# Useful commands on Linux 🐧

The following page contains just random useful Linux cli commands I often use and want to keep somewhere to copy and paste. Mostly useful to myself.

## Systemd resolvd debugging

Show configuration including used resolvers
```bash
resolvectl status
```

Flush local DNS caches
```bash
resolvectl flush-caches
```


## Connections and ports with ss

List all listening UDP oder TCP sockets including the PID

```bash
ss -tulpe
```

List all TCP connections to a certain port

```bash
ss -t 'dport = :<port>
```

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