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ecfa6b2734
In the course of debugging the command-line argument refactoring in previous commits, I found I wasn't quite sure whether PSCP thought I'd given it too many arguments, or too few, because it didn't print an error message saying which: it just printed its giant usage message. Over the last few years I've come to the belief that this is Just Wrong anyway. Printing the whole of a giant help message should only be done when the user asked for it: otherwise, print a short and to-the-point error, and maybe _suggest_ how to get help, but scrolling everything else off the user's screen is not a good response to a typo. I wrote this thought up more fully last year: https://www.chiark.greenend.org.uk/~sgtatham/quasiblog/stop-helping/ So, time to practise what I preach! The PuTTY tools now follow the 'Stop helping!' principle. You can get full help by saying --help. Also, when we do print the help, we now exit(0) rather than exit(1), because there's no reason to report failure: we successfully did what the user asked us for.