By Darl Kuhn
This can be an exceptional Linux reference for an Oracle DBA.
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Extra resources for Linux Recipes for Oracle DBAs
The output also indicates there is a built-in Bash version of the command (see recipe 2-15 for more details about built-in commands). fm Page 14 Tuesday, September 2, 2008 1:53 PM 14 CHAPTER 1 ■ 1-5. GETTING HELP Another interesting use of the whatis command is to view a one-line description of commands in the /bin directory. This example uses whatis with ls, xargs, and less to view, one page at a time, the descriptions of all commands in the /bin directory: $ cd /bin $ ls | xargs whatis | less The previous line of code will first list the files in the /bin directory; then, the output of that is piped to the xargs command.
Ctrl+U Clear out everything to the left of the prompt. Ctrl+T Transpose two characters that are immediately to the left of the prompt. Alt+T Transpose two words that are to the left of the prompt. Problem Your screen has become cluttered with command output. You want to clear the screen of any previously displayed text or command output. Solution Either use the clear command or press Ctrl+L to clear your terminal screen. The clear command works in most Linux/Unix shells, and it does what you would expect—it clears the screen.
The tilde character is a shorthand way to reference your home directory. This is set for you when you log on. PWD Contains the location of the current working directory. This is set whenever you use cd to navigate to a new directory. SHELL Contains the name of your login shell. EDITOR Holds the name of the default editor used with some utilities (such as cron). PS1 Contains the values used for displaying the command prompt. SHLVL Keeps track of how many subshell levels deep your current shell is.