<Li> ld--linker, for combining object files </Li> <Li> lib--object - code libraries (installed in / lib or / usr / lib). libc, the system library with C run - time support, was the primary library, but there have always been additional libraries for such things as mathematical functions (libm) or database access . V7 Unix introduced the first version of the modern "Standard I / O" library stdio as part of the system library . Later implementations increased the number of libraries significantly . </Li> <Li> make--build manager (introduced in PWB / UNIX), for effectively automating the build process </Li> <Li> include--header files for software development, defining standard interfaces and system invariants </Li>

When was unix created and who was its main author