$ echo Hello, shello! Hello, shello!
this is wired, isn’t it?
$ echo Hello, shello!! echo Hello, shelloecho Hello, shello! Hello, shelloecho Hello, shello!
improve with single quote
$ echo 'Hello, shello!!' Hello, shello!!
ls = list
$ ls
$ ls Downloads
cd = Change Directory
$ cd Downloads
$ cd .. ; ls
pwd = Print Working Directory
“ls .” is just same as “ls”
$ ls .
all of the files matched pdf.
$ ls -l Documents/*.pdf
$ mkdir Documents/Books $ mv 'Documents/1911 Webster Dictionary.epub' Documents/Books/ $ mv Documents/*.epub Documents/Books
