free: apply conventions (#1733)

coverage
Starbeamrainbowlabs 2017-12-03 09:36:56 +00:00 committed by GitHub
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- Display memory in Bytes/KB/MB/GB: - Display memory in Bytes/KB/MB/GB:
`free {{-b/-k/-m/-g}}` `free -{{b|k|m|g}}`
- Display memory in human readable units: - Display memory in human readable units:
`free -h` `free -h`
- Continuous monitor memory (refresh every X seconds): - Refresh the output every 2 seconds:
`free -s {{X}}` `free -s {{2}}`