History commands in CentOS: history

[Root @ linux ~] # History [n] [root @ linux ~] # History [-c] [root @ linux ~] # History [-raw] histfiles parameter: n: number, meaning "list of the last n commands! -C: delete all history content in the current shell.-a: add the newly added history Command to [root @ linux ~]. # History [n]
[Root @ linux ~] # History [-c]
[Root @ linux ~] # History [-raw] histfiles
Parameters:
N: number, which indicates "list of the nearest n commands!
-C: removes all history content in the current shell.
-A: adds the newly added history Command to histfiles. if histfiles is not added,
Write by default ~ /. Bash_history
-R: read the content of histfiles to the history memory of the current shell;
-W: write the current history memory to histfiles!
Example:
Example 1: list all history memories in the current memory
[Root @ linux ~] # History
# Omitted earlier
1017 man bash
1018 ll
1019 history
1020 history
# The information listed is divided into two columns. The first column shows the code of this command in this shell,
# The other is the instruction content! As for how many command records will be displayed, it is related to HISTSIZE!
Example 2: list the latest 3 documents
[Root @ linux ~] # History 3
1019 history
1020 history
1021 history 3
Example 3: Immediately write the current data to histfile
[Root @ linux ~] # History-w
# The historical records are written to ~ by default ~ /. Bash_history!
[Root @ linux ~] # Echo $ HISTSIZE
1000