 days ago.

Convert CSV to JSON
Replace 'csv_file.csv' with your filename.

Get all IPs via ifconfig
works on Linux and Solaris. I think it will work on nearly all *nix-es

Get AWS temporary credentials ready to export based on a MFA virtual appliance
You might want to secure your AWS operations requiring to use a MFA token. But then to use API or tools, you need to pass credentials generated with a MFA token. This commands asks you for the MFA code and retrieves these credentials using AWS Cli. To print the exports, you can use: `awk '{ print "export AWS_ACCESS_KEY_ID=\"" $1 "\"\n" "export AWS_SECRET_ACCESS_KEY=\"" $2 "\"\n" "export AWS_SESSION_TOKEN=\"" $3 "\"" }'` You must adapt the command line to include: * $MFA_IDis ARN of the virtual MFA or serial number of the physical one * TTL for the credentials

Shows how many percents of all avaliable packages are installed in your gentoo system

Get Lorum Ipsum random text from lorumipsum.com
This will generate 3 paragraphs with random text. Change the 3 to any number.

Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

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