How can I pass to IRB if I don't specify ?

Question

Since:

irb --help

Usage: irb.rb [options] [programfile] [arguments]

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I know I can pass arguments to ARGV if I include a prog

Answer 1

You can make a file that modifies ARGV and then use '-r' to include it.

$ echo 'ARGV = ["testing", "1","2","3"]' > ~/blah.rb && irb -r ./blah test.rb 
/home/me/blah.rb:1: warning: already initialized constant ARGV
test.rb(main):001:0> require 'pp'
=> true
test.rb(main):002:0* pp ARGV
["testing", "1", "2", "3"]
=> ["testing", "1", "2", "3"]
test.rb(main):003:0> 

You could even redirect it to your your ~/.irbrc and leave out the '-r ./blah'.