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$ ais log get --help
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NAME:
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   ais log get - Download logs from a selected node or the entire cluster;
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                 supports downloading current logs or TAR.GZ archives.
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   e.g.:
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     - 'ais log get NODE_ID /tmp'                    - download the current log from NODE_ID and save it in the specified directory;
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     - 'ais log get NODE_ID /tmp/out' --refresh 10   - download the current log from NODE_ID as /tmp/out
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                                                       and continuously update it every 10 seconds;
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     - 'ais log get cluster /tmp'                    - download TAR.GZ archives from all cluster nodes
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                                                       and save them in the specified directory ('get cluster' implies '--all');
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     - 'ais log get NODE_ID --all'                   - download the complete log archive (TAR.GZ) from NODE_ID;
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     - 'ais log get NODE_ID --all --severity error'  - download only errors and warnings from NODE_ID;
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     - 'ais log get NODE_ID --all --severity e'      - same as above.
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USAGE:
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   ais log get NODE_ID [OUT_FILE|OUT_DIR|-] [command options]
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OPTIONS:
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   --refresh value   interval for continuous monitoring;
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                     valid time units: ns, us (or µs), ms, s (default), m, h
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   --count value     used together with '--refresh' to limit the number of generated reports, e.g.:
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                      '--refresh 10 --count 5' - run 5 times with 10s interval (default: 0)
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   --severity value  log severity is either 'info' (default) or 'error', whereby error logs contain both errors and warnings, e.g.:
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                     - 'ais show log NODE_ID'
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                     - 'ais log show NODE_ID --severity i' - same as above
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                     - 'ais show log NODE_ID --severity error' - errors and warnings only
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                     - 'ais show log NODE_ID --severity w' - same as above
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   --yes, -y         assume 'yes' to all questions
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   --all             download all logs
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   --help, -h        show help

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$ ais log show --help
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NAME:
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   ais log show - for a given node: show its current log (use '--refresh' to update, '--help' for details)
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USAGE:
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   ais log show NODE_ID [command options]
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OPTIONS:
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   --refresh value    interval for continuous monitoring;
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                      valid time units: ns, us (or µs), ms, s (default), m, h
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   --count value      used together with '--refresh' to limit the number of generated reports, e.g.:
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                       '--refresh 10 --count 5' - run 5 times with 10s interval (default: 0)
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   --severity value   log severity is either 'info' (default) or 'error', whereby error logs contain both errors and warnings, e.g.:
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                      - 'ais show log NODE_ID'
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                      - 'ais log show NODE_ID --severity i' - same as above
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                      - 'ais show log NODE_ID --severity error' - errors and warnings only
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                      - 'ais show log NODE_ID --severity w' - same as above
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   --log-flush value  can be used in combination with '--refresh' to override configured 'log.flush_time'
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   --help, -h         show help

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$ ais cluster download-logs --help
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NAME:
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   ais cluster download-logs - download log archives from all clustered nodes (one TAR.GZ per node), e.g.:
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               - 'download-logs /tmp/www' - save log archives to /tmp/www directory
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               - 'download-logs --severity w' - errors and warnings to system temporary directory
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                 (see related: 'ais log show', 'ais log get')
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USAGE:
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   ais cluster download-logs [OUT_DIR] [command options]
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OPTIONS:
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   --severity value  log severity is either 'i' or 'info' (default, can be omitted), or 'error', whereby error logs contain
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                     only errors and warnings, e.g.: '--severity info', '--severity error', '--severity e'
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   --help, -h        show help