flag | Package flag implements command-line flag parsing. |
fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
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. |
os | Package os provides a platform-independent interface to operating system functionality. |
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 | Package sync provides basic synchronization primitives such as mutual exclusion locks. |
syscall | Package syscall contains an interface to the low-level operating system primitives. |