diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5543093e..19674d92 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,7 @@ Check [Keep a Changelog](http://keepachangelog.com/) for recommendations on how
 * Fix line endings on Windows system (b7b25da75f794e1bd1c1f6b74a9d4cd6a83e3435)
 * Fix option that accept arguments (979d87ef6953f0f4a9403db4bb244c87987ea478)
 * Add verbosity level and timestamps (9de0bb4155911c5399d9d2ddb0cbff9dfc25f88f)
+* Add new command `eask concat` ()
 
 ## 0.2.x
 > Released Mar 26, 2022
diff --git a/lisp/_prepare.el b/lisp/_prepare.el
index 4a9d2752..76bbfb49 100644
--- a/lisp/_prepare.el
+++ b/lisp/_prepare.el
@@ -99,14 +99,16 @@
 (defun eask-debug-p ()  (eask--flag "--debug"))  ; --debug
 
 ;;; String (with arguments)
-(defun eask-proxy ()       (eask--flag-value "--proxy"))
-(defun eask-http-proxy ()  (eask--flag-value "--http-proxy"))
-(defun eask-https-proxy () (eask--flag-value "--https-proxy"))
-(defun eask-no-proxy ()    (eask--flag-value "--no-proxy"))
+(defun eask-proxy ()       (eask--flag-value "--proxy"))        ; --proxy
+(defun eask-http-proxy ()  (eask--flag-value "--http-proxy"))   ; --http-proxy
+(defun eask-https-proxy () (eask--flag-value "--https-proxy"))  ; --https-proxy
+(defun eask-no-proxy ()    (eask--flag-value "--no-proxy"))     ; --no-proxy
+(defun eask-destination () (eask--flag-value "--dest"))         ; --dest, --destintation
+(defalias 'eask-dest #'eask-destination)
 
 ;;; Number (with arguments)
-(defun eask-depth () (eask--str2num (eask--flag-value "--depth")))  ; --depth is enabled
-(defun eask-verbose () (eask--str2num (eask--flag-value "--verbose")))
+(defun eask-depth () (eask--str2num (eask--flag-value "--depth")))       ; --depth
+(defun eask-verbose () (eask--str2num (eask--flag-value "--verbose")))   ; -v, --verbose
 
 (defun eask--handle-global-options ()
   "Handle global options."
@@ -181,7 +183,8 @@ other scripts internally.  See function `eask-call'.")
 (defconst eask--option-args
   (eask--form-options
    '("--proxy" "--http-proxy" "--https-proxy" "--no-proxy"
-     "--verbose" "--silent"))
+     "--verbose" "--silent"
+     "--dest"))
   "List of arguments (number/string) type options.")
 
 (defconst eask--command-list
@@ -474,4 +477,12 @@ Standard is, 0 (error), 1 (warning), 2 (info), 3 (log), 4 or above (debug)."
   "Return t if single file package."
   (not (eask-package-multi-p)))
 
+;;
+;;; User customization
+
+(defcustom eask-dist-path "dist"
+  "Name of default target directory for building packages."
+  :type 'string
+  :group 'eask)
+
 ;;; _prepare.el ends here
diff --git a/lisp/concat.el b/lisp/concat.el
new file mode 100644
index 00000000..1e61a1aa
--- /dev/null
+++ b/lisp/concat.el
@@ -0,0 +1,46 @@
+;;; concat.el --- Byte compile all Emacs Lisp files in the package  -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;;
+;; Byte compile all Emacs Lisp files in the package
+;;
+;;   $ eask concat [names..]
+;;
+;;
+;;  Initialization options:
+;;
+;;    [names..]          specify files to concatenate
+;;
+;;  Action options:
+;;
+;;    [destintation]     optional output destintation
+;;
+
+;;; Code:
+
+(load-file (expand-file-name
+            "_prepare.el"
+            (file-name-directory (nth 1 (member "-scriptload" command-line-args)))))
+
+(eask-start
+  (let* ((name (eask-guess-package-name))
+         (files (or (eask-args) (eask-package-el-files)))
+         (eask-dist-path (or (eask-dest) eask-dist-path))
+         (eask-dist-path (expand-file-name eask-dist-path))
+         (target-file (concat name ".built.el"))
+         (target-filename (expand-file-name target-file eask-dist-path)))
+    (eask-debug "Destination path in %s" eask-dist-path)
+    (ignore-errors (make-directory eask-dist-path t))
+
+    (eask-info "Prepare to concatenate files %s..." target-filename)
+    (write-region "" nil target-filename)
+
+    (eask-with-verbosity 'log
+      (with-temp-buffer
+        (dolist (filename files)
+          (message "Visit file %s... append!" filename)
+          (insert-file-contents filename))
+        (eask-info "Done. (Wrote file in %s)" target-filename)
+        (write-region (buffer-string) nil target-filename)))))
+
+;;; concat.el ends here
diff --git a/lisp/exec-path.el b/lisp/exec-path.el
index e88ba797..13932f6d 100644
--- a/lisp/exec-path.el
+++ b/lisp/exec-path.el
@@ -6,11 +6,6 @@
 ;;
 ;;   $ eask path
 ;;
-;;
-;;  Effective flags:
-;;
-;;    [-g, --global]
-;;
 
