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