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  1. or download this
    % which touch
    /usr/bin/touch
    
  2. or download this
    `echo "#!/usr/bin/env touch $file" > tmp.sh`;
    
  3. or download this
    `echo "#!\$(which touch) $file" > tmp.sh`;
    
  4. or download this
    `echo "#!/usr/bin/env perl -e 'system \"\$(which touch) $file\"'" > tm
    +p.pl`;
    system './tmp.pl';