SSH into a remote host and run git pull in the specified repository directory. Supports authentication via private key (PEM string or file path) or password.

SSH into a remote host and run an arbitrary shell command. Returns stdout, stderr and the exit code.

SSH into a remote host and execute a multi-line shell script. The script content is piped to bash remotely; no temporary files are created locally.

Write (or update) a Host entry in the local ~/.ssh/config file. If an entry with the same alias already exists it is replaced. Useful for setting up SSH config before running deployment commands.