| flag | Package flag implements command-line flag parsing. |
| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| github.com/coreos/etcd/pkg/netutil | Package netutil implements network-related utility functions. |
| github.com/coreos/etcd/tools/functional-tester/etcd-agent/client | |
| log | Package log implements a simple logging package. |
| net | Package net provides a portable interface for network I/O, including TCP/IP, UDP, domain name resolution, and Unix domain sockets. |
| net/http | Package http provides HTTP client and server implementations. |
| net/rpc | Package rpc provides access to the exported methods of an object across a network or other I/O connection. |
| os | Package os provides a platform-independent interface to operating system functionality. |
| os/exec | Package exec runs external commands. |
| path | Package path implements utility routines for manipulating slash-separated paths. |
| time | Package time provides functionality for measuring and displaying time. |