type stringValue … func newStringValue(val string, p *string) *stringValue { … } func (s *stringValue) Set(val string) error { … } func (s *stringValue) Type() string { … } func (s *stringValue) String() string { … } func stringConv(sval string) (interface{ … } // GetString return the string value of a flag with the given name func (f *FlagSet) GetString(name string) (string, error) { … } // StringVar defines a string flag with specified name, default value, and usage string. // The argument p points to a string variable in which to store the value of the flag. func (f *FlagSet) StringVar(p *string, name string, value string, usage string) { … } // StringVarP is like StringVar, but accepts a shorthand letter that can be used after a single dash. func (f *FlagSet) StringVarP(p *string, name, shorthand string, value string, usage string) { … } // StringVar defines a string flag with specified name, default value, and usage string. // The argument p points to a string variable in which to store the value of the flag. func StringVar(p *string, name string, value string, usage string) { … } // StringVarP is like StringVar, but accepts a shorthand letter that can be used after a single dash. func StringVarP(p *string, name, shorthand string, value string, usage string) { … } // String defines a string flag with specified name, default value, and usage string. // The return value is the address of a string variable that stores the value of the flag. func (f *FlagSet) String(name string, value string, usage string) *string { … } // StringP is like String, but accepts a shorthand letter that can be used after a single dash. func (f *FlagSet) StringP(name, shorthand string, value string, usage string) *string { … } // String defines a string flag with specified name, default value, and usage string. // The return value is the address of a string variable that stores the value of the flag. func String(name string, value string, usage string) *string { … } // StringP is like String, but accepts a shorthand letter that can be used after a single dash. func StringP(name, shorthand string, value string, usage string) *string { … }