Add 'bash/argument_parsing.bash'

bash/argument_parsing.bash

@@ -0,0 +1,30 @@
+#!/bin/bash
+
+while [[ $# -gt 0 ]]; do
+  case "$1" in
+    -a|--all)
+      # set option a/all
+      shift                 # and get the next argument
+      ;;
+    -h|--help)
+      # display help
+      exit                  # because we want to stop
+      ;;
+    -z|--zooper)
+      zooper=$2             # grab the NEXT argument after the -z|--zooper
+      shift                 # throw away the -z|--zooper
+      shift                 # and throw away its value that we've also used
+      ;;
+    -*|--*)
+      echo "We've found an unknown option: $1"
+      # show help if you like
+      shift
+      break                 # stop parsing but allow script to continue, if that's useful
+      ;;
+    *)
+      echo "I don't know how we got here, it shouldn't happen. Should have handled the args or hit the unknowns option just above."
+      exit
+      ;;
+  esac
+done
+