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In afx, it provides debugging feature by default. You can specify environment variables like:

$ export AFX_LOG=debug
$ afx <sub-command>

It always shows debug messages while running afx, so it's ok to specify only oneline:

$ AFX_LOG=debug afx ...

Currently log levels we can use are here:

Level Message
INFO Only show info message
WARN Previous level, plus warn message
ERROR Previous level, plus error message
DEBUG Previous level, plug more detail log messages
TRACE Previous level, plus all of log messages