Linux Ch10 Editing Files

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Different editors

–Emacs–gedit–vi–pico–Nano–Kwrite and Kate
Plain Text Files
- Viewable with any editor
- No special formatting (no images or embedded features)
- Used for configuration files and scripts
- Use ASCII format (American Standard Code for Information Interchange)
- Moving to Unicode format
- Each line in a text file is usually no more than 80 characters long
- Contents: Human language files (README)
- Source code for Programs
- Formatted text files
- Program and System configuration files
- Log files and more
ASCII
- –Date to 1960’s
- Support only 7-8 bit codes
- Maximum of 128-256 characters
- Different variations
- Difficult to support languages other than English
Unicode
- More up to date coding scheme
- Can represent any alphabet in common use on Earth
- Different coding schemes within
- UTF-8 used to represent ASCII
- UTF-16 16 bit coding scheme
Text mode editors
- vi: Available on any Linux or Unix install
- Installed by default
- Runs in different modes
- very common editor (questions on certification exams)
- emacs: Available on any Linux or Unix install
- Installed by default
- Runs in different modes
- Can take a lot of resources
- pico: Small command-line editor
- nano: Clone of “pico”
- Extra features
GUI Editors
- emacs: Both GUI and text-mode
- gedit: Available with GNOME desktop
- Usually installed by default
- Much like Windows Notepad
- Kwrite and Kate: Editors for K Desktop Environment
- Nedit: Like Kwrite
- May have to be installed
Different ways to launch GUI editor
- From a file-manager double click the file and the default GUI editor will launch
- From a terminal session:
- gedit filename
- vi filename
vi” editor
- Very powerful program
- Available on virtually every Linux system
- Not easy to use
- Three modes within “vi”:
- Command Mode
- Ex Mode
- Insert Mode
Editing Files with vi
Basic steps:
- Open a file in vi
- Enter into Insert mode
- Add text to file
- Edit text in file
- Save file
- Exit vi
vi commands
- Edit a new file: :e filename
- Include an existing file: :r filename
- Execute an external command: :!command
- Quit: :q or :q!
- Write & Quit: :wq
vi Insert Mode
- This mode will allow you to actual make changes in the file
- When finished all changes make sure you press the “Esc” to return to “Command Mode”
- Then either save your changes and exit, or exit without saving.
- To save and quit: :wq
- To quit without saving: :q!
- To save and continue editing: :w
- To save with filename :w filename
- search for searchtext /searchtext
- search again for searchtext /[Enter] or n
- execute cmdName and return to vi
- :!cmdName
To start “vi”:
- Command: vi myfile
- The above command will begin “vi” session of the named file
- To actually start editing the file you can press the “i” key (insert)
Majority of system configuration files found in

“/etc” or a subdirectory within
User’s configuration resides
- in the user’s home directory
- configuration files usually begin with a “.” (hidden)
- Example: .bashrc
- Always make a copy before making any changes
Most configuration files contain
- comments:
- Used to explain specific functions or operations
- Read all comments
- Most comments usually begin with a “#” number sign
- Example: # The following routine sets a variable value
- Other comments may begin with a “;” semicolon
Named Variables
- $PATH
- $PS1 used to create your display prompt
- $HOSTNAME
- localhost.localdomain is default set during the installation of this system
- $HISTSIZE
- $HOME
- to see value echo $varName

Author

slc53

329698

Card Set

Linux Ch10 Editing Files

Description

Linux Ch10 Editing Files

Updated

2017-03-22T00:20:13Z

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