| LDD(1) | General Commands Manual | LDD(1) | 
ldd —
| ldd | [ -o] [-fformat] program ... | 
ldd displays all shared objects that are needed to run
  the given program. Contrary to
  nm(1), the list includes
  “indirect” dependencies that are the result of needed shared
  objects which themselves depend on yet other shared objects. Zero, one or two
  -f options may be given. The argument is a format
  string passed to rtld(1) and
  allows customization of ldd's output. The first format
  argument is used for library objects and defaults to “\t-l%o.%m =>
  %p\n”. The second format argument is used for non-library objects and
  defaults to “\t%o => %p\n”.
These arguments are interpreted as format strings a la
    printf(3) to customize the
    trace output and allow ldd to be operated as a
    filter more conveniently. The following conversions can be used:
LD_TRACE_LOADED_OBJECTS_PROGNAME in a.out and the
      program name from the argument vector from elf.rtld's library
      search rules.Additionally, \n and \t are recognized and have their usual meaning.
The -o option is an alias for
    -f %a:-l%o.%m => %p\n,
    which makes ldd behave analogously to
    nm -o.
ldd utility exits 0 on success,
  and >0 if an error occurs.
ldd utility first appeared in SunOS 4.0, it appeared
  in its current form in NetBSD 0.9A.
ldd actually runs the program it has been
  requested to analyze which in specially constructed environments can have
  security implications.
| December 25, 2017 | NetBSD 9.4 |