Programming Forums - Bad interpreter?

#!/bin/sh

# Installer for Nexuiz 1.5 on GNU/Linux.

#confirm download

{

        printf "Welcome to the Nexuiz 1.5 for GNU/Linux installer!\nWARNING! Nexuiz's download is 178MB, so should take at least a few minutes. Really continue? "

        read dl

        dl="`echo $dl|tr 'A-Z' 'a-z'`"

        if [ "$dl" != "y" ] && [ "$dl" != "yes" ]; then

                exit

        fi

}



#make sure $installdir is global

installdir=''



#download and extract

{

        get_installdir ()

        {

                printf "Where do you want to install Nexuiz? If you do not enter anything, Nexuiz will be installed to /usr/local/games/. "

                read installdir

                if [ -z "$installdir" ]; then

                        installdir="/usr/local/games/"

                fi

                if [ ! -d "$installdir" ]; then

                        printf "Error! $installdir is not a directory!\n"

                        get_installdir

                fi

                if [ ! -w "$installdir" ]; then

                        printf "Error! You do not have write permission in $installdir!\n"

                        get_installdir

                fi

                #remove trailing /

                {

                        if  [ "echo ${installdir:`expr ${#installdir} - 1`}" == "/" ]; then

                                installdir="${installdir:0:`expr ${#installdir} - 1`}"

                        fi

                }

        }

        get_installdir

        cd $installdir

        #wget http://easynews.dl.sourceforge.net/s.../nexuiz-15.zip

        printf "Extracting archive...\n"

        unzip nexuiz-15.zip

}



#remove unneeded stuff

{

        #archive

        {

                printf "Keep 178MB downloaded archive? "

                read archive

                archive="`echo $archive|tr 'A-Z' 'a-z'`"

                if [ "$archive" != "y" ] || [ "$archive" != "yes" ]; then

                        rm nexuiz-15.zip

                fi

        }

        #check CPU architecture

                if [ "`uname -m`" == "i686" ]; then

                        arch="686"

                        notarch="x86_64"

                elif [ "`uname -m`" == "x86_64" ]; then

                        arch="x86_64"

                        notarch="686"

                else

                        echo "Error! Your CPU architecture is not supported by the prebuilt Nexuiz binaries. You might be able to compile Nexuiz yourself. Instructions on the WWW at http://www.alientrap.org/forum/viewtopic.php?p=353#353\n"

                        exit 1

                fi

        #ask for source

        {

                printf "Keep source? "

                read source

                source="`echo $source|tr 'A-Z' 'a-z'`"

                if [ "$source" != "y" ] || [ "$source" != "yes" ]; then

                        source='*source*'

                fi

        }

        #remove files

        {

                cd Nexuiz

                rm -rf *exe* *dll* *.app* "$source" "nexuiz-linux-$notarch-sdl" "nexuiz-linux-$notarch-dedicated" nexuiz-linux.sh

        }

        #remove unneeded things in binary names

        {

                mv -f nexuiz-linux-$arch-sdl nexuiz-sdl

                mv -f nexuiz-linux-$arch-dedicated nexuiz-dedicated

        }

}



#create starter scripts

{

        cd ..

        printf "#\!/bin/sh\ncd $installdir/Nexuiz\n./nexuiz-sdl \$@\n">nexuiz-sdl

        printf "#\!/bin/sh\ncd $installdir/Nexuiz\n./nexuiz-dedicated \$@\n">nexuiz-dedicated

        ln -fs nexuiz-sdl nexuiz

}



#display GGPL

{

        printf "Nexuiz license (the GGPL) will display in 3 seconds. Hit \"q\" to exit it.\n"

        sleep 3

        #for the few systems without less

        {

                whereis less>/dev/null

                if [ "$?" == "0" ]; then

                        viewer="less"

                else

                        viewer="more"

                fi

        }

        $viewer Nexuiz/gpl.txt

}



#leaving message

{

        case $PATH in

                *$installdir*)

                        printf "Nexuiz installed! Just enter \"nexuiz\" to play Nexuiz. You can also use \"nexuiz-dedicated\" to start a dedicated server or \"nexuiz-sdl\".\n";;

                *)

                        printf "Nexuiz installed! However $installdir is not in your \$PATH.\n";;

        esac

}

When I try to run it:

notroot[0:scripts]& NexuizInstaller

: bad interpreter: No such file or directoryin/sh

notroot[0:scripts]&

It doesn't make a difference if I use /bin/sh or /bin/bash.

Other shell scripts work fine. I've no clue what's wrong.