Build RerwiteRules from CSV

build_redirect.sh

#!/bin/bash

# Pass in a csv file from STDIN as follows. No spaces.
#
# pattern,substitution
# pattern,substitution

if ! [ -t 0 ]; then
  STDIN=`cat /dev/stdin`
fi

if [ -z "$STDIN" ]; then

  FROM=$1
  TO=$2

  RULE="RewriteRule ${FROM} ${TO} [R=301,L]"
  echo $RULE
  exit 0
else
  for i in $STDIN; do
    echo "RewriteRule ^${i%,*}$ ${i#*,} [R=301,L]"
  done
fi