SAM-03

• Scripts are written in text editors
• Many Linux programs use text-based data files for input
• Many of Linux-operating system services use configuration files that are text-based
• emacs can be customized and extended with different modes, enabling it to be used like IDE for programming languages such Java or C. It has be installed first
• nano is a text editor editor designed for beginners
• gedit comes with the Gnome desktop. It only runs in the GUI environment
• vi is a native editor found in all Linux and Unix systems. Most Linux distributions do not include real vi; rather, they include an enhanced replacement called vim (short for vi improved)
• 3 Modes of vi editor

  command

  insert

  replace
• command: keystrokes entered operate as command rather than characters entered into the document
• insert: any character entered is placed at the current cursor position
• replace: any character entered replaces the character at the current cursor position
• creating a new file:

  vi sample.txt
• confirmation message:

  "sample.txt" [New File]
• to add text, press 'i' key
• to exit insert mode and return to command mode, press Esc
• to save the changes you have change, press the :w command
• l or right arrow : one character to the right
• h or left arrow " one character to the left
• j or down arrow : one line down
• k or up arrow : one line up
• 0 : to the beginning of the current line
• ^ : to the first non-whitespace character on the current line
• $ : to the end of the current line
• w : to the beginning of the next word or punctuation character
• W : to the beginning of the next word, ignoring punctuation characters
• ctrl+f or page down : page down
• ctrl+b : one page up
• numberG : to line number ex: 1G
• G : to the last line of the file
• A : to append text to an existing file, moves the cursor to the end of the line before starting insert mode
• o : insert the line below the current line
• O : insert the line above the current line
• x : delete current character
• 3x : deletes current character and the next two characters
• dd : deleted the current line
• 5dd : deletes the current line and the next four lines
• dW : deletes from the current cursor position to the beginning of the next word
• d$ : deletes from the current cursor location to the end of the current line
• d0 : deleteds from the current cursor location to the beginning of the line
• d^ : deletes from the current cursor location to the first non-whitespace character in the line