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Right choice is (d) k and J

For EXPLANATION I would SAY: For MOVING the cursor up and down, we can USE ‘k’ and ‘j’ keys respectively.

k– moves the cursor up

j– moves the cursor dow

Right choice is (a) command

To ELABORATE: To EXECUTE NAVIGATION commands, the user should be in command MODE of vi EDITOR.

The correct option is (d) :RECOVER and -r

To ELABORATE: To recover from a crash, we can USE either the ex-mode command :recover or VI -r filename to recover as much of filename as POSSIBLE.

The CORRECT ANSWER is (a) True

The best I can explain: ACCIDENTS can happen while working on a system like a system or power FAILURE. To recover from these kinds of issues vi stores most of its information in a hidden SWAP file. This file is removed on a successful exit from vi but it remains on the disk if there is an improper shutdown or power failure.

Right OPTION is (d) fg and exit

Explanation: To run to your EDITOR, we can USE either fg command or exit command. It depends on the way we escape to the UNIX shell. If we had escaped using ‘:sh’ then use exit command or ctrl-D to RETURN to the editor and if you had used ctrl-Z then use fg command to return to the editor.

Right option is (d) using ‘:sh’ command and using ctrl-Z

Easiest EXPLANATION: We can escape to the shell without quitting the editor using ‘:sh’ command or ctrl-Z. Sometimes it is NECESSARY to RETURN to shell PROMPT to execute a UNIX command or compile our program. For this purpose, we use these commands.

Right choice is (B) :W 1,$ file002

The explanation: FIRST command will save from current line to the last line, the THIRD command will save current line while the fourth command will save the last line in the file named file002.

The correct answer is (C) : 4w file002

The best I can explain: To write selected line(s) to another file, we can USE ex-mode COMMAND ‘:w’ along with the line number and FILENAME.

Correct option is (d) .

To explain: In ex-mode, the current line is represented by a (.) while : is used to invoke the ex-mode commands. The > is a REDIRECTION SYMBOL used for redirecting OUTPUT to a specified file.

Right answer is (c) :q!

For explanation I would say: If the buffer has been changed and we STILL want to abandon the CHANGES, then ‘:q!’ is used. It simply ignores all the changes made and quits without DISPLAYING any WARNING QUESTIONS.

The correct option is (a) True

Best explanation: QUIT COMMAND has a safety MECHANISM that prevents US from aborting if the contents of the BUFFER are modified but not saved.

The correct option is (c) :Q

Explanation: It is possible to abort the editing process and quit the editing mode without SAVING the buffer. The quit (:q) command PERFORMS this JOB.

The correct answer is (a) ZZ

The EXPLANATION: The best and preferred way to save and quit the EDITOR is to use ZZ, a command MODE command which is way better then ‘:X’ or :wq.

Right answer is (C) ‘:x’

For EXPLANATION I would SAY: ‘:x’ command SAVES our content and quits the EDITOR simultaneously. This command is invoked in ex-mode.

The CORRECT answer is (b) :wq

To EXPLAIN I WOULD SAY: We can also use the ‘:wq’ command to save and quit editor but it requires an additional keystroke and it is not recommended for use.

The CORRECT choice is (a) True

The BEST I can explain: Pressing ‘:W’ doesn’t QUIT the editor but simply saves the editing we’ve done so FAR in the specified file.

Correct answer is (a) :W

To elaborate: For saving a file and to remain in editor we can use ‘:w’ command in ex-mode. It is generally considered a GOOD practice to save the contents of buffer regularly while working with FILES using ‘:w’.

The CORRECT answer is (b) ‘:X’

The EXPLANATION: Pressing ‘:x’ in ex-mode will save the file on the disk and returns the SHELL prompt.

Correct option is (a) ex-MODE

Explanation: To invoke ex-mode we’ve to PRESS the ‘:’ key in COMMAND mode. After pressing : , we are in ex-mode. Now simply type any command of ex-mode to PERFORM a suitable function.

The correct OPTION is (d) :q

The EXPLANATION: All the above commands are used for EITHER APPENDING or replacing except :q which is used in ex-mode to quit from vi editor.

Right choice is (c) ex

The EXPLANATION is: ex-mode allows US a feature in which we can SAVE the editing that we have performed on a FILE. ex-mode also provides us FEATURES like quitting vi editor, substitution etc.

