08-02-2008
help removing characters for output file in shell script
hi i'm new to shell scripts and have a small problem
i am running a batch converter that returns all flash .flv files in a directory and create a png image from each one
Quote:
#!/bin/bash
echo "flv-to-png converter"
echo ""
if (($# ==0))
then
echo "Usage: flvtopng [flv files] ..."
exit
fi
while (($# !=0 ))
do
ffmpeg -i $1 -vcodec png -vframes 1 -an -ss 00:00:08 -t 00:00:01 -f rawvideo -s 320x240 /var/www/vhosts/mysite.com/httpdocs/playerimage/$1.png
shift
done
echo "Finished with flv-to-png converter"
echo ""
the problem i have is the $1 variable , its ok on the first call but on the secound call $1.png , i have extra characrters that i need to strip from this element
for example on the first call of $1 it produces 997.flv on the secound call $1.png and outputs a resulting 997.flv.png
i need to strip the .flv part from 997.flv.png to return only 997.png (strip 4 characters from the end of $1 on its secound call - this whould be the same on all resulting files in a directory full of files as this shell script runs)
how can i do this, is it easy or is it complex, any help with this issue would be very usefull, i have tryed searching google, but can not fing out how to strip characters from a varablie in shell scripts
thanks in advance
Last edited by wingchun22; 08-02-2008 at 12:28 AM..
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LEARN ABOUT PHP
arrayobject.natcasesort
ARRAYOBJECT.NATCASESORT(3) 1 ARRAYOBJECT.NATCASESORT(3)
ArrayObject::natcasesort - Sort an array using a case insensitive "natural order" algorithm
SYNOPSIS
public void ArrayObject::natcasesort (void )
DESCRIPTION
This method is a case insensitive version of ArrayObject::natsort.
This method implements a sort algorithm that orders alphanumeric strings in the way a human being would while maintaining key/value asso-
ciations. This is described as a "natural ordering".
PARAMETERS
This function has no parameters.
RETURN VALUES
No value is returned.
EXAMPLES
Example #1
ArrayObject.natcasesort(3) example
<?php
$array = array('IMG0.png', 'img12.png', 'img10.png', 'img2.png', 'img1.png', 'IMG3.png');
$arr1 = new ArrayObject($array);
$arr2 = clone $arr1;
$arr1->asort();
echo "Standard sorting
";
print_r($arr1);
$arr2->natcasesort();
echo "
Natural order sorting (case-insensitive)
";
print_r($arr2);
?>
The above example will output:
Standard sorting
ArrayObject Object
(
[0] => IMG0.png
[5] => IMG3.png
[4] => img1.png
[2] => img10.png
[1] => img12.png
[3] => img2.png
)
Natural order sorting (case-insensitive)
ArrayObject Object
(
[0] => IMG0.png
[4] => img1.png
[3] => img2.png
[5] => IMG3.png
[2] => img10.png
[1] => img12.png
)
For more information see: Martin Pool's Natural Order String Comparison page.
SEE ALSO
ArrayObject::asort, ArrayObject::ksort, ArrayObject::natsort, ArrayObject::uasort, ArrayObject::uksort.
PHP Documentation Group ARRAYOBJECT.NATCASESORT(3)