Linux Five week third session (March 7) Notes

Five Week third session (March 7)
8.1 Shell Introduction
8.2 Command History
8.3 Command Completion and aliases
8.4 Wildcard Characters
8.5 Input and output redirection

Search to see if there are none of these two shells, not installed.

8.2 Command History

Used command, in/root/.bash_history.

Check out the/root/.bash_history with the cat command

You can use command history to view previously used commands

History-c

The/etc/profile configuration file is modified and the source command is run to make it effective.

Specifies when to run.

The variable has changed.

Historical command.

To take effect, you need to edit the configuration file/etc/profile,

Input/histsi

Find the histsize=5000 and put it and the variable histsize together.

Re-open the Linux system and run the history

History command records can only be appended and cannot be deleted.

Abnormal exit, the command will not be fully logged.

Run 761 history commands.

Run a recent history command with Echo.

8.3 Command Completion and aliases

TAB key to complete the command and path.

When multiple commands start with LS, double-click the TAB key.

When multiple commands start with MK, double-click the TAB key.

When a command starts with a mkt, press the TAB key.

CentOS6 can only complete commands, and CentOS67 adds the function of complement parameters. To install a package.

Reboot to make it effective.

The following parameters can also be complete

The alias is faster than the TAB key completion.

Run the command alias, you can not put all the names out.

Part of the alias is placed in the file. BASHRC.

And a part of the alias is on/etc/profile.d/.

Open it and look.

Command Unlias to cancel the alias.

8.4 Wildcard Characters

8.5 Input and output redirection

Linux Five week third session (March 7) Notes