Getting help

The user can get help in two ways.

The first is by using the help command. The user can also enter a question mark ‘?’ at each position in the command. The displayed result depends on the execution mode and previous input.

Terminal Key Function

Following is the list of all the terminal keys and their function.

 

Table 5-1 List of Terminal Keys

TAB

Attempt to perform completion on the text before point

TAB TAB

Display the next keyword of this command

?

Display help of command

ENTER

Execute input

DEL or BACKSPACE

Delete the character to the left of the cursor

UP Arrow

History of last input line

DOWN Arrow

History of previous input Line

CTRL-d

Delete the character at point. If point is at the beginning of the

line, there are no characters in the line, and the last character

 

typed was not bound to delete-char, then return EOF.

CTRL-a

Move to the start of the line

CTRL-e

Move to the end of the line

CTRL-f

Move Forward one character

CTRL-b

Move Back one character

CTRL-c

Force to interrupt

CTRL-k

Kill the text from the current cursor to the end

CTRL-p

Move ‘back’ through the history list, fetching the previous

command.

 

 

 

CTRL-n

Move ‘forward’ through the history list, fetching the next

command.

 

 

 

CTRL-r

Search backward starting at the current line and moving ‘up’

through the history as necessary. This is an incremental search.

 

 

 

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