Example script that changes every user password at Liferay DB

ChangeAllLiferayUserPasswords.js

/***
  Example script that changes every user password at Liferay DB to qweqwea
*/

var companyId = 20155;
var users = Packages.com.liferay.portal.service.UserServiceUtil.getCompanyUsers(companyId, -1, -1);

for ( var i = 0 ; i < users.size(); i++ ) {
  var user = users.get(i);
  Packages.com.liferay.portal.service.UserServiceUtil.updatePassword(user.getUserId(), "qweqwe", "qweqwe", false);
}