| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| github.com/Sirupsen/logrus | |
| github.com/pkg/errors | Package errors provides simple error handling primitives. |
| os | Package os provides a platform-independent interface to operating system functionality. |
| os/signal | Package signal implements access to incoming signals. |
| path/filepath | Package filepath implements utility routines for manipulating filename paths in a way compatible with the target operating system-defined file paths. |
| runtime | Package runtime contains operations that interact with Go's runtime system, such as functions to control goroutines. |
| strconv | Package strconv implements conversions to and from string representations of basic data types. |
| strings | Package strings implements simple functions to manipulate UTF-8 encoded strings. |
| sync/atomic | Package atomic provides low-level atomic memory primitives useful for implementing synchronization algorithms. |
| syscall | Package syscall contains an interface to the low-level operating system primitives. |
| time | Package time provides functionality for measuring and displaying time. |