Shell Programming and Scripting

hi
this is my question
i have my script what have to verify the existence of a .ZIP file in a extern server (using ftp). if there are .ZIP files, the idea is what the script "unzip" them in the specified folder.

THE PROBLEM IS what the script doen´t unzip the .ZIP files, and besides, delete them (which is terrible).

please help me, i need to know what do i have to do to fix it.
this is the script:

#-----
# Verifica Existencia de Archivo en Servidor Externo
#--
VExiArc()
{
#--------------------------------------------------
# Verifica existencia de archivos ZIP y los descompacta
#--------------------------------------------------
ls ${DTMPINP}/*.zip > ${DTMPINP}/.zip.si
if [ -s "${DTMPINP}/.zip.si" ]; then
for uz in `ls ${DTMPINP}/*.zip`
do
unzip -l $uz|tail -3| head -1|read peso fecha hora nn
narc=`basename $uz`
wzip=".zip"
narc=${narc%%$wzip}
print $narc| awk '{print substr($0,1,8)"."substr($0,9,3)}'|read nok
if [ $nok = $nn ]; then
unzip -u -a -L -j $uz -d /sybase/DTMP/INP
else
nerr=$nn
echo $nok" "$nerr >> ${DTMPINP}/.ftp.nomarc.err
fi
rm $uz
narc=`basename $uz`
BorArc
done
fi
rm ${DTMPINP}/.zip.si



#--------------------------------------------------
# Verifica existencia de archivos en general
#--------------------------------------------------
ls ${DTMPINP}>${DTMPINP}/.ftp.nomarc

if [ -s "${DTMPINP}/.ftp.nomarc" ]; then
EXISTE=$TRUE
fi
}
#-----

unzip must be available on the server, in the chroot ftp directory.