Convert this Windows command to UNIX

[tehon3299]

Hey all,

I'm trying to convert this Windows command to work on my Linux box. Anyone help?

command:
for %i in (*.avi) do ffmpeg -i %i -f mjpeg -t 0.001 -ss 5 -y %~ni.tbn

Thanks!

 

[motoslide]

I have no idea what "ffmpeg" and "mjpeg" do, so the commands and options might not work, but to just convert your script to a UNIX equiv, it might be something like this:

for i in `ls *.avi`
do
ffmpeg -i $i -f mjpeg -t 0.001 -ss 5 -y $i.tbn
done




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[tehon3299]

Thanks man! Works like a charm if I put it in a file and run it. Can I run this from a prompt without having to put it in a file?

 

[coffeysm]

Yea if you enter each line individually. Why would you want to do that anyway? Just make it a script and add it to your path.

 

[tehon3299]

I want to do this because I have to do this to multiple directories. Could I make this script grab the current directory somehow? So I can 'cd' to the directory I want and then run the command?

 

[coffeysm]

You can run that command from any your directory your in.

 

[coffeysm]

as long as the location is in your PATH.

 

[p5wizard]

as long as the location is in your PATH.

meaning: as long as the script you made (make) is in a directory which is listed in the $PATH variable.

echo $HOME # home dir
echo $PATH # search path

if you see a directory which is your home_dir or something derived thereof /home/username/bin e.g. Put the script in there and you can run it from wherever you are.

HTH,

p5wizard

 

[motoslide]

Could I make this script grab the current directory somehow?

DIR=$1
if [ "$DIR" != "" ]
   then
   cd $DIR
fi
for i in `ls *.avi`
do
  ffmpeg -i $i -f mjpeg -t 0.001 -ss 5 -y $i.tbn
done

Now just run your script with the destination directory as the first argument. You can expand on this to preset a list of directories like so:

for j in `cat $HOME/dlist`
do
  cd $j
  for i in `ls *.avi`
  do
    ffmpeg -i $i -f mjpeg -t 0.001 -ss 5 -y $i.tbn
  done
done

Note that this is a pretty basic outline, and has no provisions to make sure $HOME/dlist exists, or that the directories contained in $HOME/dlist are valid. As written, the directory names listed in $HOME/dlist would need to be full pathnames.

"Proof that there is intelligent life in Oregon. Well, Life anyway.

 

[stefanwagner]

Instead of

for i in `ls *.avi`,

which is errorprone in case of blanks in filenames (they're kind of common sense in windows), I suggest:

for i in *.avi

Perhaps that's only true for bash, so test it out.

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