初心者のGo言語 リファレンス

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[2023年10月18日 更新]

fmtパッケージ

• func Append(b byte, a ...any) byte
• func Appendf(b byte, format string, a ...any) byte
• func Appendln(b byte, a ...any) byte
• func Errorf(format string, a ...any) error
• func FormatString(state State, verb rune) string
• func Fprint(w io.Writer, a ...any) (n int, err error)
• func Fprintf(w io.Writer, format string, a ...any) (n int, err error)
• func Fprintln(w io.Writer, a ...any) (n int, err error)
• func Fscan(r io.Reader, a ...any) (n int, err error)
• func Fscanf(r io.Reader, format string, a ...any) (n int, err error)
• func Fscanln(r io.Reader, a ...any) (n int, err error)
• func Print(a ...any) (n int, err error)
• func Printf(format string, a ...any) (n int, err error)
• func Println(a ...any) (n int, err error)
• func Scan(a ...any) (n int, err error)
• func Scanf(format string, a ...any) (n int, err error)
• func Scanln(a ...any) (n int, err error)
• func Sprint(a ...any) string
• func Sprintf(format string, a ...any) string
• func Sprintln(a ...any) string
• func Sscan(str string, a ...any) (n int, err error)
• func Sscanf(str string, format string, a ...any) (n int, err error)
• func Sscanln(str string, a ...any) (n int, err error)

osパッケージ

• func Chdir(dir string) error
• func Chmod(name string, mode FileMode) error
• func Chown(name string, uid, gid int) error
• func Chtimes(name string, atime time.Time, mtime time.Time) error
• func Clearenv()
• func DirFS(dir string) fs.FS
• func Environ() string
• func Executable() (string, error)
• func Exit(code int)
• func Expand(s string, mapping func(string) string) string
• func ExpandEnv(s string) string
• func Getegid() int
• func Getenv(key string) string
• func Geteuid() int
• func Getgid() int
• func Getgroups() (int, error)
• func Getpagesize() int
• func Getpid() int
• func Getppid() int
• func Getuid() int
• func Getwd() (dir string, err error)
• func Hostname() (name string, err error)
• func IsExist(err error) bool
• func IsNotExist(err error) bool
• func IsPathSeparator(c uint8) bool
• func IsPermission(err error) bool
• func IsTimeout(err error) bool
• func Lchown(name string, uid, gid int) error
• func Link(oldname, newname string) error
• func LookupEnv(key string) (string, bool)
• func Mkdir(name string, perm FileMode) error
• func MkdirAll(path string, perm FileMode) error
• func MkdirTemp(dir, pattern string) (string, error)
• func NewSyscallError(syscall string, err error) error
• func Pipe() (r * File, w * File, err error)
• func ReadFile(name string) (byte, error)
• func Readlink(name string) (string, error)
• func Remove(name string) error
• func RemoveAll(path string) error
• func Rename(oldpath, newpath string) error
• func SameFile(fi1, fi2 FileInfo) bool
• func Setenv(key, value string) error
• func Symlink(oldname, newname string) error
• func TempDir() string
• func Truncate(name string, size int64) error
• func Unsetenv(key string) error
• func UserCacheDir() (string, error)
• func UserConfigDir() (string, error)
• func UserHomeDir() (string, error)
• func WriteFile(name string, data byte, perm FileMode) error

os/execパッケージ

• func LookPath(file string) (string, error)
• func Command(name string, arg ...string) *Cmd
• func CommandContext(ctx context.Context, name string, arg ...string) *Cmd
• func (c *Cmd) CombinedOutput() (byte, error)
• func (c *Cmd) Environ() string
• func (c *Cmd) Output() (byte, error)
• func (c *Cmd) Run() error
• func (c *Cmd) Start() error
• func (c *Cmd) StderrPipe() (io.ReadCloser, error)
• func (c *Cmd) StdinPipe() (io.WriteCloser, error)
• func (c *Cmd) StdoutPipe() (io.ReadCloser, error)
• func (c *Cmd) String() string
• func (c *Cmd) Wait() error
• func (e *Error) Error() string
• func (e *Error) Unwrap() error
• func (e *ExitError) Error() string

os/signalパッケージ

• func Ignore(sig ...os.Signal)
• func Ignored(sig os.Signal) bool
• func Notify(c chan<- os.Signal, sig ...os.Signal)
• func NotifyContext(parent context.Context, signals ...os.Signal) (ctx context.Context, stop context.CancelFunc)
• func Reset(sig ...os.Signal)
• func Stop(c chan<- os.Signal)

os/userパッケージ

• func LookupGroup(name string) (*Group, error)
• func LookupGroupId(gid string) (*Group, error)
• func Current() (*User, error)
• func Lookup(username string) (*User, error)
• func LookupId(uid string) (*User, error)
• func (u *User) GroupIds() (string, error)

pathパッケージ

• func Base(path string) string
• func Clean(path string) string
• func Dir(path string) string
• func Ext(path string) string
• func IsAbs(path string) bool
• func Join(elem ...string) string
• func Match(pattern, name string) (matched bool, err error)
• func Split(path string) (dir, file string)

path/filepath

• func Abs(path string) (string, error)
• func Base(path string) string
• func Clean(path string) string
• func Dir(path string) string
• func EvalSymlinks(path string) (string, error)
• func Ext(path string) string
• func FromSlash(path string) string
• func Glob(pattern string) (matches string, err error)
• func HasPrefix(p, prefix string) boolDEPRECATED
• func IsAbs(path string) bool
• func IsLocal(path string) bool
• func Join(elem ...string) string
• func Match(pattern, name string) (matched bool, err error)
• func Rel(basepath, targpath string) (string, error)
• func Split(path string) (dir, file string)
• func SplitList(path string) string
• func ToSlash(path string) string
• func VolumeName(path string) string
• func Walk(root string, fn WalkFunc) error
• func WalkDir(root string, fn fs.WalkDirFunc) error
• type WalkFunc func(path string, info fs.FileInfo, err error) error

応用プログラム

• 総和計算<fmtパッケージ>
• パーミッション(権限)の8進数文字列指定<osパッケージ>
• フォルダのパーミッション(権限)<osパッケージ>