Fork spawn/exec new instance of node difference

spawn-nvm-node.sh

#!/usr/bin/env bash

. ~/.nvm/nvm.sh

nvm install 4.6.2 >/dev/null 2>&1
nvm install 6.9.1 >/dev/null 2>&1

echo 'console.log("Forked child: " + process.version)' > to-fork.js

# prints v6.9.1
node -v

# prints v4.6.2
~/.nvm/versions/node/v4.6.2/bin/node -v

# prints v4.6.2
~/.nvm/versions/node/v4.6.2/bin/node -e "require('child_process').fork('to-fork.js')"

echo "Start v4.6.2 node and spawn new instance of node, doesn't matter exec or spawn... Prints v6.9.1 two times."
~/.nvm/versions/node/v4.6.2/bin/node -p -e "require('child_process').execSync('node -v').toString()"
~/.nvm/versions/node/v4.6.2/bin/node -p -e "require('child_process').spawnSync('node',['-v']).stdout.toString()"

rm to-fork.js

# Full output:
# v6.9.1
# v4.6.2
# Forked child: v4.6.2
# Start v4.6.2 node and spawn new instance of node, doesn't matter exec or spawn... Prints v6.9.1 two times.
# v6.9.1

# v6.9.1
#