diff --git a/scrape.sh b/scrape.sh
index d31b82b..d468873 100755
--- a/scrape.sh
+++ b/scrape.sh
@@ -6,69 +6,32 @@ function usage {
 
   Scrape facebook event pages.
 
-  This script will always return an JSON array.
-
   OPTIONS:
     -h --help -?                      print usage
+    --events                          File in JSON format that contains an array
+                                      of prevously parsed events.
     -p --page                         Facebook page id. Scrape all events of a
                                       specific facebook page.
     --pages                           List of Facebook page ids. See examples for
                                       format.
+    -o --output                       Output events into this path instead of
+                                      stdout.
+
   NOTE:
   Events and pages needs to be public. Private events or pages are not yet
   supported.
 
   EXAMPLES:
+  ./scrape.sh -p livesentralen > events.json
+  ./scrape.sh -p livesentralen -o events.json --events=events.json
 EOF
 }
 
-event_ids="";
-pages_ids="";
-
-function scrape_event {
-  local event_id;
-  event_id="$1"
-  if [ "" == "${event_ids}" ]; then
-    event_ids="${event_id}"
-  else
-    event_ids="${event_ids},${event_id}"
-  fi
-}
-
-function scrape_page {
-  local page_id;
-  page_id="$1"
-  if [ "" == "${pages_ids}" ]; then
-     pages_ids="${page_id}"
-  else
-    pages_ids="${pages_ids},${page_id}"
-  fi
-}
-
 function parse_args {
   if [ "$1" = "" ]; then
     usage
     exit 0
   fi
-
-  while [[ $# -gt 0 ]]; do
-    key="$1"
-    case $key in
-      -e|--event|--events)
-        shift
-        scrape_event "$1"
-        ;;
-      -p|--page|--pages)
-        shift
-        scrape_page "$1"
-        ;;
-      *)
-        usage
-        exit 1
-        ;;
-    esac
-    shift
-  done
 }
 
 function install_node_dependencies {
@@ -101,9 +64,9 @@ function check_dependencies {
 }
 
 function scrape {
-  exec node scrape.js --event_ids="${event_ids}" --page_ids="${pages_ids}"
+  node src/scrape.js "$1" || usage
 }
 
 check_dependencies \
   && parse_args "$@" \
-  && scrape
+  && scrape "$@"
diff --git a/src/logic.js b/src/logic.js
index 7a573c8..4375f83 100644
--- a/src/logic.js
+++ b/src/logic.js
@@ -1,6 +1,36 @@
+const { pathOr, hasPath } = require('ramda');
+const parseArgs = require('minimist');
+const process = require('process');
+
 export const event_url = (event_id) =>
   `https://www.facebook.com/events/${event_id}`;
 
 const page_url = (page_id) => `https://www.facebook.com/${page_id}`;
 
 export const page_events_url = (page_id) => page_url(page_id) + '/events/';
+
+export const parse_args = (args) => {
+  const argv = parseArgs(args);
+
+  const has_help_param =
+    hasPath(['h'], argv) || hasPath(['help'], argv) || hasPath(['?'], argv);
+  if (has_help_param) {
+    process.exit(1);
+  }
+
+  const away_empty_strings = (str) => str.length !== 0;
+  const page_id_to_page_events_url = page_events_url;
+  const parse_param = (param) =>
+    pathOr('', [param], argv)
+      .split(',')
+      .filter(away_empty_strings)
+      .map(page_id_to_page_events_url);
+
+  return {
+    page_ids: [
+      ...parse_param('page'),
+      ...parse_param('p'),
+      ...parse_param('pages'),
+    ],
+  };
+};
diff --git a/src/scrape.js b/src/scrape.js
index fe00f05..dc5dc43 100644
--- a/src/scrape.js
+++ b/src/scrape.js
@@ -1,6 +1,5 @@
 const puppeteer = require('puppeteer');
 const { pathOr, unionWith, prop, eqBy, maxBy } = require('ramda');
-const parse_args = require('minimist');
 const url = require('url');
 const path = require('path');
 const fs = require('fs').promises;
@@ -141,12 +140,7 @@ const open_browser = async (images_directory) => {
   return browser;
 };
 
-const argv = parse_args(process.argv.slice(2));
-const page_ids = pathOr('', ['page_ids'], argv)
-  .split(',')
-  .filter((str) => str.length !== 0)
-  .map(page_events_url);
-
+const { page_ids } = parse_args(process.argv.slice(2));
 const register_upcoming_events_listener = (endpoint, page) => {
   let responses = [];
   return new Promise((resolve, reject) => {
diff --git a/tests/logic.test.js b/tests/logic.test.js
new file mode 100644
index 0000000..877a7c1
--- /dev/null
+++ b/tests/logic.test.js
@@ -0,0 +1,32 @@
+import { parse_args } from '../src/logic';
+
+const process = require('process');
+const process_mock = jest.spyOn(process, 'exit').mockImplementation(() => true);
+
+describe('test parse args', () => {
+  it('parses a single page id with -p', () => {
+    const res = parse_args(['-p', 'foo']);
+    expect(res).toEqual({ page_ids: ['https://www.facebook.com/foo/events/'] });
+  });
+
+  it('parses a single page id with --page', () => {
+    const res = parse_args(['--page=foo']);
+    expect(res).toEqual({ page_ids: ['https://www.facebook.com/foo/events/'] });
+  });
+
+  it('parses multiple page ids with --pages', () => {
+    const res = parse_args(['--pages=foo,bar']);
+    expect(res).toEqual({
+      page_ids: [
+        'https://www.facebook.com/foo/events/',
+        'https://www.facebook.com/bar/events/',
+      ],
+    });
+  });
+  ['-?', '--help', '-h'].forEach((param) => {
+    it('parses help options', () => {
+      const res = parse_args([param]);
+      expect(process_mock).toHaveBeenCalledWith(1);
+    });
+  });
+});