Magento 2 – Could Not Open File bin/magento in SSH

the first error seems to say, that the bash can't find php.

edit: like versedi stated in the comments, the first error is raised because you copied the $ sign into the command.

also you just have to run bin/magento setup:upgrade

If you run cd bin first, it it ./magento. The . points to the current directory. Otherwise, it searches for the magento command in your executable paths, which you can see by executing echo $PATH.

Eventually, you have to give it execute permissions first. You can do this by running chmod +x bin/magento

I don't know what have you done after adding some new code but i guess this is the issue cause your new code is not compiled. I am writing some command you should run after adding new code.

Go to the root folder of your Magento project and run the following commands :

sudo rm -rf var/cache var/generation var/di

sudo php bin/magento setup:upgrade

sudo php bin/magento setup:di:compile

sudo php bin/magento cache:clean

sudo chmod 777 -R var/

Hope it will solve your problem.