when in Rails irb, how to traverse to beginning/end of line?

when in Rails irb, how to traverse to beginning/end of line?

is it possible to fire up 'irb开发者_Go百科' and have it automatically require some libs?

To move to the beginning/end of a line, you can use Ctrl-A/Ctrl-E or Home/End.

You can place arbitrary Ruby code in ~/.irbrc.