• The GNU C Library, Sec. 25, The Basic Program/System Interface
  
  • 25.1 Program Arguments
    • 25.1.1 Program Argument Syntax Conventions
    • 25.1.2 Parsing Program Arguments
  • 25.2 Parsing program options using getopt
    • 25.2.1 Using the getopt function
    • 25.2.2 Example of Parsing Arguments with getopt
    • 25.2.3 Parsing Long Options with getopt_long  (skip this part)
    • 25.2.4 Example of Parsing Long Options with getopt_long  (skip this part)
  • 25.3 Parsing Program Options with Argp  (skip this part)
  • 25.4 Environment Variables
    • 25.4.1 Environment Access
    • 25.4.2 Standard Environment Variables
  • 25.5 System Calls
  • 25.6 Program Termination
    • 25.6.1 Normal Termination
    • 25.6.2 Exit Status
    • 25.6.3 Cleanups on Exit
    • 25.6.4 Aborting a Program
    • 25.6.5 Termination Internals
• APUE, examples of getopt() usage, p. 624 (Fig. 17.37), Sec. 19.5 (pp. 694-695, 696) and pp. 769-770; description of getopt() on pp. 773-774.

• extensive discussion with a complete example

c2html

• a complete example, with makefile