Handy Linux Commands

By , 31 July 2008

Handy Linux Commands


Resize images:

$ mogrify -resize 50% *

Replace/attach image colour profile:

$ mogrify -profile ~/etc/argb.icc *

Lossless jpeg rotation based on EXIF data:

$ exifautotran *

Set the modification date of a photo based on EXIF data:

$ jhead -ft *


Fix Canon WAV files:

$ ffmpeg -acodec copy -i file.wav file2.wav


Capture from video in (ffmpeg):

$ ffmpeg -ac 2 -ar 48000 -f oss -i /dev/dsp -s 720x576 -r 25 -f video4linux2 -i /dev/video0 -y -ac 1 -ab 192k -qscale 4 out.avi

Capture from video in (mencode):

$ mencoder tv:// -tv driver=v4l2:width=720:height=576:normid=4:input=0:fps=25:forceaudio:adevice=/dev/dsp:audiorate=48000 -oac mp3lame -lameopts br=224:mode=3 -ovc lavc -lavcopts vcodec=mpeg4:vqscale=4 -endpos 1:05:00 -o out.avi

Convert mjpeg to mpeg4:

$ ffmpeg -i file.avi -r 27 -qscale 6 -ab 128K -vcodec mpeg4 file.b.avi

Convert directory of mjpegs to mpeg2 and retain creation dates:

$ for i in *.avi; do ffmpeg -i $i -r 27 -ab 128K -sameq -vcodec mpeg2video ${i:0:${#i}-4}.mpg; touch -r $i ${i:0:${#i}-4}.mpg; done;

Convert ogg vorbis to flash video (requires mp3 support):

$ ffmpeg -i file.ogv -sameq file.flv


Loop over a list of files which contain spaces:

$ ls -1 | while read x; do echo $x; done

Convert absolute symlinks to relative ones (must be run twice):

$ symlinks -c -s .
$ symlinks -c -s .

Sync home dir with external hard drive:

$ rsync --delete --exclude ".*" --exclude Bureau --exclude tmp \
        -av /home/roger/ /media/disk

Convert DOS text file to UNIX:

$ apt-get install tofrodos
$ dos2unix {file}


Download a website for offline reading:

$ wget -E -p -r -l inf -np -k http://www.example.com


Edit a log message:

$ svn propedit svn:log svn+ssh://svn.ninthavenue.com.au/blah -r11 --revprop

Import an upstream release (e.g. fckeditor):

~/fckeditor $ svn import svn+ssh://svn.ninthavenue.com.au/apps/fckeditor/tags/2.6.0

Merge custom changes into new upstream release:

~ $ svn co svn+ssh://svn.ninthavenue.com.au/apps/fckeditor/branches/2.6.0-webcore fckeditor
~ $ cd fckeditor
~/fckeditor $ svn merge svn+ssh://svn.ninthavenue.com.au/apps/fckeditor/tags/2.5.1 svn+ssh://svn.ninthavenue.com.au/apps/fckeditor/branches/2.5.1-ninthavenue

Install / add a jar file into maven:

mvn install:install-file -Dfile=jboss-el-2.0.1.jar -DartifactId=jboss-el -DgroupId=org.jboss.el -Dverion=2.0.1 -Dpackaging=jar


While loop:

while [ x -lt 5 ]
        # do something
        i=`expr $i + 1`


Handy Linux Commands

About Roger Keays

Handy Linux Commands

Roger Keays is an artist, an engineer, and a student of life. He has no fixed address and has left footprints on 40-something different countries around the world. Roger is addicted to surfing. His other interests are music, psychology, languages, the proper use of semicolons, and finding good food.

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