Linux common Commands (a)--history command

The history record has entered commands without any parameters and displays the default number of command histories directly.

(1) View and modify history settings.

in the user's home directory, such as the/root directory, exists. Bash_profile and . Bash_profile these two files.

which . Bash_history is the history of the command that records the number of directory entries.

The. Bash_profile is the set history property.

Such as:

1, modify the number of Histroy saved.

Method One:

# User specific environment and startup programs

Path= $PATH: $HOME/bin

Export PATH

histsize=300

histfilesize=300

added at the end of the document histsize and Histfilesize two values. Setup is complete and restarting the terminal will take effect.

Method two, export histsize=10

2, modify the history of the display format

Export histtimeformat= '%F%T '

(2) How to use

History N: Shows the historical record of the nearest n bar

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Figure 1.1

history-d Offset: Delete the command entry at the specified offset

Delete History at 317, 1.2

History-d 317 After the deletion succeeds, the command at the original 317 is replaced with the command at 318, as shown in 1.3.

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Figure 1.2

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Figure 1.3

history-a [path]: Writes the history of a command in the current session to the specified file

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Figure 1.4

History-c: Emptying command history

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Figure 1.5

(3) Tips for use

!#: Execute the # command in the history of the command

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Figure 1.6

!: Executes the previous command

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Figure 1.7

!string: Executes the last command in the command history that begins with string;

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Figure 1.8

!$: Call the last parameter of the previous command

ESC,.: function Ibid.

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Figure 1.9

Second, help command

(1) View command type

Type COMMAND

such as: type history

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Figure 1.10

(2) Help commands for built-in commands

Help COMMAND

Like Help

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Figure 1.11

(3) Help commands for external commands

1. COMMAND--help

such as LS--help

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Figure 1.12

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Linux common Commands (a)--history command