decode greek sms

decode_sms.sh

#!/bin/sh
  
set -e

if [ -z $1 ]; then
    echo "Usage: $0 file"
    exit 1
fi

OS=$(uname -s)
if [ "${OS}" == "Linux" ]; then
    SED=sed
elif [ "${OS}" == "FreeBSD" ]; then
    SED=gsed
fi

echo '---------------------------------------------------'
echo $1
alphabet=$(grep ^Alphabet: $1| awk '{print $2}')

if [ "$alphabet" == "UTF-8" ]; then
    cat $1 | ${SED} "y/\xc2\x80\xc2\x81\xc2\x82\xc2\x83\xc2\x84\xc2\x85\xc2\x86\xc2\x87\xc2\x88\xc2\x89\xc2\x8a/_ΔΦΓΛΩΠΨΣΘΞ/"
elif [ "$alphabet" == "ISO" ]; then
    cat $1 | ${SED} "y/\x80\x81\x82\x83\x84\x85\x86\x87\x88\x89\x8a\xa4/_ΔΦΓΛΩΠΨΣΘΞ€/"
else
    cat $1
fi
echo
echo '---------------------------------------------------'