Use command Substitution, redirection, piping, SSH Configuration and terminal multiplexers to execute commands without a new shell.
There are several ways to execute commands on a remote system via Secure Shell (SSH) without opening a new shell, each offering different benefits:
1. Command Substitution:
This method embeds the desired command within an SSH command using backticks (command) or dollar sign parentheses ($("command")). This allows for seamlessly integrating remote command output into local shell scripts.
2. Redirection:
Redirecting the output of a remote command directly to a file on the remote system allows for capturing results without needing a new shell. This is particularly useful for long-running commands or generating logs.
3. Piping:
Piping the output of a remote command to another command on the remote system allows for immediate processing of the output data. This can be useful for filtering, manipulating, or chaining commands for complex tasks.
4. SSH Configuration:
Advanced users can configure their SSH keys to specify commands to run upon connection. This allows for automating specific tasks upon establishing an SSH session.
5. Terminal Multiplexers:
Tools like Screen or Tmux allow for creating persistent remote sessions that can be detached and reattached later. This enables running commands in the background without maintaining an active SSH connection.