untar.sh

#!/bin/zsh

# Unpack in unique folder
dir=${1}_`uuid`;
mkdir ${dir};
tar vxf $1 -C ${dir};

# Move to working dir if only one folder unpacked
output=${dir};
if [ `find ${dir} -maxdepth 1|wc -l` -eq 2 ]; then
    if [ `find ${dir} -maxdepth 1 -type d|wc -l` -eq 2 ]; then
        _output=`find ${dir} -maxdepth 1`;
        _output=`basename ${_output}`;
        if [ -d ${_output} ]; then; else
            output=${_output};
            mv ${dir}/${output} .;
            rmdir ${dir};
        fi
    fi
fi

echo "$1 was unpacked in ./${output}.";