![这个 Phusion 包装器脚本在做什么?](https://linux22.com/image/532215/%E8%BF%99%E4%B8%AA%20Phusion%20%E5%8C%85%E8%A3%85%E5%99%A8%E8%84%9A%E6%9C%AC%E5%9C%A8%E5%81%9A%E4%BB%80%E4%B9%88%EF%BC%9F.png)
if [[ -s "/usr/local/rvm/environments/ree-1.8.7-2010.02" ]] ; then
source "/usr/local/rvm/environments/ree-1.8.7-2010.02"
exec ruby "$@"
else
echo "ERROR: Missing RVM environment file: '/usr/local/rvm/environments/ree-1.8.7-2010.02'" >&2
exit 1
fi
“ ” 起什么-s
作用?
那么“ ”在做什么>&2
?