Unix for Beginners
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ldd - Unix, Linux Command
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.
Print the version number of
-v --verbose |
Print all information, including e.g. symbol versioning information.
-u --unused ||
Print unused direct dependencies.
-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
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
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
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.