setuid from shellscript isn't permanent

[Mr Aras]

Hi, 

I've got a shell script for installing a binary. In this script I set the
binary to mode 4755. When I 'ls' the binary from within the shell script I
see that it has the setuid bit set. When I exit the shell script, the binary
is no longer setuid.

I can setuid the binary from outside the shell script.

How can I setuid from within a shell script and have it stay that way?

e.g.

$ ./setuid_test_script.sh
mode of `/nfsroot/bin/busybox' changed to 4755 (rwsr-xr-x)
-rwsr-xr-x 1 root root 515956 2008-07-18 11:46 /nfsroot/bin/busybox

$ ls /nfsroot/bin/busybox
-rwxr-xr-x 1 root root 515956 2008-07-18 11:45 /nfsroot/bin/busybox

$ sudo chmod 4755 /nfsroot/bin/busybox

$ ls -al /nfsroot/bin/busybox
-rwsr-xr-x 1 root root 515956 2008-07-18 11:46 /nfsroot/bin/busybox

Aras
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