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Square Brackets [ ]
The square brackets ( [ ] ) indicate that the enclosed element (parameter, value, or information) is optional. You can choose one or more items or no items. Do not type the square brackets themselves in the command line.
Example: [global options], [source arguments], [destination arguments]
Angle Brackets < >
The angle brackets ( < > ) indicate that the enclosed element (parameter, value, or information) is mandatory. You are required to replace the text within the angle brackets with the appropriate information. Do not type the angle brackets themselves in the command line.
Example: -f [set the File Name variable], -printer , -repeat , date access
In Unix-like systems, the ASCII hyphen–minus is commonly used to specify options. The character is usually followed by one or more letters. An argument that is a single hyphen–minus by itself without any letters usually specifies that a program should handle data coming from the standard input or send data to the standard output. Two hyphen–minus characters ( -- ) are used on some programs to specify "long options" where more descriptive option names are used. This is a common feature of GNU software.
Just do 'ls --help' and look at the options, it should be obvious to you.
-A, --almost-all do not list implied . and ..
--author with -l, print the author of each file
-b, --escape print octal escapes for nongraphic characters
--block-size=SIZE use SIZE-byte blocks
-B, --ignore-backups do not list implied entries ending with ~
-c with -lt: sort by, and show, ctime (time of last
modification of file status information)
with -l: show ctime and sort by name
otherwise: sort by ctime'
-C list entries by columns
--color[=WHEN]
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