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.Dd September 7, 2009 .Dt LDD 1 .Os .Sh NAME .Nm ldd .Nd list dynamic object dependencies .Sh SYNOPSIS .Nm .Op Fl o .Op Fl f Ar format .Ar program ... .Sh DESCRIPTION .Nm displays all shared objects that are needed to run the given program. Contrary to .Xr nm 1 , the list includes .Dq indirect dependencies that are the result of needed shared objects which themselves depend on yet other shared objects. Zero, one or two .Fl f options may be given. The argument is a format string passed to .Xr rtld 1 and allows customization of .Nm ldd Ns 's output. The first format argument is used for library objects and defaults to .Qq "\et-l%o.%m =\*[Gt] %p\en" . The second format argument is used for non-library objects and defaults to .Qq "\et%o =\*[Gt] %p\en" .
p These arguments are interpreted as format strings a la .Xr printf 3 to customize the trace output and allow .Nm to be operated as a filter more conveniently. The following conversions can be used: l -tag -width xxxx t %a The main program's name
o also known as .Dq __progname
c . t %A The value of the environment variable .Ev LD_TRACE_LOADED_OBJECTS_PROGNAME in a.out and the program name from the argument vector from elf. t %o The library name. t %m The library's major version number. t %n The library's minor version number (a.out only, ignored in elf). t %p The full pathname as determined by .Nm rtld Ns 's library search rules. t %x The library's load address .El
p Additionally, .Sy \en and .Sy \et are recognized and have their usual meaning.
p The .Fl o option is an alias for .Fl f .Ar %a:-l%o.%m =\*[Gt] %p\en , which makes .Nm behave analogously to c nm Fl o . .Sh SEE ALSO .Xr ld 1 , .Xr ld.elf_so 1 , .Xr nm 1 , .Xr rtld 1 .Sh HISTORY A .Nm utility first appeared in SunOS 4.0, it appeared in its current form in .Nx 0.9a . .Sh BUGS The a.out .Nm actually runs the program it has been requested to analyze which in specially constructed environments can have security implications.