logana 0.4.0

A TUI log analyzer/viewer built for speed - handles files with millions of lines with instant filtering and VIM like navigation.
Documentation

logana

A fast terminal log viewer for files of any size — including multi-GB logs. Built on memory-mapped I/O and SIMD line indexing. Auto-detects log formats, filters by pattern, regex, field value, or date range — bookmark lines, add annotations, and export your analysis.

Features

  • Auto-detected log formats — JSON, syslog, journalctl, logfmt, OpenTelemetry, DLT (AUTOSAR), and more
  • Filtering — include/exclude patterns (literal or regex), date-range filters, field-scoped filters; add filters from the command line with -i/-o/-t
  • Persistent sessions — filters, scroll position, marks, and annotations survive across runs; configurable restore policy (ask / always / never)
  • Structured field view — parsed timestamps, levels, targets, and extra fields displayed in columns; select which columns you want visible
  • Vim-style navigation — j/k, gg/G, Ctrl+d/u, count prefixes (5j, 10G), / search, e/w error/warning jumps
  • Annotations — attach comments to log lines; export analysis to Markdown or Jira
  • Value coloring — HTTP methods, status codes, IP addresses, and UUIDs colored automatically
  • OTel collector — receive OpenTelemetry logs in real time over gRPC or HTTP/JSON; compatible with any OTel SDK
  • Multi-tab — open multiple files, Docker streams, DLT daemon connections, or OTel collector tabs; each tab has independent filters and session state
  • MCP server — embedded Model Context Protocol server; expose marks and annotations to AI assistants
  • Headless mode — run the full filter pipeline without a TUI to preprocess huge logs
  • Fully configurable — all keybindings remappable via ~/.config/logana/config.json; 22 bundled themes

Installation

Pre-built binaries (recommended)

Download from the Releases page, or use the install script:

Linux / macOS

curl -fsSL https://github.com/pauloremoli/logana/releases/latest/download/install.sh | sh

Windows (PowerShell)

irm https://github.com/pauloremoli/logana/releases/latest/download/install.ps1 | iex

Homebrew (macOS / Linux)

brew tap pauloremoli/logana
brew install logana

Cargo

cargo install logana

Quick Start

# Open a file
logana app.log

# Open a directory (each file opens in its own tab)
logana /var/log/

# Pipe from stdin
journalctl -f | logana

# Start at the end and follow new lines
logana app.log --tail

# Stream a Docker container
logana            # then type :docker

# Receive OpenTelemetry logs over gRPC (port 4317)
logana            # then type :otel

# Add inline filters on the command line
logana app.log -i error -o debug
logana app.log -i "--field level=ERROR" -t "> 2024-02-21"

# Headless — filter without the TUI, output to stdout or a file
logana app.log --headless -i error -o debug
logana app.log --headless -i error --output filtered.log

Documentation

Full documentation is at pauloremoli.github.io/logana.