 ;;; Code:
 
diff --git a/lisp/install.el b/lisp/install.el
index 80a9aa37..6e55c070 100644
--- a/lisp/install.el
+++ b/lisp/install.el
@@ -13,10 +13,6 @@
 ;;                  package from current directory by calling function
 ;;                  `package-install-file'
 ;;
-;;  Effective flags:
-;;
-;;    [-g, --global] [--development, --dev]
-;;
 
 ;;; Code:
 
diff --git a/lisp/list-all.el b/lisp/list-all.el
index b31b9865..82063b46 100644
--- a/lisp/list-all.el
+++ b/lisp/list-all.el
@@ -11,10 +11,6 @@
 ;;
 ;;    [--depth]  dependency level to print
 ;;
-;;  Effective flags:
-;;
-;;    [-g, --global]
-;;
 
 ;;; Code:
 
diff --git a/lisp/list.el b/lisp/list.el
index 2353af27..6f03db3c 100644
--- a/lisp/list.el
+++ b/lisp/list.el
@@ -11,10 +11,6 @@
 ;;
 ;;    [--depth]  dependency level to print
 ;;
-;;  Effective flags:
-;;
-;;    [-g, --global]
-;;
 
 ;;; Code:
 
diff --git a/lisp/load-path.el b/lisp/load-path.el
index b6948c66..f07fc437 100644
--- a/lisp/load-path.el
+++ b/lisp/load-path.el
@@ -6,11 +6,6 @@
 ;;
 ;;   $ eask load-path
 ;;
-;;
-;;  Effective flag:
-;;
-;;    [-g, --global]
-;;
 
 ;;; Code:
 
diff --git a/lisp/load.el b/lisp/load.el
index 4e8fe60b..efb6d5e2 100644
--- a/lisp/load.el
+++ b/lisp/load.el
@@ -6,11 +6,6 @@
 ;;
 ;;   $ eask load
 ;;
-;;
-;;  Effective flag:
-;;
-;;    [-g, --global]
-;;
 
 ;;; Code:
 
diff --git a/lisp/outdated.el b/lisp/outdated.el
index 3da395ff..c9c6f2c7 100644
--- a/lisp/outdated.el
+++ b/lisp/outdated.el
@@ -6,11 +6,6 @@
 ;;
 ;;   $ eask outdated
 ;;
-;;
-;;  Effective flag:
-;;
-;;    [-g, --global]
-;;
 
 ;;; Code:
 
diff --git a/lisp/package.el b/lisp/package.el
index 88305ab1..25af86ae 100644
--- a/lisp/package.el
+++ b/lisp/package.el
@@ -4,12 +4,12 @@
 ;;
 ;; Build a package artefact, and put it into the given destination
 ;;
-;;   $ eask package [dest]
+;;   $ eask package [destintation]
 ;;
 ;;
 ;;  Positional options:
 ;;
-;;    [dest]     destination path/folder
+;;    [destintation]     destination path/folder
 ;;
 
 ;;; Code:
@@ -18,11 +18,6 @@
             "_prepare.el"
             (file-name-directory (nth 1 (member "-scriptload" command-line-args)))))
 
-(defcustom eask-dist-path "dist"
-  "Name of default target directory for building packages."
-  :type 'string
-  :group 'eask)
-
 (defun eask-package-dir-recipe ()
   "Form a directory recipe."
   (eask-load "./extern/package-recipe")
@@ -39,7 +34,7 @@
 
 (defun eask--packaged-file (ext)
   "Find a possible packaged file."
-  (let* ((dist (expand-file-name eask-dist-path))
+  (let* ((dist eask-dist-path)
          (file (expand-file-name (concat (eask-packaged-name) "." ext) dist)))
     (and (file-exists-p file) file)))
 
@@ -49,8 +44,9 @@
 
 (eask-start
   (let ((eask-dist-path (or (eask-argv 0) eask-dist-path))
+        (eask-dist-path (expand-file-name eask-dist-path))
         (packaged))
-    (ignore-errors (make-directory (expand-file-name eask-dist-path) t))
+    (ignore-errors (make-directory eask-dist-path t))
 
     (eask-pkg-init)
     (eask-package-install 'package-build)
@@ -59,7 +55,7 @@
     (let* ((version (eask-package-get :version))
            (rcp (eask-package-dir-recipe))
            (package-build-working-dir default-directory)
-           (package-build-archive-dir (expand-file-name eask-dist-path)))
+           (package-build-archive-dir eask-dist-path))
       (package-build--package rcp version))
 
     (setq packaged (eask-packaged-file))
diff --git a/lisp/uninstall.el b/lisp/uninstall.el
index df5bcf5c..07011876 100644
--- a/lisp/uninstall.el
+++ b/lisp/uninstall.el
@@ -11,10 +11,6 @@
 ;;
 ;;    <name>     name of the package to uninstall
 ;;
-;;  Effective flag:
-;;
-;;    [-g, --global], [-f, --force]
-;;
 
 ;;; Code:
 
diff --git a/lisp/upgrade.el b/lisp/upgrade.el
index d69456d2..8d543d72 100644
--- a/lisp/upgrade.el
+++ b/lisp/upgrade.el
@@ -11,10 +11,6 @@
 ;;
 ;;    [names..]     package to upgrade; else we upgrade all packages
 ;;
-;;  Effective flag:
-;;
-;;    [-g, --global], [-f, --force]
-;;
 
 ;;; Code: