Interview Q&A / Linux & Shell
Linux & Shell interview questions
Permissions, processes, pipes and the commands you are expected to know cold.
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- What is a systemd timer, and how does it differ from cron?
A systemd timer is a .timer unit that starts a matching .service on a schedule or after boot. Unlike cron, its output goes to the journal, it can run missed jobs after downtime with Persistent=true, and it supports dependencies and resource limits.
AdvancedQuick answer1 min read - What is SSH local port forwarding, and when is it used?
ssh -L local_port:target_host:target_port user@server opens a port on your machine and tunnels traffic through the SSH server to the target. It lets you reach a service, such as a private database, that is only accessible from the server's network.
AdvancedQuick answer1 min read