diff --git a/internal/pkg/dir.go b/internal/pkg/dir.go
new file mode 100644
index 0000000..a9a639d
--- /dev/null
+++ b/internal/pkg/dir.go
@@ -0,0 +1,124 @@
+package pkg
+
+import (
+	"crypto/rand"
+	"fmt"
+	"os"
+	"path/filepath"
+	"time"
+)
+
+type Dir struct {
+	Path           string
+	PathCurrentDir string
+	PathBackupDir  string
+}
+
+// NewDir creates a new Dir instance.
+func NewDir(dir, nameCurrentDir string) *Dir {
+	return &Dir{
+		Path:           dir,
+		PathCurrentDir: filepath.Join(dir, nameCurrentDir),
+		PathBackupDir:  filepath.Join(dir, nameCurrentDir+".bak"),
+	}
+}
+
+// CreateRandomTmpDir creates a temporary directory in the specified directory with a random name.
+// The directory is created with permissions 0750.
+// If the directory already exists, an error is returned.
+// @return string - path to the temporary directory
+// @return error - an error if the directory could not be created
+func (d *Dir) CreateRandomTmpDir() (string, error) {
+	tmpDir := filepath.Join(d.Path, time.Now().Format(time.RFC3339)+"_"+rand.Text()+".tmp")
+	if _, err := os.Stat(tmpDir); err == nil {
+		return "", fmt.Errorf("directory already exists: %s", tmpDir)
+	}
+	if err := os.MkdirAll(tmpDir, 0750); err != nil {
+		return "", err
+	}
+	return tmpDir, nil
+}
+
+// ReplaceDirToCurrent replaces the current directory with a new directory.
+// If the new directory already exists, it is renamed to a backup directory.
+// If the backup directory already exists, it is removed.
+// @return error - an error if the directory could not be replaced
+func (d *Dir) ReplaceDirToCurrent(newDir string) error {
+	if err := os.RemoveAll(d.PathBackupDir); err != nil {
+		return err
+	}
+
+	if _, err := os.Stat(d.PathCurrentDir); err == nil {
+		if err := os.Rename(d.PathCurrentDir, d.PathBackupDir); err != nil {
+			return err
+		}
+	}
+
+	if err := os.Rename(newDir, d.PathCurrentDir); err != nil {
+		if _, statErr := os.Stat(d.PathBackupDir); statErr == nil {
+			_ = os.Rename(d.PathBackupDir, d.PathCurrentDir)
+		}
+		return err
+	}
+
+	if err := os.RemoveAll(d.PathBackupDir); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// MovingFiles moves all files from dirFrom to dirTo.
+// If dirTo does not exist, it is created.
+// @param dirFrom - path to the directory containing the files to move
+// @param dirTo - path to the directory where the files will be moved
+// @return error - an error if the files could not be moved
+func MovingFiles(dirFrom, dirTo string) error {
+	if _, err := os.Stat(dirTo); err != nil {
+		if err := os.MkdirAll(dirTo, 0750); err != nil {
+			return err
+		}
+	}
+
+	entries, err := os.ReadDir(dirFrom)
+	if err != nil {
+		return err
+	}
+
+	for _, entry := range entries {
+		if entry.IsDir() {
+			if err := MovingFiles(filepath.Join(dirFrom, entry.Name()), dirTo); err != nil {
+				return err
+			}
+			continue
+		}
+		src := filepath.Join(dirFrom, entry.Name())
+		dst := filepath.Join(dirTo, entry.Name())
+		if err := os.Rename(src, dst); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// FindMMDBFile finds the .mmdb file in the specified directory.
+// @param dir - path to the directory to search
+// @return string - path to the .mmdb file
+// @return error - an error if the .mmdb file could not be found
+func FindMMDBFile(dir string) (string, error) {
+	entries, err := os.ReadDir(dir)
+	if err != nil {
+		return "", err
+	}
+	for _, entry := range entries {
+		if entry.IsDir() {
+			continue
+		}
+		if filepath.Ext(entry.Name()) == ".mmdb" {
+			return filepath.Join(dir, entry.Name()), nil
+		}
+	}
+
+	return "", fmt.Errorf("no .mmdb file found in %s", dir)
+}