The Logfile Navigator is a log file viewer for the terminal. Given a set of files/directories, lnav will:

• decompress as needed;
• detect their format;
• merge the files by time into a single view;
• tail the files, follow renames, find new files in directories;
• build an index of errors and warnings;
• pretty-print JSON-lines.

Then, in the lnav TUI, you can:

• jump quickly to the previous/next error (press e/E);
• search using regular expressions (press /);
• highlight text with a regular expression (:highlight command);
• filter messages using regular expressions or SQLite expressions;
• pretty-print structured text (press P);
• view a histogram of messages over time (press i);
• analyze messages using SQLite (press ;)