Handy terminal commands

1. To give approval to open an app on MacOS that Apple is not allowing you to.

Here is the error you will see: "App name" is damaged and cannot be opened. You should move it to the bin.

Command to allow the app to be opened:

xattr -d com.apple.quarantine /path/to/app.app

IMP: Do this only for trusted apps.

A Kubernetes deployment typically uses self-issued certificates, but those can get mismatched etc.

Then when connecting with nodes we start getting the “x509: certificate signed by unknown authority” error message.

One way to fix this is by resetting the certificates.

sudo dpkg-reconfigure ca-certificates

What's an easy quick way to do DNS lookup?

# dig google.com ANY +noall +answer

Try it out and share what you get for your domain?

How to generate a random token on your local machine?

# Best option for a token:

export TOKEN=$(openssl rand -base64 64)

# Fallback for no openssl, on a Linux host:

export TOKEN=$(tr -dc A-Za-z0-9 </dev/urandom | head -c 64)

# Failing that, then try:

export TOKEN=$(head -c 64 /dev/urandom|shasum| cut -d - -f 1)

Then view your token by echo $TOKEN

Sometimes you just need to run a web server on your local system Maybe to try out some front-end code. What's the easiest way to do that?