[bash] Eingabe Aufforderung mit Signal

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Ich bin gerade X11R7.0 am Installieren.
Jetzt Möchte ich in meinem Script gerne vor jeden INSTALL ein Signal mit einer Eingabe Aufforderung haben weiss aber nicht wo ich suchen muss.

#!/bin/sh

DESTDIR=$BUILDDIR

PREFIX=/usr/X11R6

build() {

    cd $1/$2

    echo "### Building $2 with $3 ###"

    EXTRA=$3

    autoreconf -v --install --force -I ${DESTDIR}${PREFIX}/share/aclocal -I .

    if [ -x configure ] ; then
        CFLAGS="-O2 -g -march=i586 -mcpu=i686 -fmessage-length=0" \
        CXXFLAGS="-O2 -g -march=i586 -mcpu=i686 -fmessage-length=0" \
        ./configure --host=i686-suse-linux --build=i686-suse-linux \
        CPPFLAGS="-I${DESTDIR}${PREFIX}/include" \
        --target=i586-suse-linux --program-suffix="" \
        --prefix=/usr/X11R6 --sysconfdir=/etc --libdir=/usr/X11R6/lib \
        --includedir=/usr/X11R6/include --bindir=/usr/X11R6/bin \
        --localstatedir=/var --sharedstatedir=/usr/com \
        --mandir=/usr/X11R6/share/man --infodir=/usr/X11R6/share/info \
          --enable-static=yes --enable-shared=yes ${EXTRA}
    else
        exit 1
    fi

    if [ -r Makefile ] ; then
        gmake -j1
    else
        exit 1
    fi

    gmake DESTDIR=$BUILDDIR install

    cd -
}

build_lib() {
    build lib xtrans
    build lib libXau
    build lib libXdmcp
    build lib libX11 "--enable-loadable-i18n"
    build lib libXext
    build lib libAppleWM
    build lib libWindowsWM
    build lib libdmx
    build lib libfontenc
    build lib libFS
    build lib libICE
    build lib liblbxutil
    build lib liboldX
    build lib libSM
    build lib libXt
    build lib libXmu
    build lib libXpm
    build lib libXp
    build lib libXaw
    build lib libXfixes
    build lib libXcomposite
    build lib libXrender
    build lib libXdamage
    build lib libXcursor
    build lib libXevie
    build lib libXfont
    build lib libXfontcache
    build lib libXft
    build lib libXi
    build lib libXinerama
    build lib libxkbfile
    build lib libxkbui
    build lib libXprintUtil
    build lib libXprintAppUtil
    build lib libXrandr
    build lib libXres
    build lib libXScrnSaver
    build lib libXTrap
    build lib libXtst
    build lib libXv
    build lib libXvMC
    build lib libXxf86dga
    build lib libXxf86misc
    build lib libXxf86vm
}

# The following is required to make pkg-config find our .pc metadata files
if test x"$PKG_CONFIG_PATH" = x; then
    PKG_CONFIG_PATH=${DESTDIR}${PREFIX}/lib/pkgconfig
else
    PKG_CONFIG_PATH=${DESTDIR}${PREFIX}/lib/pkgconfig:${PKG_CONFIG_PATH}
fi
export PKG_CONFIG_PATH

# Set the library path so that locally built libs will be found by apps
if test x"$LD_LIBRARY_PATH" = x; then
    LD_LIBRARY_PATH=${DESTDIR}${PREFIX}/lib
else
    LD_LIBRARY_PATH=${DESTDIR}${PREFIX}/lib:${LD_LIBRARY_PATH}
fi
export LD_LIBRARY_PATH

# Set the path so that locally built apps will be found and used
if test x"$PATH" = x; then
    PATH=${DESTDIR}${PREFIX}/bin
else
    PATH=${DESTDIR}${PREFIX}/bin:${PATH}
fi
export PATH

build_lib