$ strace -e trace=openat,connect,access,statfs,arch_prctl id
arch_prctl(0x3001 /* ARCH_??? */, 0x7ffc707a7d00) = -1 EINVAL (Invalid argument)
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libselinux.so.1", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libpcre2-8.so.0", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libdl.so.2", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libpthread.so.0", O_RDONLY|O_CLOEXEC) = 3
arch_prctl(ARCH_SET_FS, 0x7f774cbc9440) = 0
statfs("/sys/fs/selinux", 0x7ffc707a7c50) = -1 ENOENT (No such file or directory)
statfs("/selinux", 0x7ffc707a7c50)      = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/proc/filesystems", O_RDONLY|O_CLOEXEC) = 3
access("/etc/selinux/config", F_OK)     = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/locale/locale-archive", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/usr/share/locale/locale.alias", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/usr/share/locale/en_GB/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/share/locale/en/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/share/locale-langpack/en_GB/LC_MESSAGES/coreutils.mo", O_RDONLY) = 3
openat(AT_FDCWD, "/usr/share/locale-langpack/en/LC_MESSAGES/coreutils.mo", O_RDONLY) = 3
connect(3, {sa_family=AF_UNIX, sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
connect(3, {sa_family=AF_UNIX, sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/etc/nsswitch.conf", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libnss_files.so.2", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/etc/passwd", O_RDONLY|O_CLOEXEC) = 3
connect(3, {sa_family=AF_UNIX, sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
connect(3, {sa_family=AF_UNIX, sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/etc/group", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/proc/sys/kernel/ngroups_max", O_RDONLY) = 3
openat(AT_FDCWD, "/proc/sys/kernel/ngroups_max", O_RDONLY) = 3
openat(AT_FDCWD, "/etc/group", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/etc/group", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/etc/group", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/etc/group", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/etc/group", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/etc/group", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/etc/group", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/etc/group", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/etc/group", O_RDONLY|O_CLOEXEC) = 3
uid=1000(rnz) gid=1000(rnz) groups=1000(rnz),4(adm),24(cdrom),27(sudo),30(dip),46(plugdev),121(lpadmin),132(lxd),133(sambashare)
+++ exited with 0 +++