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Linux 2.6 - man page for ldd (linux section 1)

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

       ldd - print shared library dependencies

       ldd [OPTION]... FILE...

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

       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

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

	      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.

       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 "./".

       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.

       ld.so(8), ldconfig(8)

       This  page  is  part of release 3.55 of the Linux man-pages project.  A description of the
       project,    and	  information	 about	  reporting    bugs,	can    be    found     at

					    2012-07-16					   LDD(1)

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