LDD(1) Linux Programmer's Manual LDD(1)NAMEldd - print shared library dependencies
SYNOPSISldd [OPTION]... FILE...
DESCRIPTIONldd 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
Print the version number of ldd.
Print all information, including, for example, symbol versioning
Print unused direct dependencies. (Since glibc 2.3.4.)
Perform relocations and report any missing objects (ELF only).
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 "./".
BUGSldd 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 ALSOld.so(8), ldconfig(8)COLOPHON
This page is part of release 3.54 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/.