$ truss ls -l |& grep stat
...
lstat("Makefile",0x809d24c)                      = 0 (0x0)
lstat("cmp.c",0x809d348)                         = 0 (0x0)
lstat("extern.h",0x809d44c)                      = 0 (0x0)
lstat("ls.1",0x809d548)                          = 0 (0x0)
...