Sudo can do just that for you:) It needs a bit of configuration though, but once done you would only do this: sudo -u user2 -s And you would be logged in as user2 without entering a password. Configuration To configure sudo, you must edit its configuration file via: visudo. Note: this command will open the configuration using the vi text editor, if you are unconfortable with that, you need to set another editor (using export EDITOR=) before executing the following line. Another command line editor sometimes regarded as easier is nano, so you would do export EDITOR=/usr/bin/nano. You usually need super user privilege for visudo: sudo visudo This file is structured in different section, the aliases, then defaults and finally at the end you have the rules.

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This is where you need to add the new line. So you navigate at the end of the file and add this: user1 ALL=(user2) NOPASSWD: /bin/bash You can replace also /bin/bash by ALL and then you could launch any command as user2 without a password: sudo -u user2. Update I have just seen your comment regarding Skype. You could consider adding Skype directly to the sudo's configuration file. I assume you have Skype installed in your Applications folder: user1 ALL=(user2) NOPASSWD: /Applications/Skype.app/Contents/MacOS/Skype Then you would call from the terminal: sudo -u user2 /Applications/Skype.app/Contents/MacOS/Skype. You can do this two ways, assuming you already have yourusername ALL=NOPASSWD: ALL or similar in your /etc/sudoers or /etc/sudoers.d/username: The traditional way is to use sudo to call su: sudo su user2 -c commandtorunasthatuser As @Huygens noted in, you will need to modify your /etc/sudoers for each user that you want to directly switch to with sudo. Unless you call sudo twice - the first to get root, and then the second to switch to that user ID.

The twosudo`'s below are not a typo: sudo sudo user2 commandtorunasthatuser It's actually interesting to note that the two variants have exactly the same number of keystrokes. So, to do what @Huygens describes in the accepted answer without modifying sudoers, just add another sudo: sudo sudo -u user2 -s.

What is Skype for Business (formerly Lync)?. Skype for Business (formerly Lync) is Microsoft’s unified communication tool for Instant Messaging, Web/Video Conferencing, and Presence information. Note that throughout the middle of 2015, Microsoft will be gradually transitioning all “Lync” branded products over to “Skype for Business”, so you may see boths depending on what operating system and client version you are using. For additional details, please review the press release from Microsoft. Who can use Skype for Business?.

Skype for Business service is enabled for all faculty, staff, and students who have been migrated to the Office 365 service. How do I download and install the Skype for Business Client?. Follow the. If you do not have rights to install software on your office computer, for assistance installing Skype for Business I manually set my presence as available, and now it is not showing that I am in a meeting. How do I correct this?.

Open Skype for Business, click My Status, then click Reset Status. How many people can attend a meeting that I set up in Skype for Business?. Up to 250 people can participate in a Skype for Business meeting at one time.

When I am in a meeting with multiple people, can I view more than one video feed at a time?. By default Skype for Business will display the video feed of the person who is currently speaking and a small preview of your own video feed (if you are sharing your video). You cannot view the video feeds of additional participants. How do I get rid of the Out of Office reply in Skype for Business?.

If you have an out of office reply set on your Office 365 email, it will also be displayed in Skype for Business. To turn it off:.

Sign into Office 365 using your WUSTL Key at. Click on the small Gear icon near the top-right and select Automatic replies. Click the Don’t sent automatic replies button and then click Save. Note: The Out of Office reply can take up to thirty minutes to disappear from the Skype for Business display after it has been turned off in Outlook. Can I create a custom presence status?. The presence states in Skype for Business are pre-set and cannot be modified.

You can write a personal note at the top of the Skype for Business main window to provide details about where you are and what you’re doing. Click the note display area, and then type over the note that is currently displayed. I am sharing a PowerPoint presentation in Skype for Business but it won’t let me edit the slides. How do I correct this?. When you click the Share menu and select PowerPoint Presentation, Skype for Business allows you to show but not edit the presentation.

To edit a PowerPoint presentation while you are sharing it, click Share, select Program, and then select the PowerPoint program. Open your presentation in PowerPoint and you will be able to edit it. I don’t have a webcam. Can I still view video that is shared by other meeting participants?. Although you don’t have a webcam, you can still view other participants’ video feeds. Does Microsoft provide a list of Skype for Business compatible devices?.

Microsoft provides with Skype for Business on its Web site. Can I disable Skype for Business from automatically starting up? Simply follow these instructions:. With Skype for Business open, click the Gear Icon on the right-hand side to automatically open the Options dialog box or click and select Tools then Options. Click Personal from the left-hand panel. Note: The Microsoft Lync Options dialog box for Personal displays on the right-hand side. Deselect Automatically start Skype for Business when I log on to Windowsand Show Skype for Business in foreground when it starts under the My account section.

Click OK Note: Under the section titled Personal information manager, you have the option to make changes to your presence status (which by default is based on your Outlook calendar) and how you want to save your message conversations. Make any desired changes and click OK. How do I start a conference call with multiple contacts?. In the Skype for Business main window, in your Contacts list, hold down the Ctrl key, and then click the contacts that you want to call. Right-click any one of the selected contacts, point to Start a Conference Call, and then click Skype for Business Call How do I add an internal contact to my Contacts list?. In the Skype for Business main window, click the Add a Contact button.

From the dropdown menu, click Add a Contact in my Organization. In the search box, type the person’s, email alias, or phone number. As you type, a list of people who match the search terms is displayed. Scroll through the search returns list until you come to the person you want to add to your Contacts list.

Right-click the person’s search listing, and then click Add to Contacts List. Select a group from the list to add your new contact to.

How do I add a contact from outside of my company to my Contacts list?. In the Skype for Business main window, click the Add a Contact button. From the dropdown menu, click Add a Contact Not in my Organization. On the second drop-down menu, click the Instant Messaging service (Lync, AOL, MSN, Yahoo) your new contact will be using, if you know it.

Otherwise click Other. In the search field of the Add service type Contact, type the email address of the contact. Select a group and a privacy relationship for your new contact, then click OK. How do I block contacts from reaching me via Skype for Business?. Although your and email address are displayed to blocked contacts, they can’t reach you through Skype for Business. To block a contact in Skype for Business: Right-click on the contact you want to block, click Change Privacy Relationship, and then click Blocked Contacts.

How do I delete contacts from my Contacts list?. Right-click the contact you want to delete, and then click Remove from Contacts List. How do I create a group of contacts?.

In the Lync main window, on your Contacts list, right-click any group (for example, Other Contacts), then click Create New Group. Or click the Add a Contact button, and then click Create a New Group.

In the space that now opens up at bottom of the window, type over the phrase New Group to give your group a descriptive. Can I use Lync with Linux?. Lync does not support the Linux operating system. However, by installing Moonlight (an open source implementation of Microsoft Silverlight), you can use Lync Web App to join Lync meetings that have been created by others.