Cygwin and irb
If you had tried to start irb in Windows that has cygwin installed, you might have got the following exception trace:
C:/Ruby192/lib/ruby/site_ruby/1.9.1/rbreadline.rb:2095:in `expand_path': non-absolute home (ArgumentError) from C:/Ruby192/lib/ruby/site_ruby/1.9.1/rbreadline.rb:2095:in `_rl_read_init_file' from C:/Ruby192/lib/ruby/site_ruby/1.9.1/rbreadline.rb:2078:in `rl_read_init_file' from C:/Ruby192/lib/ruby/site_ruby/1.9.1/rbreadline.rb:2499:in `readline_initialize_everything' from C:/Ruby192/lib/ruby/site_ruby/1.9.1/rbreadline.rb:3730:in `rl_initialize' from C:/Ruby192/lib/ruby/site_ruby/1.9.1/rbreadline.rb:4737:in `readline' from C:/Ruby192/lib/ruby/site_ruby/1.9.1/readline.rb:40:in `readline' from C:/Ruby192/lib/ruby/1.9.1/irb/input-method.rb:115:in `gets' from C:/Ruby192/lib/ruby/1.9.1/irb.rb:139:in `block (2 levels) in eval_input' from C:/Ruby192/lib/ruby/1.9.1/irb.rb:273:in `signal_status' from C:/Ruby192/lib/ruby/1.9.1/irb.rb:138:in `block in eval_input' from C:/Ruby192/lib/ruby/1.9.1/irb/ruby-lex.rb:188:in `call' from C:/Ruby192/lib/ruby/1.9.1/irb/ruby-lex.rb:188:in `buf_input' from C:/Ruby192/lib/ruby/1.9.1/irb/ruby-lex.rb:103:in `getc' from C:/Ruby192/lib/ruby/1.9.1/irb/slex.rb:205:in `match_io' from C:/Ruby192/lib/ruby/1.9.1/irb/slex.rb:75:in `match' from C:/Ruby192/lib/ruby/1.9.1/irb/ruby-lex.rb:286:in `token' from C:/Ruby192/lib/ruby/1.9.1/irb/ruby-lex.rb:262:in `lex' from C:/Ruby192/lib/ruby/1.9.1/irb/ruby-lex.rb:233:in `block (2 levels) in each_top_level_statement' from C:/Ruby192/lib/ruby/1.9.1/irb/ruby-lex.rb:229:in `loop' from C:/Ruby192/lib/ruby/1.9.1/irb/ruby-lex.rb:229:in `block in each_top_level_statement' from C:/Ruby192/lib/ruby/1.9.1/irb/ruby-lex.rb:228:in `catch' from C:/Ruby192/lib/ruby/1.9.1/irb/ruby-lex.rb:228:in `each_top_level_statement' from C:/Ruby192/lib/ruby/1.9.1/irb.rb:155:in `eval_input' from C:/Ruby192/lib/ruby/1.9.1/irb.rb:70:in `block in start' from C:/Ruby192/lib/ruby/1.9.1/irb.rb:69:in `catch' from C:/Ruby192/lib/ruby/1.9.1/irb.rb:69:in `start' from C:/Ruby192/bin/irb:12:in `The solution to this problem is very simple. Just unset the HOME environment variable and start irb again.'
set HOME= set HOMEDRIVE= set HOMEPATH= set HOMESHARE=Some of them are not directly related to Cygwin. But resetting will help you in avoiding issues while running gems.
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