rohan-molloy

Check if script is running as root

if [[ $EUID -eq 0 ]]; then
  echo "You are running this script as root"
  read -r -p "Are you sure? [y/N] " response
  case "$response" in
    [yY])
      #do_something $@    
    ;;

*)

rohan-molloy

Print Memory Usage with Awk

Good demo of how to use variables in an awk expression

Memory Usage as a percentage

memused()  
{
    free -b | awk '/Mem/{ total=2; available=NF; print "MemoryUse:",(100.0*(total/available))"%"; }'; 

};

rohan-molloy

Unifi Controller Custom Certificate Installation

1. Convert Certificate + Key to PKCS12 bundle

openssl pkcs12 -export \
               -inkey $KEY \
               -in $CERT \
               -out $BUNDLE \

rohan-molloy

Generate a passphrase

Example "Shake-No-Material-Activity-873"

These passwords are stronger than one might expect. There are 40 billion 267 million 857 thousand 960 different ways to select four words from the list.

A random number between 0..999 is added at the end, increasing the search complexity by several orders of magnitude

genpassphrase() { echo $(curl -fSsL https://raw.githubusercontent.com/rohan-molloy/generate-hostnames/master/words.txt | shuf -n4 | tr '\n' '-')$(($RANDOM%999)); };

rohan-molloy

Install RPM Fusion + Multimedia Codecs (Fedora)

sudo bash <(curl -fSsL https://gist.githubusercontent.com/rohan-molloy/c966f7dd81f805bb3c79ae4032154823/raw/3b9cce5aa9ed882f8a863583aec21c640f4d259f/RunFedoraCodecinstall.sh)

rohan-molloy

Print Docker Volumes by Container

I have quite a few stopped containers. I would like to delete the volumes belonging to some of them. Docker has a volume prune command that will delete ALL the volumes. Annoyingly, it does not have a --dry-run options o you're taking a shot in the dark. I made this snippet to help gain more context.

#!/bin/bash 
for name in $(docker ps -a |awk 'NR>1{print $NF}'); do 
    vols=$(docker inspect $name | jq '.[].Mounts[]|select(.Type=="volume")'|jq -r .Name|tr '\n' ' '); 
    printf "%s=( %s );\n" "$name" "$vols"; 
done

rohan-molloy

# d899b42486eb805b8e432c5758568db487c6bcfc067d6ca7e1292a5a66d66de6  unbound.conf
server:
    # Listen on tcp 443,853
    interface: 0.0.0.0@853
    interface: 0.0.0.0@443

    # Allow from anywhere
    access-control: 0.0.0.0/0 allow 
    access-control: ::0/0 allow 

rohan-molloy

vmware:
    -
        name: 'VMware NSX for vSphere'
        serial: null
        url:
            - 'http://software.onthehub.com/shared/publisher/VMware/VMware-NSX-Manager-6.2.0-2986609.ova'
    -
        name: 'VMware vRealize Suite 7 Enterprise'
        serial: null
        url:

rohan-molloy

# Serve requests only for virtual host set in environment variable 
{$CADDYHOST}

# Bind Virtual Host to address set in environment 
bind {$CADDYBIND}

# Registration email for automated issuing of Lets Encrypt certs
tls {$CADDYEMAIL}

# Define the web server root (using environment variable)

rohan-molloy

Bash function to read the output of a command into a variable

readcmd() { 
  varname="$1";
  cmdline="${@:2}";
  read $varname < <($cmdline)
};