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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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