Log File Navigator

Charly's Column – lnav

Article from Issue 223/2019
Author(s):

During a long trek through the verbose syslog, really important warnings and errors are scattered along the path. Sometimes a missing message can be the decisive event. Sys admin columnist Charly has now hired a tracker to help him search for clues: Log File Navigator.

Searching in logfiles is the sys admin's bread and butter. Finding a specific piece of information often requires long cascades of grep commands. What makes this even more difficult is if a log message that I expect every five minutes is delayed. Of course, this is a warning signal, but I can't use grep to figure this out. What can draw my attention to the fact that warning messages are piling up? These difficulties prompted me to onboard Log File Navigator (lnav, [1] ).

If you launch lnav without any options, it opens /var/log/syslog (Figure 1). Using:

lnav /var/log/syslog*

[...]

Use Express-Checkout link below to read the full article (PDF).

Buy this article as PDF

Express-Checkout as PDF
Price $2.95
(incl. VAT)

Buy Linux Magazine

SINGLE ISSUES
 
SUBSCRIPTIONS
 
TABLET & SMARTPHONE APPS
Get it on Google Play

US / Canada

Get it on Google Play

UK / Australia

Related content

  • Tool Tips

    Six Linux tools reviewed: FISH 2.0.0, BAD 0.0.2, BLINK, FPING 3.5, LNAV 0.5.0, TOMB 1.4

  • Tempus Fugit

    Charly Kühnast, sys admin columnist for 15 years, is searching for lost microseconds.

  • Charly's Column

    Using SQL to sift syslog data out of a database is an admittedly universal, but also fairly convoluted approach. phpLogCon, with its web interface, gives admins an easier option.

  • Glogg

    Programmers and Linux administrators appreciate the benefits of event logs. The Glogg tool is the perfect choice for searching even large logfiles.

  • Charly's Column: Terminator

    Friends are all about friendship – names and appearances typically don’t play any role at all. Sys admin Charly’s friend the Terminator is a convincing example.

comments powered by Disqus

Direct Download

Read full article as PDF:

Price $2.95

News