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UNIX in a Nutshell: System V Edition

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The C Shell
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foreach

foreach name (wordlist)
     commands
end

Assign variable name to each value in wordlist, and execute commands between foreach and end. You can use foreach as a multi-line command issued at the C-shell prompt (first example below), or you can use it in a shell script (second example).

Examples

Rename all files that begin with a capital letter:

% foreach i ([A-Z]*)
? mv $i $i.new
? end

Check whether each command-line argument is an option or not:

foreach arg ($argv)
   # does it begin with - ?
   if ("$arg" =~ -*) then
      echo "Argument is an option"
   else
      echo "Argument is a filename"
   endif
end


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