Build example:
- $~:
[GOOS=linux] [GOARCH=amd64] go build [-o <out_file_name>] <in_src_file>.go - $~:
[GOOS=darwin] [GOARCH=amd64] go build [-o <out_file_name>] <in_src_file>.go - $~:
[GOOS=windows] [GOARCH=amd64] go build [-o <out_file_name>.exe] <in_src_file>.go