man(1) Manual page archive

     AR(5)                                                       AR(5)

          ar - archive (library) file format

          #include <ar.h>

          The archive command ar is used to combine several files into
          one.  Archives are used mainly as libraries to be searched
          by the link-editor ld.

          A file produced by ar has a magic string at the start, fol-
          lowed by the constituent files, each preceded by a file
          header.  The magic number and header layout as described in
          the include file are: