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LDD(1)                                                                  LDD(1)

NAME
       ldd - print shared library dependencies

SYNOPSIS
       ldd [OPTION]...  FILE...

DESCRIPTION
       ldd prints the shared libraries required by each program or shared library specified on the command line.

OPTIONS
       --version
              Print the version number of ldd.

       -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).

       --help Usage information.

NOTES
       The standard version of ldd comes with glibc2. Libc5 came with an older version, still present  on  some  sys-
       tems. 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  con-
       tains 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 "./".

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 ALSO
       ld.so(8), ldconfig(8)

Linux Programmer’s Manual       30 October 2000                         LDD(1)

AR(1)                        GNU Development Tools                       AR(1)

NAME
       ar - create, modify, and extract from archives

SYNOPSIS
       ar [-X32_64] [-]p[mod [relpos] [count]] archive [member...]

DESCRIPTION
       The  GNU ar program creates, modifies, and extracts from archives.  An archive is a single file holding a col-
       lection of other files in a structure that makes it possible to retrieve the original individual files (called
       members of the archive).

       The  original  files’  contents, mode (permissions), timestamp, owner, and group are preserved in the archive,
       and can be restored on extraction.

       GNU ar can maintain archives whose members have names of any length; however, depending on how ar  is  config-
       ured on your system, a limit on member-name length may be imposed for compatibility with archive formats main-
       tained with other tools.  If it exists, the limit is often 15 characters (typical of formats related to a.out)
       or 16 characters (typical of formats related to coff).

       ar  is considered a binary utility because archives of this sort are most often used as libraries holding com-
       monly needed subroutines.

       ar creates an index to the symbols defined in relocatable object modules in the archive when you  specify  the
       modifier  s.   Once  created,  this index is updated in the archive whenever ar makes a change to its contents
       (save for the q update operation).  An archive with such an index speeds up linking to the library, and allows
       routines in the library to call each other without regard to their placement in the archive.

       You  may  use nm -s or nm --print-armap to list this index table.  If an archive lacks the table, another form
       of ar called ranlib can be used to add just the table.