Correct answer is (a) True

Easy EXPLANATION: ‘O’ command allows us to insert an empty line above the CURRENT cursor location. Hence, to CREATE a space for entering a NEW line of text above the current cursor location, ‘O’ command is USED.

Right option is (a) o

For explanation I would SAY: ‘o’ command allows US to CREATE a new line for entering the new text below the current cursor LOCATION.

Correct OPTION is (a) True

To explain I WOULD SAY: After REPLACING text with ‘s’ or ‘S’ we are automatically left in insert mode.

The correct answer is (c) 5S

The explanation is: To REPLACE multiple CHARACTERS, we can use the repeat factor. 5s replaces five characters with NEW text whatever will be entered.

The CORRECT choice is (a) s

Best explanation: ‘s’ is used to replace a SINGLE character with MANY characters. It replaces a single character based on the current cursor position with a group of characters.

Right OPTION is (b) R

The explanation is: The only difference between ‘r’ and ‘R’ is that ‘R’ can replace all text on the right of the cursor POSITION while ‘r’ only REPLACES a single character.

Right answer is (a) True

For EXPLANATION: When ‘R’ is pressed, vi momentarily switches from command mode to INPUT mode and returns to command mode AUTOMATICALLY after the new character is entered.

The CORRECT choice is (a) r

For explanation: To replace a SINGLE character based on cursor location, ‘r’ command is USED. To replace a single character, TYPE ‘r’ followed by the character that replaces it. It replaces a single character under the cursor.

Right answer is (b) I

Explanation: ‘I’ command is USED to INSERT text at the beginning of current line IRRESPECTIVE of the CURSOR POSITION in the current line.

The correct answer is (a) A

For EXPLANATION: To append text at end of CURRENT LINE use ‘A’ COMMAND. It appends the text at line EXTREME.

Correct answer is (b) a

Easiest EXPLANATION: To append text after the current cursor LOCATION, USE the ‘a’ command. If there is already existing text after the cursor location then it will be simply shifted TOWARDS the right.

The correct answer is (d) i

The best I can EXPLAIN: If the ‘i’ command is INVOKED with the cursor positioned on the EXISTING text, text on the right of the cursor will be shifted further right without getting overwritten.

The correct option is (a) EDITING text in files

Best explanation: To enter text in a file, we have to first SWITCH to INPUT MODE. To enter into input mode, press ‘i’ once. Any key PRESSED after that will appear on the screen as text input.

Right choice is (C) ed

Explanation: The FIRST editor that was used in UNIX SYSTEMS was ‘ed’.The main reason behind the replacement of ‘ed’ was that it can only edit FILES in the current DIRECTORY and cannot execute shell commands.

Right choice is (d) :Q!

To elaborate: For quitting VI editor, there are NUMEROUS ways available in ex-mode as well as in command mode. One WAY of which is to type ‘:q!’ in ex-mode.

Correct option is (a) buffer

Explanation: If the FILE has not been saved yet then whatever we are inputting in it is stored in a temporary storage called buffer. To save the DATA ENTERED in the buffer, we have to SWITCH to ex-mode.

The correct option is (b) False

For EXPLANATION: VI commands are case-sensitive. For EXAMPLE, ‘a’ and ‘A’ are DIFFERENT commands.

Right ANSWER is (B) ctrl-l

The EXPLANATION is: If the SCREEN gets garbled due to some reasons, we can USE ctrl-l in command mode to wipe out. It will simply clear your terminal.

Right option is (a) True

To explain I would say: Command mode is the mode in which we can pass commands to act on text, using most of the keys of the keyboard. Pressing a KEY doesn’t show it on screen but may perform a function LIKE moving the cursor to the next LINE, deleting a line etc.

The correct option is (a) True

For explanation: ONE of the major functions performed in ex-mode is, saving our work. For EXAMPLE, to save our FILE invoke the following command :

The CORRECT answer is (d) esc

Explanation: Command mode allows US to enter commands for performing operations on the TEXT entered. To switch from the input mode to command mode press the ‘esc’ key. This OPERATION will not be displayed on the screen but changes our mode to command mode.

The correct option is (a) i

To explain I WOULD say: To SWITCH from COMMAND mode to input mode press the ‘i’ KEY.