Searching logfiles with tail, grep, and company

DIVE DEEP

Author(s):

If your hardware or software goes on strike, or the graphical system or your Internet connection fail, checking the logfiles can often be a big help. In this month’s column, we will look at the command-line tools that can help you scour the depths of these critical files.

Kernel messages, user logins or log offs, network processes, and many other events are logged meticulously by the Linux system. The Linux system’s logging system goes by the name of syslogd (or syslog-ng, “Syslog New Generation” on SUSE Linux); the system logger is a daemon, which is started at system boot time. All log files are stored in the folder /var/ log/ and its subdirectories .

With just a couple of exceptions, most of these protocol files are protected from prying eyes and only readable by the system administrator. To view the files, you can use KDE’s file manager, Konqueror, for example, in system administration mode. To do so, pop up a quick starter by pressing Alt+F2 and type kdesu konqueror, then type the root password after the prompt.

Read full article as PDF:

086-087_command.pdf  (346.96 kB)

Related content

  • Glogg

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

  • Logfile Viewers

    While users are surfing the web, listening to music, and writing documents, the kernel and various background daemons write information to logfiles. KSystemLog, Gnome System Log Viewer, and MultiTail will help you read and process logfile data.

  • Monitoring Logfiles

    Logfiles contain records of what happens on a Linux system and the services it runs. Tools like Logcheck and Logsurfer filter out the most important events for the administrator, and they can even trigger an appropriate reaction automatically.

  • Command Line: Viewing Files

    If you just want to peek into a text file, Linux has an abundance of commands to satisfy your curiosity.

  • Command Line: File Viewers

    Practical tools such as cat, less, and head are convenient for viewing text.

comments powered by Disqus

Direct Download

Read full article as PDF:

086-087_command.pdf  (346.96 kB)

News

njobs Europe
What:
Where:
Country:
Njobs Netherlands Njobs Deutschland Njobs United Kingdom Njobs Italia Njobs France Njobs Espana Njobs Poland
Njobs Austria Njobs Denmark Njobs Belgium Njobs Czech Republic Njobs Mexico Njobs India Njobs Colombia