Shell Programming and Scripting

function restfile() {
# First arg is the file to restore.
# Test if empty, give error if it is, give error.
if [ -z $1 ]; then
    echo "Syntax is: restorefile filename destination";
else
# If they did specify a file, test for it in the trash.
    if [ ! -f /home/username/trashbin/$1 ]; then
#does not exist
        echo "The file does not exist in the trashbin.";
    else
#does exist.
        if [ ! -z $2 ]; then
#did they specify a place to move it to?
#If so, move it there
            echo "Restoring $1 to $2";
            mv /home/username/trashbin/$1 $2
        else
# If not, then move it to the current directory.
            echo "Restoring $1 to home directory.";
            mv /home/username/trashbin/$1 .
        fi
    fi
fi
}