Supermind Search Consulting Blog 
Solr - Elasticsearch - Big Data

Delete files older than 7 days:

cd /path/to/dir
find -mtime +7 -exec rm {} \;

Change +7 to +14 for deleting files older than 14 days.

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Ever had your Intel wireless card play up on you in Ubuntu? You can't seem to reset it like the ethernet cards (i.e. with ifup and ifdown). Do this instead:

sudo rmmod iwlagn && sudo modprobe iwlagn

Replace iwlagn with your wireless card module name if you don't have an intel wireless card.

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Anyone on Ubuntu will probably have used gedit at one time or the other.

Well, gedit just got cooler.

Turns out you can map/remap shortcuts on all gnome-based applications including gedit by changing a simple setting.

1. Hit Alt-F2, enter gconf-editor
2. Go to desktop > gnome > interface
3. check can_change_accels

Now in gconf-editor, click the Edit menu, you should see a menu entry called "List Recent Keys". Move your mouse over the entry, then press any keyboard combination, say Ctrl-L. You should now see Ctrl-L on the right of "List Recent Keys".

Ha! You've now mapped Ctrl-L to the "List Recent Keys" menu item.

And you can do this for all apps which are gnome-compliant, including gedit of course…

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clive is an awesome tool for downloading google video and youtube flash videos from the command-line.

sudo apt-get install clive
 
# download google video in flv
clive http://video.google.com/videoplay?docid=-1388254997387483895
 
# download youtube in mp4
clive --format=mp4 http://www.youtube.com/watch?v=JPyuH4qXLZ0
 
# download list of URLs in file
cat urls.txt | clive

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For example, to move all mp3 files in sub directories into the current dir:

find . -name *.mp3 -exec mv {} . \;

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Sometimes you want to get to all MP3 or PDF files which are nested in a deep directory tree. Here's what you do..

rsync -rvtW --delay-updates --modify-window=1 --progress --include='*.pdf' --include='*.xml' --exclude='*.*' source dest

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Shameless ripped from http://www.catswhocode.com/blog/19-ffmpeg-commands-for-all-needs

Getting infos from a video file

ffmpeg -i video.avi

Turn X images to a video sequence

ffmpeg -f image2 -i image%d.jpg video.mpg
This command will transform all the images from the current directory (named image1.jpg, image2.jpg, etc…) to a video file named video.mpg.

Turn a video to X images

ffmpeg -i video.mpg image%d.jpg
This command will generate the files named image1.jpg, image2.jpg, …

The following image formats are also availables : PGM, PPM, PAM, PGMYUV, JPEG, GIF, PNG, TIFF, SGI.

Encode a video sequence for the iPpod/iPhone

ffmpeg -i source_video.avi input -acodec aac -ab 128kb -vcodec mpeg4 -b 1200kb -mbd 2 -flags +4mv+trell -aic 2 -cmp 2 -subcmp 2 -s 320×180 -title X final_video.mp4
Explanations :

Source : source_video.avi
Audio codec : aac
Audio bitrate : 128kb/s
Video codec : mpeg4
Video bitrate : 1200kb/s
Video size : 320px par 180px
Generated video : final_video.mp4

Encode video for the PSP

ffmpeg -i source_video.avi -b 300 -s 320×240 -vcodec xvid -ab 32 -ar 24000 -acodec aac final_video.mp4
Explanations :

Source : source_video.avi
Audio codec : aac
Audio bitrate : 32kb/s
Video codec : xvid
Video bitrate : 1200kb/s
Video size : 320px par 180px
Generated video : final_video.mp4

Extracting sound from a video, and save it as Mp3

ffmpeg -i source_video.avi -vn -ar 44100 -ac 2 -ab 192 -f mp3 sound.mp3
Explanations :

Source video : source_video.avi
Audio bitrate : 192kb/s
output format : mp3
Generated sound : sound.mp3

Convert a wav file to Mp3

ffmpeg -i son_origine.avi -vn -ar 44100 -ac 2 -ab 192 -f mp3 son_final.mp3

Convert .avi video to .mpg

ffmpeg -i video_origine.avi video_finale.mpg

Convert .mpg to .avi

ffmpeg -i video_origine.mpg video_finale.avi

Convert .avi to animated gif(uncompressed)

ffmpeg -i video_origine.avi gif_anime.gif

Mix a video with a sound file

ffmpeg -i son.wav -i video_origine.avi video_finale.mpg

Convert .avi to .flv

ffmpeg -i video_origine.avi -ab 56 -ar 44100 -b 200 -r 15 -s 320×240 -f flv video_finale.flv

Convert .avi to dv

ffmpeg -i video_origine.avi -s pal -r pal -aspect 4:3 -ar 48000 -ac 2 video_finale.dv
Or:
ffmpeg -i video_origine.avi -target pal-dv video_finale.dv

Convert .avi to mpeg for dvd players

ffmpeg -i source_video.avi -target pal-dvd -ps 2000000000 -aspect 16:9 finale_video.mpeg
Explanations :

target pal-dvd : Output format
ps 2000000000 maximum size for the output file, in bits (here, 2 Gb)
aspect 16:9 : Widescreen

Compress .avi to divx

ffmpeg -i video_origine.avi -s 320×240 -vcodec msmpeg4v2 video_finale.avi

Compress Ogg Theora to Mpeg dvd

ffmpeg -i film_sortie_cinelerra.ogm -s 720×576 -vcodec mpeg2video -acodec mp3 film_terminée.mpg

Compress .avi to SVCD mpeg2

NTSC format:

ffmpeg -i video_origine.avi -target ntsc-svcd video_finale.mpg
PAL format:

ffmpeg -i video_origine.avi -target pal-svcd video_finale.mpg

Compress .avi to VCD mpeg2

NTSC format:
ffmpeg -i video_origine.avi -target ntsc-vcd video_finale.mpg

PAL format:
ffmpeg -i video_origine.avi -target pal-vcd video_finale.mpg

Multi-pass encoding with ffmpeg

ffmpeg -i fichierentree -pass 2 -passlogfile ffmpeg2pass fichiersortie-2

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For Ubuntu..

sudo apt-get install ffmpeg
 
cd ~/bin
wget https://github.com/rg3/youtube-dl/raw/2010.11.19/youtube-dl
chmod +x youtube-dl
 
wget http://www.supermind.org/scripts/youtube2mp3
chmod +x youtube2mp3

The contents of youtube2mp3 is simple:

#!/bin/bash
#!/bin/bash
 
x=/tmp/.youtube-dl-$RANDOM-$RANDOM.flv
youtube-dl --output=$x --format=18 "$1"
ffmpeg -i $x -vn -ar 44100 -ac 2 -ab 256k -f mp3 "$2"

Now get the youtube URL you want to convert to MP3, and run it like so:

youtube2mp3 <youtube_url>

For example:

youtube2mp3 http://www.youtube.com/watch?v=cFhaBEtmHeU

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Ever thought typing cd.. 5 times was silly? Try this up() function!

Add this to .bash_profile or .bashrc

up () {
    if [ -z $1 ]; then
        cd ..
    elif [ $1 -gt 0 ]; then
        let count=0
        while [ $count -lt $1 ]; do
            cd ..
            let count=count+1
        done
    else
        echo "Argument must be a positive integer."
    fi
    pwd
}

The script in action:

kelvin:~/java/search/apache-solr-1.4.0/src/java/org/apache/solr/search$ up 5
kelvin:~/java/search/apache-solr-1.4.0/src$

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#!/bin/bash
find ./ -name ".svn" | xargs rm -Rf

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