SQLite Tables Reference¶
In addition to the tables generated for each log format, lnav includes the following tables:
These extra tables provide useful information and can let you manipulate lnav‘s internal state. You can get a dump of the entire database schema by executing the ‘.schema’ SQL command, like so:
The environ table gives you access to the lnav process’ environment variables. You can SELECT, INSERT, and UPDATE environment variables, like so:
;SELECT * FROM environ WHERE name = 'SHELL' name value SHELL /bin/tcsh ;UPDATE environ SET value = '/bin/sh' WHERE name = 'SHELL'
Environment variables can be used to store simple values or pass values from lnav‘s SQL environment to lnav‘s commands. For example, the “open” command will do variable substitution, so you can insert a variable named “FILENAME” and then open it in lnav by referencing it with “$FILENAME”:
;INSERT INTO environ VALUES ('FILENAME', '/path/to/file') :open $FILENAME
The all_logs table lets you query the format derived from the lnav log message parser that is used to automatically extract data, see Extracting Data for more details.
The http_status_codes table is a handy reference that can be used to turn HTTP status codes into human-readable messages.
The regexp_capture() table-valued function applies the regular expression to the given string and returns detailed results for the captured portions of the string.