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/usr/share/highlight/langDefs/ps.lang is in highlight-common 3.8-2.

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The actual contents of the file can be viewed below.

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-- Language definition generated by lang2to3

Description="PostScript"

Keywords={
  { Id=1,
    List={"pop", "exch", "dup", "copy", "roll", "clear", "count", "mark", "cleartomark", "counttomark", "exec", "if", "", "ifelse", "for", "repeat", "loop", "exit", "stop", "stopped", "countexecstack", "execstack", "quit", "start"},
  },
  { Id=2,
    List={"adddiv", "idiv", "mod", "mul", "sub", "abs", "ned", "ceiling", "floor", "round", "truncate", "", "sqrt", "atan", "cos", "sin", "expln", "log", "rand", "srand", "", "rrand", "true", "false", "NULL"},
  },
}

Strings={
  Delimiter=[["|']],
}

IgnoreCase=false

Comments={
  { Block=false,
    Delimiter= { [[%]] },
  },
}

Operators=[[\(|\)|\[|\]|\{|\}|\,|\;|\:|\&|\<|\>|\!|\=|\/|\*|\+|\-]]