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

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-- FIXME omitted definition of $KEYWORDS(KWA)
-- Language definition generated by lang2to3

Description="TCSH"

Identifiers=[[ [a-zA-Z_\@][\w\-]* ]]

Keywords={
  { Id=1,
    List={"return", "if", "endif", "then", "else", "switch", "endsw", "while", "end", "foreach", "do", "done", "", "eval", "exec", "exit", "fg", "goto", "glob", "hashstat", "history", "jobs", "kill", "limit", "login", "logout", "nohup", "notify", "nice", "onintr", "popd", "pushd", "printenv", "read", "rehash", "repeat", "set", "setenv", "shift", "source", "suspend", "time", "umask", "unalias", "unhash", "unlimit", "unset", "unsetenv", "wait", "alloc", "bindkey", "builtins", "complete", "echotc", "filetest", "hup", "log", "sched", "settc", "setty", "stop", "telltc", "uncomplete", "where", "which", "dirs", "ls-F", "@"},
  },
  { Id=2,
    Regex=[[\$\S+]],
  },
  { Id=3,
    Regex=[[(\$\{\w+\})]],
  },

}

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

IgnoreCase=false

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

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