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doc: clarify etcdctl default API version

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Jingyi Hu 2019-05-29 14:44:52 -07:00
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etcdctl/README.md
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@ -3,7 +3,9 @@ etcdctl
`etcdctl` is a command line client for [etcd][etcd].
The v3 API is used by default. For the v2 API, make sure to set environment variable `ETCDCTL_API=2`. See also [READMEv2][READMEv2].
The v3 API is used by default on master branch. For the v2 API, make sure to set environment variable `ETCDCTL_API=2`. See also [READMEv2][READMEv2].
If using released versions earlier than v3.4, set `ETCDCTL_API=3` to use v3 API.
Global flags (e.g., `dial-timeout`, `--cacert`, `--cert`, `--key`) can be set with environment variables: