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A couple more for you (with merlyn's clarification), based on what I've learned over the years:

  • Never use programs from Matt's Script Archive? (technically, this goes into the whole 'never run something without understanding what it's doing' category)
  • Never assume that a file/socket/db handle/whatever opened successfully
  • Never write your own CGI parsing routines without a really good reason to avoid CGI or CGI::Lite
  • Never use the single argument form of exec or system
  • Never test for taint by looking for known bad characters. (instead, look if there are any characters that aren't known to be good).
  • Never pass input to exec or system without first checking for taint.
  • Never assume that e-mail happens immediately, or reliably.
  • Never trust a Sicilian when death is on the line
  • Never waste time optimizing your code before you know where the real bottlenecks are. (see Optimization: Your Worst Enemy and Premature Opmization)
  • Never assume that what you're writing is going to be short lived (unless you delete it immediately after writing it).
  • Never forget the importance of descriptive, unambiguous variable, function, and package names, or the importance of comments and documentation

I'll probably have more to add later....

In reply to Re: Never, never, never by jhourcle
in thread Never, never, never by johnnywang

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