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  1. Don't reinvent the wheel

    There could already exist some tool for doing what you need.

  2. Check your history files

    grep mycommand .*history
    
  3. Don't use command line arguments or environment variables to store sensible datas (like password)!

    Always use fd (file descriptors)! Try

    ps axefwww
    

    to read all command lines and environment, currently running on your host