Apologies, the correct command is
```bash
cat /home/root/cat.png | base64
```
This uses the `cat` unix tool, short for "catenate," which outputs the contents of the files following it. The `|` "pipe" operator takes the output of the command preceding it (in this case, the `cat` command) and uses it as input to the command following it (in this case, the `base64` command). The `base64` command takes binary input and encodes it with base64.

Alternatively, `base64` can be used directly with a file argument:
```bash
base64 /home/root/cat.png
```
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