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LDD(1)                     Linux Programmer's ManualLDD(1)NAME       ldd - print shared object dependenciesSYNOPSIS       ldd [option]... file...DESCRIPTION       ldd  prints the shared objects (shared libraries) required by each pro-       gram or shared object specified on the command line.  An example of its       use and output is the following:         $ ldd /bin/ls                 linux-vdso.so.1 (0x00007ffcc3563000)                 libselinux.so.1 => /lib64/libselinux.so.1 (0x00007f87e5459000)                 libcap.so.2 => /lib64/libcap.so.2 (0x00007f87e5254000)                 libc.so.6 => /lib64/libc.so.6 (0x00007f87e4e92000)                 libpcre.so.1 => /lib64/libpcre.so.1 (0x00007f87e4c22000)                 libdl.so.2 => /lib64/libdl.so.2 (0x00007f87e4a1e000)                 /lib64/ld-linux-x86-64.so.2 (0x00005574bf12e000)                 libattr.so.1 => /lib64/libattr.so.1 (0x00007f87e4817000)                 libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f87e45fa000)       In  the  usual  case,  ldd  invokes  the  standard  dynamic linker (seeld.so(8)) with the LD_TRACE_LOADED_OBJECTS environment variable set  to       1.  This causes the dynamic linker to inspect the program's dynamic de-       pendencies, and find (according to the rules described inld.so(8)) and       load the objects that satisfy those dependencies.  For each dependency,       ldd displays the location of the matching object and the  (hexadecimal)       address at which it is loaded.  (The linux-vdso and ld-linux shared de-       pendencies are special; seevdso(7) andld.so(8).)   Security       Be aware that in some circumstances (e.g., where the program  specifies       an  ELF  interpreter  other than ld-linux.so), some versions of ldd may       attempt to obtain the dependency information by attempting to  directly       execute  the  program, which may lead to the execution of whatever code       is defined in the program's ELF interpreter, and perhaps  to  execution       of  the  program  itself.  (In glibc versions before 2.27, the upstream       ldd implementation did this for example,  although  most  distributions       provided a modified version that did not.)       Thus,  you  should  never  employ ldd on an untrusted executable, since       this may result in the execution of arbitrary code.  A  safer  alterna-       tive when dealing with untrusted executables is:           $ objdump -p /path/to/program | grep NEEDED       Note, however, that this alternative shows only the direct dependencies       of the executable, while ldd shows the entire dependency  tree  of  the       executable.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 re-              port 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.SEE ALSOpldd(1),sprof(1),ld.so(8),ldconfig(8)COLOPHON       This page is part of release 5.05 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       https://www.kernel.org/doc/man-pages/.                                  2019-03-06LDD(1)