People have a variety of problems with boolean options and negating. Opened this issue to collect the related issues found during triage.

NB: there is an open pull request and I have not yet looked at how well it addresses the issues, but likely to be some documentation work even if functionally solid.

Issues:

• On and off switches are not working #108 On and off switches are not working
• when specifying options, the "--no" version of a flag must appear after the flag #238 when specifying options, the "--no" version of a flag must appear after the flag
• Defining boolean options via Command#option() defaults to undefined, not false. #574 Defining boolean options via Command#option() defaults to undefined, not false.
• Command.opts() values are always undefined #626 Command.opts() values are always undefined
• No way to know if parameter is set with --no- options #630 No way to know if parameter is set with --no- options
• Support defaults for boolean options (including --no-*), for env var set defaults #928 Support defaults for boolean options (including --no-*), for env var set defaults
• Adding negative option makes Commander.js to return "true" when option is not specified #979 Adding negative option makes Commander.js to return "true" when option is not specified

Pull Requests:

• fixes behavior of --no-* options #795 fixes behavior of --no-* options