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Linux Programmer's Manual (1)
ldd - print shared library dependencies
prints the shared libraries required by each program or shared library
specified on the command line.
In the usual case,
invokes the standard dynamic linker (see
environment variable set to 1,
which causes the linker to display the library dependencies.
that in some circumstances, some versions of
may attempt to obtain the dependency information
by directly executing the program.
Thus, you should
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
Print the version number of
- -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).
The standard version of
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
and only has the equivalent
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 "./".
does not work on a.out shared libraries.
does not work with some extremely old a.out programs which were
support was added to the compiler releases.
If you use
on one of these programs, the program will attempt to run with
= 0 and the results will be unpredictable.
This page is part of release 3.66 of the Linux
A description of the project,
information about reporting bugs,
and the latest version of this page,
can be found at
- SEE ALSO
This document was created by
using the manual pages.
Time: 21:42:57 GMT, July 12, 2014