Update all Proxmox containers

pct-update.sh

#!/bin/bash
# update all containers
# modified from https://seantemple.com/proxmox/bash/admin/2017/10/01/update-all-containers.html


function update_container() {
  container=$1
  tmux new-window -t $2:$3 -n "$container" -d
  tmux send-keys -t $2:$3 "pct exec $container -- bash -c 'apt update && apt upgrade -y && apt autoremove -y && apt clean' ; tmux wait-for -S $container" Enter
  tmux wait-for $container
  tmux kill-window -t $2:$3
}


function execute() {
  # list of container ids we need to iterate through
  containers=$(pct list | grep running | cut -f1 -d' ')
  script=$1
  #tmux send-keys -t $script:0 "stty -echo ; clear" Enter

  count=1
  for container in $containers
  do
    echo "$container updating..."
    update_container $container $script $count &
    ((count+=1))
  done

  wait
}


script=`basename "$0"`
if [[ $TERM == screen* ]] && [ -n "$TMUX" ]; then
  # If we are in tmux, continue as normal
  execute $script
  tmux kill-session -t $script
else
  # If we are not, run the script in tmux
  # Initialize tmux session
  tmux -2 new-session -s $script $0
fi

echo "Updated all running containers"