OT: setting variables

[Bryan]

okay, here goes...

I am making a script that will help me automate conversion of movies
to other formats.  I'm trying to set a variable $CROP and I'm trying
to pull info from a text file created by mplayer to get the black
lines off of the movie.  Here is the script:


----------------------------------------------------------------------------------------------
#!/bin/sh

mplayer -v -ss 00:15:00 -frames 20 -vf cropdetect dvd://1 > crop.txt

export CROP=`tail -n 11 crop.txt | grep CROP | cut -d= -f2 | cut -c 1-11`

echo $CROP
----------------------------------------------------------------------------------------------

now, the text file creates text, and I've used the "tail - grep - cut
- cut" command on the command line and was able to get the data I
needed.  Also on the command line, I can export the variable (I do it
all the time with PKG_PATH).  When I run the script, the crop.txt is
created, and the variable prints out $CROP, but after the script ends,
I attempt to "echo $CROP" and the variable is empty...

Is there something I'm missing?  Or is there nothing wrong, and the
script (while running) knows the value of $CROP, value of $CROP is
dropped once the script terminates.


Regards,
Bryan