Você pode usar strace :
strace -e open command
Exemplo:
$ strace -e open who open("/etc/ld.so.cache", O_RDONLY) = 3 open("/lib/libc.so.6", O_RDONLY) = 3 open("/usr/lib/locale/locale-archive", O_RDONLY) = 3 open("/var/run/utmp", O_RDONLY|O_CLOEXEC) = 3 open("/usr/lib/gconv/gconv-modules.cache", O_RDONLY) = 3 open("/etc/localtime", O_RDONLY) = 3 cyrus console 2011-12-08 15:34 (:0) cyrus :0 2011-12-08 15:34