add front matter for jekyll

add_front_matter.sh

#!/bin/bash

dir=`pwd`
list=`find ${dir} -type f`

LF=$(printf '\\\012_')
LF=${LF%_}

for file in $list; do
  filename=`basename $file`
  ext=${filename##*.}
  if [[ $ext == "md" ]]; then
    echo $filename
    # for mac refer to https://markhneedham.com/blog/2011/01/14/sed-sed-1-invalid-command-code-r-on-mac-os-x/
    # `sed -i "" '1i---¥nlayout: default¥n---¥n' $filename`
    `sed -i "" "1s/^/---${LF}layout: default${LF}---${LF}/" $filename`
  fi
done