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Korn Shell: Unix and Linux Programming Manual, Third Edition, The by Anatole Olczak

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Miscellaneous

# anything following a # to the end of the current line is treated as a comment and ignored
#!interpreter if the first line of a script starts with this, then the script is run by the specified interpreter
rsh running under the restricted shell is equivalent to ksh, except that the following is not allowed:
  • changing directories

  • setting value of ENV, PATH, or SHELL

  • specifying path or command names containing /

  • redirecting command output command with >, >|, <>, or >>

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