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
