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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.

NOTES
       The  standard  version  of ldd comes with glibc2.  Libc5 came with an older version, still
       present on some systems.  The long options are not supported by the libc5 version.  On the
       other hand, the glibc2 version does not support -V and only has the equivalent --version.

       The libc5 version of this program will use the name of a library given on the command line
       as-is when it contains a '/'; otherwise it searches for the library in the standard  loca-
       tions.  To run it on a shared library in the current directory, prefix the name with "./".

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 sup-
       port 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
       ld.so(8), ldconfig(8)

COLOPHON
       This  page  is  part of release 3.53 of the Linux man-pages project.  A description of the
       project,    and    information    about    reporting    bugs,    can    be    found     at
       http://www.kernel.org/doc/man-pages/.



                                            2012-07-16                                     LDD(1)

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