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gawk: Ignoring Assigns

 
 10.3.5 Treating Assignments as File names
 -----------------------------------------
 
 Occasionally, you might not want 'awk' to process command-line variable
 assignments (⇒Assignment Options).  In particular, if you have a
 file name that contains an '=' character, 'awk' treats the file name as
 an assignment and does not process it.
 
    Some users have suggested an additional command-line option for
 'gawk' to disable command-line assignments.  However, some simple
 programming with a library file does the trick:
 
      # noassign.awk --- library file to avoid the need for a
      # special option that disables command-line assignments
 
      function disable_assigns(argc, argv,    i)
      {
          for (i = 1; i < argc; i++)
              if (argv[i] ~ /^[a-zA-Z_][a-zA-Z0-9_]*=.*/)
                  argv[i] = ("./" argv[i])
      }
 
      BEGIN {
          if (No_command_assign)
              disable_assigns(ARGC, ARGV)
      }
 
    You then run your program this way:
 
      awk -v No_command_assign=1 -f noassign.awk -f yourprog.awk *
 
    The function works by looping through the arguments.  It prepends
 './' to any argument that matches the form of a variable assignment,
 turning that argument into a file name.
 
    The use of 'No_command_assign' allows you to disable command-line
 assignments at invocation time, by giving the variable a true value.
 When not set, it is initially zero (i.e., false), so the command-line
 arguments are left alone.
 
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