Linux/strace

Что происходит при запуске strace chown root /bin/ps 2>&1 | less

ctory) open("/usr/share/locale-langpack/en/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory) write(2, ": Operation not permitted", 25: Operation not permitted) = 25 write(2, "\n", 1