Put all pdf's you want to combine in a directory. Name them in the order, you want to combine them.

qpdf --empty --pages *.pdf -- NameOfMergedFile.pdf

Easy way to repeat often used commands on the linux console ... add history search backwards to .inputrc in your home directory:

cd ~

vim .inputrc

It's a one liner in your vagrant file:

config.ssh.forward_agent = true

sudo apt purge nodejs npm

curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.33.8/install.sh | bash

exit

Open new terminal

I'm very comfortable with Scotchbox as Vagrantbox for my local development.

I've messed up my nodejs / gulp / browsersync setup at my development notebook.