Is it possible to detect 32 bit vs 64 bit in a bash script? [duplicate]

Answer 1

You can use , the follow script (i extract this from officially script of "ioquake3") : for example

archs=`uname -m`
case "$archs" in
    i?86) archs=i386 ;;
    x86_64) archs="x86_64 i386" ;;
    ppc64) archs="ppc64 ppc" ;;
esac

for arch in $archs; do
    test -x ./ioquake3.$arch || continue
    exec ./ioquake3.$arch "$@"
done

==================================================================================

I'm making a script to detect the "Architecture", this is my simple code (I am using it with wine , for my Windows Games , under Linux , by each game , i use diferrent version of WineHQ, downloaded from "PlayOnLinux" site.

# First Obtain "kernel" name
KERNEL=$(uname -s)

if      [ $KERNEL = "Darwin" ]; then
        KERNEL=mac
elif        [ $Nucleo = "Linux" ]; then
        KERNEL=linux
elif        [ $Nucleo = "FreeBSD" ]; then
        KERNEL=linux
else
        echo "Unsupported OS"
fi

# Second get the right Arquitecture
ARCH=$(uname -m)

if         [ $ARCH = "i386" ]; then
            PATH="$PWD/wine/$KERNEL/x86/bin:$PATH"
            export WINESERVER="$PWD/wine/$KERNEL/x86/bin/wineserver"
            export WINELOADER="$PWD/wine/$KERNEL/x86/bin/wine"
            export WINEPREFIX="$PWD/wine/data"
            export WINEDEBUG=-all:$WINEDEBUG
            ARCH="32 Bits"
    elif    [ $ARCH = "i486" ]; then
            PATH="$PWD/wine/$KERNEL/x86/bin:$PATH"
            export WINESERVER="$PWD/wine/$KERNEL/x86/bin/wineserver"
            export WINELOADER="$PWD/wine/$KERNEL/x86/bin/wine"
            export WINEPREFIX="$PWD/wine/data"
            export WINEDEBUG=-all:$WINEDEBUG
            ARCH="32 Bits"
    elif    [ $ARCH = "i586" ]; then
            PATH="$PWD/wine/$KERNEL/x86/bin:$PATH"
            export WINESERVER="$PWD/wine/$KERNEL/x86/bin/wineserver"
            export WINELOADER="$PWD/wine/$Nucleo/x86/bin/wine"
            export WINEPREFIX="$PWD/wine/data"
            export WINEDEBUG=-all:$WINEDEBUG
            ARCH="32 Bits"
    elif    [ $ARCH = "i686" ]; then
            PATH="$PWD/wine/$KERNEL/x86/bin:$PATH"
            export WINESERVER="$PWD/wine/$KERNEL/x86/bin/wineserver"
            export WINELOADER="$PWD/wine/$KERNEL/x86/bin/wine"
            export WINEPREFIX="$PWD/wine/data"
            export WINEDEBUG=-all:$WINEDEBUG
            ARCH="32 Bits"
         elif [ $ARCH = "x86_64" ]; then
            export WINESERVER="$PWD/wine/$KERNEL/x86_64/bin/wineserver"
            export WINELOADER="$PWD/wine/$KERNEL/x86_64/bin/wine"
            export WINEPREFIX="$PWD/wine/data"
            export WINEDEBUG=-all:$WINEDEBUG
            ARCH="64 Bits"
    else
        echo "Unsoportted Architecture"
fi

==================================================================================

Now i use this in my bash scripts , because works better in any distro .

# Get the Kernel Name
Kernel=$(uname -s)
case "$Kernel" in
    Linux)  Kernel="linux"              ;;
    Darwin) Kernel="mac"                ;;
    FreeBSD)    Kernel="freebsd"            ;;
* ) echo "Your Operating System -> ITS NOT SUPPORTED"   ;;
esac

echo
echo "Operating System Kernel : $Kernel"
echo
# Get the machine Architecture
Architecture=$(uname -m)
case "$Architecture" in
    x86)    Architecture="x86"                  ;;
    ia64)   Architecture="ia64"                 ;;
    i?86)   Architecture="x86"                  ;;
    amd64)  Architecture="amd64"                    ;;
    x86_64) Architecture="x86_64"                   ;;
    sparc64)    Architecture="sparc64"                  ;;
* ) echo    "Your Architecture '$Architecture' -> ITS NOT SUPPORTED."   ;;
esac

echo
echo "Operating System Architecture : $Architecture"
echo

Answer 2

Be careful, in a chrooted 32-bit env, the uname is still answering like the 64-bit host system.

getconf LONG_BIT works fine.

file /bin/cp or any well-known executable or library should do the trick if you don't have getconf (but you can store programs you can't use, and maybe there are not at this place).