Handy Linux Commands |
Images
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 *
Audio
Fix Canon WAV files:
$ ffmpeg -acodec copy -i file.wav file2.wav
Video
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
Filesystem
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}
Web
Download a website for offline reading:
$ wget -E -p -r -l inf -np -k http://www.example.com
Programming
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
Bash
While loop:
#!/bin/sh
i=0
while [ x -lt 5 ]
do
# do something
i=`expr $i + 1`
done
Handy Linux Commands
About Roger Keays
 |
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. |
