centos man page for ldd

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 exe-
       cutable, 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 locations.  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 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
       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)