doc: update usages README.md

README.md

@@ -10,25 +10,54 @@ into a directory in order to comply with license terms on redistribution.
 ## Installation
 
 To download and install this tool, make sure
-[you have Go v1.13 or later installed](https://golang.org/dl/), then run the
+[you have Go v1.16 or later installed](https://golang.org/dl/), then run the
 following command:
 
 ```shell
-$ go get github.com/google/go-licenses
+go get github.com/google/go-licenses
+```
+
+For Go v1.17 or later, [go get is deprecated for installing binaries](https://go.dev/doc/go-get-install-deprecation).
+Use the following command instead to download and install this tool:
+
+```shell
+go install github.com/google/go-licenses@latest
+```
+
+Change directory to your go project, for example:
+
+```shell
+git clone git@github.com:google/go-licenses.git
+cd go-licenses
 ```
 
 ## Reports
 
 ```shell
-$ go-licenses csv "github.com/google/trillian/server/trillian_log_server"
-google.golang.org/grpc,https://github.com/grpc/grpc-go/blob/master/LICENSE,Apache-2.0
-go.opencensus.io,https://github.com/census-instrumentation/opencensus-go/blob/master/LICENSE,Apache-2.0
-github.com/google/certificate-transparency-go,https://github.com/google/certificate-transparency-go/blob/master/LICENSE,Apache-2.0
-github.com/jmespath/go-jmespath,https://github.com/aws/aws-sdk-go/blob/master/vendor/github.com/jmespath/go-jmespath/LICENSE,Apache-2.0
-golang.org/x/text,https://go.googlesource.com/text/+/refs/heads/master/LICENSE,BSD-3-Clause
-golang.org/x/sync/semaphore,https://go.googlesource.com/sync/+/refs/heads/master/LICENSE,BSD-3-Clause
-github.com/prometheus/client_model/go,https://github.com/prometheus/client_model/blob/master/LICENSE,Apache-2.0
-github.com/beorn7/perks/quantile,https://github.com/beorn7/perks/blob/master/LICENSE,MIT
+$ go-licenses csv github.com/google/go-licenses
+github.com/golang/glog,https://github.com/golang/glog/blob/master/LICENSE,Apache-2.0
+github.com/google/licenseclassifier/stringclassifier,https://github.com/google/licenseclassifier/blob/master/stringclassifier/LICENSE,Apache-2.0
+gopkg.in/warnings.v0,Unknown,BSD-2-Clause
+github.com/emirpasic/gods,https://github.com/emirpasic/gods/blob/master/LICENSE,BSD-2-Clause
+github.com/mitchellh/go-homedir,https://github.com/mitchellh/go-homedir/blob/master/LICENSE,MIT
+github.com/google/licenseclassifier,https://github.com/google/licenseclassifier/blob/master/LICENSE,Apache-2.0
+github.com/sergi/go-diff/diffmatchpatch,https://github.com/sergi/go-diff/blob/master/diffmatchpatch/LICENSE,MIT
+golang.org/x/mod/semver,Unknown,BSD-3-Clause
+golang.org/x/crypto,Unknown,BSD-3-Clause
+golang.org/x/net,Unknown,BSD-3-Clause
+github.com/kevinburke/ssh_config,https://github.com/kevinburke/ssh_config/blob/master/LICENSE,MIT
+github.com/spf13/cobra,https://github.com/spf13/cobra/blob/master/LICENSE.txt,Apache-2.0
+github.com/google/go-licenses,Unknown,Apache-2.0
+golang.org/x/tools,Unknown,BSD-3-Clause
+golang.org/x/sys,Unknown,BSD-3-Clause
+golang.org/x/xerrors,Unknown,BSD-3-Clause
+gopkg.in/src-d/go-git.v4,Unknown,Apache-2.0
+gopkg.in/src-d/go-billy.v4,Unknown,Apache-2.0
+github.com/jbenet/go-context/io,https://github.com/jbenet/go-context/blob/master/io/LICENSE,MIT
+github.com/xanzy/ssh-agent,https://github.com/xanzy/ssh-agent/blob/master/LICENSE,Apache-2.0
+github.com/src-d/gcfg,https://github.com/src-d/gcfg/blob/master/LICENSE,BSD-3-Clause
+github.com/otiai10/copy,https://github.com/otiai10/copy/blob/master/LICENSE,MIT
+github.com/spf13/pflag,https://github.com/spf13/pflag/blob/master/LICENSE,BSD-3-Clause
 ```
 
 This command prints out a comma-separated report (CSV) listing the libraries
@@ -42,7 +71,7 @@ URLs may not be available if the library is not checked out as a Git repository
 ## Complying with license terms
 
 ```shell
-$ go-licenses save "github.com/google/trillian/server/trillian_log_server" --save_path="/tmp/trillian_log_server"
+$ go-licenses save "github.com/google/go-licenses" --save_path="/tmp/go-licenses-cli"
 ```
 
 This command analyzes a binary/package's dependencies and determines what needs
@@ -64,6 +93,34 @@ considered forbidden by the license classifer. See
 
 for licenses considered forbidden.
 
+## Usages
+
+Report usage:
+
+```shell
+go-licenses csv <package>
+```
+
+Complying with license terms usage:
+
+```shell
+go-licenses save <package> --save_path=<save_path>
+```
+
+Checking for forbidden licenses usage:
+
+```shell
+go-licenses check <package>
+```
+
+go-licenses expects the same package argument format as `go build`. For example,
+it can be:
+
+* A rooted import path like `github.com/google/go-licenses`.
+* A relative path that denotes the package in that directory, like `.` or `./cmd/some-command`.
+
+To learn more, run `go help packages`.
+
 ## Build tags
 
 To read dependencies from packages with