Answers for "ssh add Could not open a connection to your authentication agent"

could not open a connection to your authentication agent

eval `ssh-agent -s`
ssh-add

ssh-add could not open a connection to your authentication agent centos

##1
$ cd ~/.ssh
##2
#ubuntu
$ eval $(ssh-agent)
#CentOS
$ exec ssh-agent bash
##3
$ ssh-add my_id_rsa

ssh-add could not open a connection to your authentication agent

# wsl2 solution with vscode to connect to Github repository (not sure why it works with the agent but not otherwise keys are in Ubuntu ie. could be with it being in a VM)
eval $(ssh-agent)
ssh-add

Could not open a connection to your authentication agent.

$ eval `ssh-agent -s`