After installing Sencha and ExtJS, I have two folders
I create the folder sencha_apps.
$ cd sencha_apps
$ export PATH=$PATH:~/dev/lib/Sencha/Cmd
$ export PATH=$PATH:~/dev/lib/Sencha/Cmd/6.1.2.15
$ sencha -sdk ~/dev/lib/ext-6.0.2/cmd generate app App01 app01
Sencha Cmd v6.1.2.15
[INF] Processing Build Descriptor : classic
[INF] Loading app json manifest...
...
...
$ cd app01
$ ls -al
total 488
drwxr-xr-x 22 gMac staff 748 May 14 20:35 .
drwxr-xr-x 3 gMac staff 102 May 14 20:34 ..
drwxr-xr-x 6 gMac staff 204 May 14 20:35 .sencha
-rw-r--r-- 1 gMac staff 4615 May 14 20:35 Readme.md
drwxr-xr-x 7 gMac staff 238 May 14 20:35 app
-rw-r--r-- 1 gMac staff 990 May 14 20:35 app.js
-rw-r--r-- 1 gMac staff 18280 May 14 20:35 app.json
-rw-r--r-- 1 gMac staff 303 May 14 20:35 bootstrap.css
-rw-r--r-- 1 gMac staff 101584 May 14 20:35 bootstrap.js
drwxr-xr-x 4 gMac staff 136 May 14 20:35 build
-rw-r--r-- 1 gMac staff 1465 May 14 20:35 build.xml
drwxr-xr-x 4 gMac staff 136 May 14 20:35 classic
-rw-r--r-- 1 gMac staff 58181 May 14 20:35 classic.json
drwxr-xr-x 22 gMac staff 748 May 14 20:35 ext
-rw-r--r-- 1 gMac staff 1974 May 14 20:35 index.html
drwxr-xr-x 4 gMac staff 136 May 14 20:35 modern
-rw-r--r-- 1 gMac staff 36134 May 14 20:35 modern.json
drwxr-xr-x 2 gMac staff 68 May 14 20:35 overrides
drwxr-xr-x 2 gMac staff 68 May 14 20:34 packages
drwxr-xr-x 3 gMac staff 102 May 14 20:35 resources
drwxr-xr-x 8 gMac staff 272 May 14 20:35 sass
-rw-r--r-- 1 gMac staff 1486 May 14 20:35 workspace.json
$ sencha app build
Sencha Cmd v6.1.2.15
[INF] Processing Build Descriptor : classic
[INF] Loading app json manifest...
...
...
$ sencha web start
Sencha Cmd v6.1.2.15
[INF] Starting server on port : 1841
[INF] Mapping http://localhost:1841/ to ....
Opening the browser to
http://localhost:1841 I see a pretty nice web page.