There are two kinds of path names absolute and relative . Absolute path names specify the path to a file or directory starting from the root directory. Absolute path names. Relative path names specify directories and files starting from your current directory. Clearly most users would not wish this and the HP-UX system supports mechanisms to prevent this.
All programming languages are artificial.
Each has a limited vocabulary, an explicitly defined grammar, and well-formed rules of syntax and semantics. We have seen that a program instruction comprises a particular combination of binary digits. Such codes are referred to as machine or instruction codes. At this level a computer has a basic repertoire of instructions that it can perform, known as the instruction set . In the early days of computer programming all programs had to be written in machine code.