Add an encrypted SSH key with `ssh-add` and get the password from `pass` (passwordstore.org)

ssh-add-with-pass.sh

#!/bin/bash

# Script adapted from
# https://stackoverflow.com/a/13034313
#
# Requirements:
# - "expect" https://linux.die.net/man/1/expect

SSH_KEY_FILE="FULL_PATH_TO_SSH_FILE"              # example: "/Users/alice/.ssh/id_rsa"
PASS_NAME="NAME_OF_FILE_IN_~/.password-store"     # example: "my-ssh-passphrase"

pass=$(pass show "${PASS_NAME}")

expect << EOF
  spawn ssh-add "${SSH_KEY_FILE}"
  expect "Enter passphrase"
  send "$pass\r"
  expect eof
EOF