majiayu000 record - Terminal Recording
Overview
The record command creates asciinema terminal recordings for documentation purposes. It records a command execution with automatic title and metadata injection, producing .cast files compatible with asciinema players.
Key Concept: Records are non-interactive - you specify the command to run and it captures the output. The recording fails if the command fails (exit code != 0).
Quick Reference
| Parameter | Long Flag | Short | Required | Description |
|---|---|---|---|---|
| File | --file |
-f |
Yes | Output .cast file path |
| Command | --command |
-c |
Yes | Command to record |
| Title | --title |
-t |
No | Recording title (defaults to filename) |
Usage
# Basic recording
ujust record -f OUTPUT.cast -c "COMMAND"
# With title
ujust record -f OUTPUT.cast -t "TITLE" -c "COMMAND"
# Long form
ujust record --file=OUTPUT.cast --title="TITLE" --command="COMMAND"
Examples
Record a Simple Command
ujust record -f docs/recordings/hello.cast -c "echo Hello World"
Record a ujust Command
ujust record -f docs/recordings/ollama-start.cast -t "Starting Ollama" -c "ujust ollama start"
Record Multiple Commands
# Use quoted string with && or ;
ujust record -f docs/recordings/setup.cast -c "ujust ollama config && ujust ollama start"
Record to Specific Directory
# Creates directory if needed
ujust record -f /tmp/demos/test.cast -c "ls -la"
Output Format
The command produces asciinema v3 format .cast files:
- Header: JSON with title, timestamp, and injected command metadata
- Events: Timestamped terminal output events
- Compatible with: asciinema player, asciinema-agg (GIF), svg-term
Example Header
{"version":3,"width":80,"height":24,"title":"Starting Ollama","command":"ujust ollama start"}
Requirements
The following tools must be available:
| Tool | Purpose |
|---|---|
asciinema |
Terminal recording |
jq |
Metadata injection |
Both are pre-installed in Bazzite AI.
Behavior
- Validates required parameters (
--fileand--command) - Creates output directory if needed
- Creates temp script with the command
- Records execution with asciinema
- Injects command metadata into .cast header
- Fails and removes output if command exits non-zero
Exit Codes
| Code | Meaning |
|---|---|
| 0 | Recording successful |
| 1 | Missing parameters, asciinema error, or jq error |
| N | Command exit code (recording removed on failure) |
Common Workflows
Documentation Recording
# Record feature demonstration
ujust record -f docs/recordings/feature-demo.cast -t "Feature Demo" -c "ujust feature-name"
# Verify recording
asciinema play docs/recordings/feature-demo.cast
Convert to GIF
# Using asciinema-agg (separate tool)
agg docs/recordings/demo.cast docs/images/demo.gif
# Or using svg-term
svg-term --in docs/recordings/demo.cast --out docs/images/demo.svg
Troubleshooting
"asciinema not installed"
Asciinema should be pre-installed. If missing:
flatpak install flathub org.asciinema.asciinema
"Recording failed - command exited with code N"
The recorded command failed. Fix the command first, then re-record:
# Test command manually
ujust ollama start
# Then record
ujust record -f output.cast -c "ujust ollama start"
Recording is Empty or Truncated
Ensure the command produces output. Silent commands may appear empty:
# Add echo for visibility
ujust record -f output.cast -c "echo 'Starting...' && silent-command"
Cross-References
- Related: Documentation workflows, demo creation
- asciinema docs: https://asciinema.org/docs
When to Use This Skill
Use when the user asks about:
- "record terminal", "terminal recording", "asciinema"
- "create demo", "record command", "capture terminal"
- "documentation recording", "tutorial recording"
- ".cast file", "terminal GIF"