| NAME | SYNOPSIS | DESCRIPTION | OPTIONS | NOTES | BUGS | SEE ALSO | COLOPHON | The Linux Programming Interface |
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 is:
$ objdump -p /path/to/program | grep NEEDED
--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.
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 "./".
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.
ld.so(8), ldconfig(8)
This page is part of release 3.51 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)
HTML rendering created 2013-05-17 by Michael Kerrisk, author of The Linux Programming Interface, maintainer of the Linux man-pages project
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