bytes | Package bytes implements functions for the manipulation of byte slices. |
fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
io/ioutil | Package ioutil implements some I/O utility functions. |
os | Package os provides a platform-independent interface to operating system functionality. |
runtime | Package runtime contains operations that interact with Go's runtime system, such as functions to control goroutines. |
sort | Package sort provides primitives for sorting slices and user-defined collections. |
time | Package time provides functionality for measuring and displaying time. |