LDD(1)                     Linux Programmer's Manual                    LDD(1)



NAME
       ldd - print shared library dependencies

SYNOPSIS
       ldd [option]... file...

DESCRIPTION
       ldd  prints  the  shared  libraries  required by each program or shared
       library specified on the command line.

   Security
       In the usual  case,  ldd  invokes  the  standard  dynamic  linker  (see
       ld.so(8))  with the LD_TRACE_LOADED_OBJECTS environment variable set to
       1, which causes the linker to display  the  library  dependencies.   Be
       aware,  however,  that  in some circumstances, some versions of ldd may
       attempt to obtain the dependency information by directly executing  the
       program.  Thus, you should never employ ldd on an untrusted executable,
       since this may result in the execution  of  arbitrary  code.   A  safer
       alternative when dealing with untrusted executables is:

           $ objdump -p /path/to/program | grep NEEDED

OPTIONS
       --version
              Print the version number of ldd.

       -v --verbose
              Print all information, including, for example, symbol versioning
              information.

       -u --unused
              Print unused direct dependencies.  (Since glibc 2.3.4.)

       -d --data-relocs
              Perform relocations and report any missing objects (ELF only).

       -r --function-relocs
              Perform relocations for both data  objects  and  functions,  and
              report any missing objects or functions (ELF only).

       --help Usage information.

BUGS
       ldd does not work on a.out shared libraries.

       ldd  does  not  work  with some extremely old a.out programs which were
       built before ldd support was added to the compiler  releases.   If  you
       use  ldd on one of these programs, the program will attempt to run with
       argc = 0 and the results will be unpredictable.

SEE ALSO
       sprof(1), pldd(1), ld.so(8), ldconfig(8)

COLOPHON
       This page is part of release 3.74 of the Linux  man-pages  project.   A
       description  of  the project, information about reporting bugs, and the
       latest    version    of    this    page,    can     be     found     at
       http://www.kernel.org/doc/man-pages/.



                                  2014-10-02                            LDD(1)
