rw-arg

Be a good UNIX citizen and follow the conventions with this one weird trick!

var rwArg = require('rwArg')
var input = rwArg.readSync(process.argv[2])

Will:

• if called either without any argument or with '-' as an argument, read input from stdin
• if called with anything else, treat it as a file name to read input from

There are rwArg.read, rwArg.readSync, rwArg.write and rwArg.writeSync. All have the same API rw itself has, except they apply those rules.