Powerful log viewers

• lcut, lfmt, lviz from hutils
  • They are commands for manipulating logfmt logs.
  • Logfmt: A Log Format That's Easy To Read and Write | Cloudbees Blog
  • Hutils - Explore your structured log data | Heroku
  • I tried to use lcut, and I found it's nice to narrow down logs.
  • I tried to use lviz, and I found it helpful to take a quick look at logs.
• angle-grinder
  • My understanding: it's jq for any log formats. Filtering and aggregation.
  • I tried to use angle-grinder, and I found it's powerful, but it's hard to learn how to use it.
• lnav
  • My understanding: it's turbocharged less. Automatic colorize, interactive filtering, and even querying log by SQL.
  • I tried to use lnav, and I found it's too powerful, and I had an urge to use the SQL feature.
• VisiData
  • My understanding: it's Microsoft Excel™️ in the terminal. Navigate and analyze logs as like a spreadsheet, sorting and filtering, and even summarizing and aggregating data. Ultimate.
  • Even a tutorial for beginner is written very well.
  • I tried to use VisiData, and I found it's insanely powerful.