Everytime my laptop connect to company's wifi, and committing/fetching something, git always pops error permission denied so I have to add the ssh key. The problem is that it doesn't effect permanently, I have to do it again everyday with the following commands:
cd ~/.ssh ssh-add ssh_key After this, everything works fine. Is there anyway to do it once and for all?
You likely need to rename your ssh_key file or specify it in your ssh config.
I believe the default identity files are id_rsa, id_dsa, id_ecdsa, id_ed25519.
Rename your file to one of these and ensure it is in ~/.ssh and I think that will solve the issue.
Alternatively add/edit your ~/.ssh/config file with an appropriate line to use this key. Possibly something like
Host * IdentityFile ~/.ssh/ssh_key 
ssh-addmeans you are usingssh-agent. By design, it is not persistent.