history - shell history and Tab cpmpletion

Path for store history file

~/.bash_history
~/.history
~/.histfile

history command

history   #Displays the shell history
histsize  #controls the number of commands to retain in history
export HISTSIZE=1000   #defualt 500

!N  #Repeat command line number N
!!  #Repeat the previous command line
!string  #Repeat the most recent command starting with "string"

!:N <Event> <Sepatator> <Word>
!  #Represents a command line(or event) 
   #!=The most recent command line.
   #!=!!
:N  #Represent a word on the command line 
  0 = command, 1 = first atgument,etc
  
#Example
$head files.txt sorted_files.txt notes.txt
<Output from head command here>
$!!
head files.txt sorted_files.txt notes.txt
<Output from head command here>
$vi !:2
vi sorted_files.txt
<vi editor starts>

!^   #Represents the first atgument.
      1^ = !:1
!$   #Represents the last argument.

$head files.txt sorted_files.txt notes.txt
!^ = files.txt
!$ = notes.txt

Searching shell history

Ctrl-r #Reverse shell history search
Enter  #Execute the command
Arrows #Change the command
Ctrl-g #Cancel the search

Tab Completion

Tab autocompletion

• Commands

• Files, directories, paths

• Environment Variables

• Usernames(~)