Shell Cheatsheet

shell.sh

# looping over array 
for i in "${arrayName[@]}"; do
   # do whatever on $i
done

# Switch-case
case ${ENV} in
  "development") 
    ;;
  "staging")
    ;;
  "production")
    ;;
  *)
    ;;
esac

# ENV validation
case ${ENV} in
   "development") ;;
   "staging") ;;
   "production") ;;
   *)
      echo "ENV should be one of: [development staging production]"
      exit 1
      ;;
esac

# strip prefix from filenames
for f in prefix-*; do mv "$f" "${f#prefix-}"; done