History Command parsing

View history Commands

History #显示所有历史命令history #显示最近的10条命令

To view the number of default history command bars:

Echo $HISTSIZE

This environment variable is defined in/etc/profile.

LS!407 # re-calls a positive number in history No. 407 command command LS!-4 #重新调用历史中的倒数第4条命令

Historical commands are stored in two parts:. Bash_history and Memory

When you exit normally, the in-memory history is stored in the. bash_history

Executes the first last command starting with shut

!shut

Execute the previous command containing go

!? Go

• Execute the command you just executed

1: Up and down key turn 2:ctrl+p3:!! 4:! -1

• Search executed command:

Ctrl+r

• Using Parameters

Use parameters from several commands that you have just executed, but the commands are different: (Take the command LS for example)

ls esc.      #按完ESC, press directly after loosening. ls alt+.ls !^   # The first parameter of the previous command ls !$    #表示上一个命令的最后一个参数ls  !:2   #调用上一个命令中的第二个参数ls  !*     #调用上一个命令中的所有参数ls  !444:2    #调用history中第444个命令的第2个参数ls  !444:*     #调用第444个命令中的所有参数 

The Alt method is not useful in the non-host and screen

• Clear all History

history -c           #清除内存中的命令历史rm  ./bash_history     #删除历史文件中的内容HISTSIZE =0          #  Clears the memory history by modifying the history command bar number 

• Other options

history [-c][-d offset]history -a|n|r|w [filename]history -p|s arg [arg  ... ]history -d num   #删除指定的条目history  -a   #强制内存中的history追加到./bash history -n   #常用于多用户登陆 in the _history file, loading the contents of the history file that have not been loaded into the history list history -r  #  read from .bash_history reads the history -w   #将当前内存中的历史, appends to the specified file, and defaults to. Bash_ historyhistory -p rm -rf /   #只显示命令, not added to the history list history -s rm - rf /   #不显示命令, but adds the command to the history list 

history-p & History-s

[[email protected] wu]# history-p rm-rf m rm-rfm[[email protected] wu]# History 3 262 ls-d * 263 ll-d * hist Ory 3[[email protected] wu]# history-s rm-rf/[[email protected] wu]# History 3 3 265 rm-rf/266 Tory 3

History Command parsing