Also redirect stderr to /dev/null when checking for backend

[Luthaf]

Without this change:

which: no scanelf in (~/bin:/opt/bin:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
ls => /bin/ls (interpreter => /lib64/ld-linux-x86-64.so.2)
    libselinux.so.1 => /lib64/libselinux.so.1
        libpcre.so.1 => /lib64/libpcre.so.1
            libpthread.so.0 => /lib64/libpthread.so.0
        libdl.so.2 => /lib64/libdl.so.2
    libcap.so.2 => /lib64/libcap.so.2
        libattr.so.1 => /lib64/libattr.so.1
    libacl.so.1 => /lib64/libacl.so.1
    libc.so.6 => /lib64/libc.so.6

With this change:

ls => /bin/ls (interpreter => /lib64/ld-linux-x86-64.so.2)
    libselinux.so.1 => /lib64/libselinux.so.1
        libpcre.so.1 => /lib64/libpcre.so.1
            libpthread.so.0 => /lib64/libpthread.so.0
        libdl.so.2 => /lib64/libdl.so.2
    libcap.so.2 => /lib64/libcap.so.2
        libattr.so.1 => /lib64/libattr.so.1
    libacl.so.1 => /lib64/libacl.so.1
    libc.so.6 => /lib64/libc.so.6

[ncopa]

i think the &>/dev/null is bashism and not POSIX shell. We should probably do >/dev/null 2>&1

[ncopa]

Same here. Change to >/dev/null 2>&1

[Luthaf]

Done !

[Luthaf]

ping ?

[ncopa]

thank you