An extremely lightweight logging framework for BASH scripts. Developed and tested on MacOS. This should work on any BASH platform.
It supports four levels, default being INFO.
ERROR > WARN > INFO > DEBUG
Source the tinylogger.bash file, and use the tlog method.
The first argument is the level, and the second the log message.
source tinylogger.bash
tlog warn "This is a warning"
See demo.sh for more.
You can control the logging level while calling a script by setting the LOGGER_LVL argument.
$ LOGGER_LVL=warn ./demo.sh
2017-11-07 19:05:30 - WARN - This is a scary warning
2017-11-07 19:05:30 - ERROR - Something terrible has happened
$ LOGGER_LVL=debug ./demo.sh
2017-11-07 19:05:52 - DEBUG - first line of script
2017-11-07 19:05:52 - INFO - Starting script ./demo.sh
2017-11-07 19:05:52 - DEBUG - another debug statement
2017-11-07 19:05:52 - INFO - Current time is Tue 7 Nov 2017 19:05:52 GMT
2017-11-07 19:05:52 - WARN - This is a scary warning
2017-11-07 19:05:52 - DEBUG - do you like these debug statements?
2017-11-07 19:05:52 - ERROR - Something terrible has happened
2017-11-07 19:05:52 - DEBUG - end of script
2017-11-07 19:05:52 - INFO - Script completed, go home
You can set LOGGER_LVL=none to disable all logging.
Underneath, the date command is used to display the timestamp. Simply set the LOGGER_FMT to any valid format supported by date.
$ LOGGER_LVL=warn LOGGER_FMT=%s ./demo.sh
1510081622 - WARN - This is a scary warning
1510081622 - ERROR - Something terrible has happened
MIT