[root@Rhel5 sbin]# file poweroff reboot halt
poweroff: symbolic link to `halt'
reboot: symbolic link to `halt'
halt: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), for GNU/Linu
x 2.6.9, dynamically linked (uses shared libs), for GNU/Linux 2.6.9, stripped