docs/linux/dev-tip-console-output-to-clipboard.md

Author: sl5net

docs/linux/dev-tip-console-output-to-clipboard.md

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+# Dev Tip: Automatically Copy Console Output to Clipboard
+
+**Category:** Linux / Shell Productivity  
+**Platform:** Linux (zsh + Konsole/KDE)
+
+---
+
+## The Problem
+
+When working with AI assistants, you often need to copy terminal output and paste it into the chat. This usually means:
+1. Run command
+2. Select output with mouse
+3. Copy
+4. Switch to browser
+5. Paste
+
+That's too many steps.
+
+---
+
+## The Solution: Auto-capture via `preexec` / `precmd`
+
+Add this to your `~/.zshrc`:
+
+```bash
+# === AUTO-OUTPUT LOGGER ===
+# Automatically saves console output to ~/t.txt and copies to clipboard.
+# Toggle: set AUTO_CLIPBOARD=true/false
+AUTO_CLIPBOARD=true
+
+preexec() {
+    # Redirect stdout+stderr to ~/t.txt before each command
+    exec > >(tee ~/t.txt) 2>&1
+}
+
+precmd() {
+    # Restore stdout after command finishes
+    exec >/dev/tty 2>&1
+    if [ "$AUTO_CLIPBOARD" = "true" ] && [ -s ~/t.txt ]; then
+        # Filter out ANSI escape codes and KDE Konsole title sequences
+        cat ~/t.txt | sed 's/\][0-9]*;[^]]*\][0-9]*;//g; s/^[0-9]*;//g' \
+            | xclip -selection clipboard
+        echo "[📋 In Zwischenablage kopiert]"
+    fi
+}
+```
+
+Then reload:
+```bash
+source ~/.zshrc
+```
+
+### Result
+
+After every command, the output is automatically in your clipboard — ready to paste into your AI chat with **Ctrl+V**.
+
+The output is also always saved in `~/t.txt` for reference.
+
+---
+
+## How it works
+
+| Part | What it does |
+|------|-------------|
+| `preexec()` | Runs before each command, redirects output to `~/t.txt` |
+| `precmd()` | Runs after each command, restores stdout and copies to clipboard |
+| `tee ~/t.txt` | Saves output to file while still showing it in terminal |
+| `sed '...'` | Strips KDE Konsole title escape sequences (`]2;...`  `]1;`) |
+| `xclip` | Copies cleaned output to clipboard |
+
+---
+
+## Requirements
+
+```bash
+# Install xclip if not present
+sudo pacman -S xclip       # Manjaro/Arch
+sudo apt install xclip     # Ubuntu/Debian
+```
+
+---
+
+## ⚠️ What NOT to do
+
+Do **not** use `fc -ln -1 | bash` to re-execute the last command:
+
+```bash
+# ❌ DANGEROUS - do not use!
+precmd() {
+    output=$(fc -ln -1 | bash 2>&1)  # Re-executes last command!
+    echo "$output" | xclip -selection clipboard
+}
+```
+
+This re-executes every command after it finishes, which can cause destructive side effects — for example overwriting files, re-running `git commit`, re-running `sed -i`, etc.
+
+The `preexec`/`precmd` approach above captures output **during** execution — safe and reliable.