$ sudo apt-get install nodejs
$ sudo apt-get install npm
$ sudo npm install -g cordova
$ sudo npm install -g ionic
successfully done above commands but then I type
$ ionic start todo blank
but cannot notice anything after that I type
$ cd todo && ls
command, I notice that
bash: cd: todo: No such file or directory
What you would need to check is that your ionic start command runs successfully. Most probably you are in a directory, where you don't have the permission to create the directory etc.