Tumblr list checker (stage-1)

#!/bin/sh

print() {
  printf '%s' "$1"
}

println() {
  printf '%s\n' "$1"
}

if [ -z "$(which curl)" ]; then
  println 'Curl was not found on your system.'
  println 'Please install it or add the directory it resides in to your PATH.'
  exit 2
fi

if [ -d "$2" ]; then
  println 'You have supplied an existing directory as a destination file.'
  println 'Please supply a proper filename or filepath.'
  exit 1
fi

if [ -f "$2" ]; then
  rm $2
fi

println 'url,status,redirects_to' > $2

printf 'Started cheacking tumblr blogs from list file %s.\n' $1
println 'Progress will be displayed in dots.'

while read -r url; do
  printf '%s,' $url >> $2
  curl -I -L -s -o /dev/null -w '%{http_code},%{url_effective}\n' $url >> $2
  print '.'
done < $1

println
println '[DONE]'

exit 0