Add post about prompt prefix when using ssh

Author: SebastianGrans

.gitignore

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 public/
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content/posts/2025-04-20-hostname-in-prompt/img.png

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+date = '2025-04-20T20:07:49+02:00'
+draft = false
+title = 'Custom Prompt When Connected Over SSH'
+summary = 'To prevent me from deleting the wrong files...'
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+
+I use `zsh` with a theme called `robbyrussell` that makes my prompt very minimalistic. I already
+know who I am, and what machine I'm on, so the standard `user@host` prompt is just noisy.
+
+```bash
+➜  ~ echo "Hello"
+```
+
+I quite like it, except when I SSH to my main machine at work, then it suddenly becomes difficult
+to remember which terminal is which.
+
+Let's prefix my prompt with the hostname, but only if I'm connected over SSH.
+
+## Customizing the prompt
+
+**TL;DR:** Add this snippet to your `~/.zshrc` or `~/.bashrc` (on the remote machine)
+
+```bash
+if [[ -n $SSH_CONNECTION ]] ; then
+    PS1="[$(hostname)] $PS1"
+fi
+```
+
+And your prompt will look like this when you connect to it
+
+```bash
+[some-pc-name] ➜  ~ echo "Hello"
+```
+
+But why stop there? It's always nice with a bit of flair! So I came up with this:
+
+```bash
+if [[ -n $SSH_CONNECTION ]]; then
+    hostname_string="%{$fg_bold[blue]%}[%{$fg_bold[yellow]%}%U$(hostname)%u%{$fg_bold[blue]%}]%{$reset_color%}"
+    PS1="$hostname_string $PS1"
+fi
+```
+
+And how we end up with this when I SSH into my laptop.
+
+![alt text](img.png)
+
+Ant that's good enough for me.
+
+## How does it work?
+
+`SSH_CONNECTION` is an environment variable that is set when you connect via SSH. We're just using
+it as a flag, but it contains the IP of the remote and local machine (see `man ssh`).
+
+`PS1` is another environment variable, the primary prompt string. This string is what defines your
+prompt.
+
+In the first example, I'm simply prepending the existing `PS1` variable with `[$(hostname)]`. In
+the second example, it's a bit more complicated. There `hostname_string` is formatted according to
+the section `EXPANSION OF PROMPT SEQUENCES` in `man zshmisc`.
+
+But we also make use of the variables `fg_bold` and `reset_color`. Which you can read more about
+in `man zshcontrib` under `OTHER FUNCTIONS`.
+
+## Further reading
+
+* `man zshall` - All `zsh` manuals in one big `man` page.
+* `man bash`