errors | Package errors implements functions to manipulate errors. |
flag | Package flag implements command-line flag parsing. |
os | Package os provides a platform-independent interface to operating system functionality. |
os/exec | Package exec runs external commands. |
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. |
testing | Package testing provides support for automated testing of Go packages. |