Format! It is quite difficult to follow a list of commands displayed as a paragraph with no separation between terms and its own definition...
Consistency! Double check what is listed as term and if it matches how it appears in its definition (Case in point: passwd)
Suggestion: Most UNIX command names -and thus Linux inheritance- are cryptic two or three characters long, so maybe you could elaborate a little as in: "ls [list sources] - used to view the contents of a directory (current directory by default)"