aldev:~# strace who
execve("/usr/bin/who", ["who"], [/* 11 vars */]) = 0
arch_prctl(ARCH_SET_FS, 0x6b587a9d7ea8) = 0
set_tid_address(0x6b587a9d7ee0)         = 6132
mprotect(0x6b587a9d6000, 4096, PROT_READ) = 0
mprotect(0x775e39fc000, 16384, PROT_READ) = 0
getuid()                                = 0
exit_group(0)                           = ?
+++ exited with 0 +++
aldev:~# whoami
root
aldev:~# who
aldev:~#