Touch ID Support for sudo in MacOS Terminal for MacBook Pro

Posted on in Categories Link last updated October 31, 2016

Well, that was fast. Touch ID is a fingerprint recognition security feature, designed and released by Apple. It is currently available on the iPhone 5s/6/7 and Macbook pro-2016 editions. Many consider it as a huge security win for the MacBook Pro’s. This sounds amazing feature for command line users.

Say hello to sudo-touchid

sudo-touchid is a fork of sudo with Touch ID support on macOS (powered by the LocalAuthentication framework). Once compiled, it will allow you to authenticate sudo commands with Touch ID in the Terminal on supported Macs (such as the late 2016 MacBook Pros). Since Darwin sources for macOS 10.12 are not available yet, this project is based on sudo sources corresponding to OS X 10.11.6 and obtained from opensource.apple.com.

=> Download and usage information.

Find the oldest file in Unix or Linux file system

Posted on in Categories Link last updated October 28, 2016

So I wanted to know the oldest file on my Debian Linux box.

find / -type f -printf '%T+ %p\n' | sort | head -n 1
Here is an another example for /etc/
find /etc/ -type f -printf '%T+ %p\n' | sort | head -n 10

Find the top 10 oldest file in a directory tree on GNU/Linux
Find the top 10 oldest file in a directory tree on GNU/Linux

So find command finds all files in / and print it with a special format. The %T+ (in -printf) means file’s last modification date and time in separated by +, for example ‘2004-04-28+22:22:05.0’. This is a GNU extension and may not work on other BSD/find or any other version of find. The %p indicts the file name. The sort command sorted input and passed it to head to display the oldest file on my GNU/Linux system. The sort command sorted input and passed it to head to display the oldest file on my GNU/Linux system. Cool, eh?

(Credit: Ubuntu forums).

Forcefully mark down pfSense wan gateway as down

Posted on in Categories Link last updated October 28, 2016

From the article:

I have two internet connections (fiber and 4G LTE) configured in load balanced mode using pfSense FreeBSD based firewall. One of my wan connection is running out of bandwidth quota. How can I force and turn off this interface to save bandwidth until month end and enable it again from next billing cycle?

Read more…

virsh destroy && virsh undefine = Delete a guest VM on Linux KVM after creating it with virt-install

Posted on in Categories Link last updated October 28, 2016

If you created a KVM guest from the command line with first install. Say, after sometimes you do not need a guest VM. However, how do you I delete this KVM guest from the command line? The answer is simple:

virsh destroy VM_NAME && virsh undefine VM_NAME

Of course as usual stuff in IT may get complicated. See “how to delete a guest on Linux KVM for more info“.