Install:

  go get github.com/tscolari/lag

Usage:

  lag logfile.log

Navigation:

• Q exits
• arrow up/down moves cursor up/down
• k/j moves cursor up/down (vim)
• page up/down moves page up/down
• enter zooms into the selected entry
• l zooms into the selected entry (vim)
• q zooms out from the selected entry
• h zooms out from the selected entry (vim)
• backspace zooms out from the selected entry
• e filters for errored logs only (q to zoom out)
• D filters out similar log entries (those that the message matches exactly the one under the cursor)
• i toggle current selected entry's session information popup

Demo