The Log File Navigator, lnav for short, is an advanced log file viewer for the small-scale. It is a terminal application that can understand your log files and make it easy for you to find problems with little to no setup. Log messages from different files are collated together into a single view. Automatic detection of log format. Automatic decompression of GZip and BZip2 files. Filter log messages based on regular expressions. Use SQL to analyze your logs.

Even works with systemfail's journals.

Log configurations and scripts for host intrusion detection system. iptables, syslog and psad configs are here because they are becoming hard to otherwise manage. Configs for various systemd units, rsyslog, psad, logrotate, iptables. Tabkey completion files for bash. Manpages. A couple of scripts for managing running settings.

teler is an real-time intrusion detection and threat alert based on web log that runs in a terminal with resources that we collect and provide by the community. Requires minimal configuration. Run your web server logs through it and see what it comes up with.

For collecting GPS track logs suitable for uploading to Open Streetmap, gpsd includes a utility (gpxlogger) which connects to a running gpsd and generates those files. This is a link to its manpage.

A trick for setting a Git alias that prettifies the output of git log in a repository.

git config --global alias.lg "log --color --graph --pretty=format:'%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr) %C(bold blue)<%an>%Creset' --abbrev-commit"