NAME | SYNOPSIS | DESCRIPTION | OPTIONS | NOTES | BUGS | SEE ALSO | COLOPHON

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

NAME         top

       ldd - print shared library dependencies

SYNOPSIS         top

       ldd [OPTION]... FILE...

DESCRIPTION         top

       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         top

       --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         top

       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 locations.  To run it on a
       shared library in the current directory, prefix the name with "./".

BUGS         top

       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         top

       ld.so(8), ldconfig(8)

COLOPHON         top

       This page is part of release 3.64 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)