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.log

Low risk

Log file

Runtime text output from apps and servers. The first place incident responders and admins look when something goes wrong.

MIME types

  • text/plain
  • text/x-log

Category

text

What opens this file

  • tail
  • less
  • lnav
  • VS Code
  • Glogg

How to open by OS

Windows

  • Notepad stalls past a few hundred MB. Glogg or VS Code handle big logs better.

Mac

  • Terminal `tail -f`, lnav.

Linux

  • `less +F`, `journalctl`, lnav.

Ios

  • Koder.

Android

  • Termux for `tail`.

Safety notes

  • Secrets and PII frequently get logged by accident. Review what gets logged before sharing output with vendors or tickets.
  • Missing log rotation burns through disk and eventually takes services down.

Common mistakes

  • Relying on tail -f plus ad-hoc grep for analysis is fine, but sed-based pipelines can accidentally rewrite data if reused on the source.
  • Mixing local time zones makes post-mortem timelines useless — log in UTC.

Related extensions

References