Special Characters 5. Terminal Control Keys 6. Changing Your Password 7. Getting Information 8. All UNIX commands are case sensitive.
Most commands are in lower case.
In most cases, multiple arguments should be separated from each other by a space. By using a different option you can choose what is counted. It prints file1 followed by file2 and then file3 on the screen. Multiple commands can be entered on one line if you separate each with a semicolon. The first, cd newdir changes the current directory to the directory newdir.