indent_4_to_2_spaces.sh

#!/bin/bash

###################################################################
## Usage: ./indent_4_to_2_spaces.sh lib/**/*.js www/css/**/*.css ##
###################################################################

echo Re-indenting ${$#-2} files from 4 to 2 spaces...

for (( i=1; i<=$#; i++ )); do
  sed -e 's/^/~/' -e ': r' -e 's/^\( *\)~    /\1  ~/' -e 't r' -e 's/~//' ${!i} > ${!i}.tmp && mv ${!i}.tmp ${!i}
  echo Re-indented ${!i}.
done

@tancredi what about this?

find -name "*.js" | xargs sed -i "s/    /  /g"