LDD

 

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.  

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/.