Tab completion in irb
irb has 
completion support, you need to activate this by requiring ‘irb/completion’. You can load it when you invoke irb from the command line:
% irb -r irb/completion
Or you can load the completion library when irb is running:
% irb(main):005:0> require 'irb/completion'
If you often use completion then:
Linux users: Can create an alias in .bashrc by following these steps:
- % vi ~/.bashrc
- add
alias irbtc="irb -r 'irb/completion'"
- % source ~/.bashrc
Windows Users: Can create a file named irbtc.bat in your windows\system32 folder as irb -r “irb/completion” the file content.
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Now you can run irb with completion support by:
% irbtc
Example:
% irbtc
irb(main):001:0> st="this is a string"
=> "this is a string"
irb(main):002:0> st.len
irb(main):002:0> st.length
=> 16
irb(main):003:0> st.up
st.upcase st.upcase! st.upto
irb(main):003:0> st.up
or:
require 'irb/completion'in your ~/.ircrc file