Shell base 2-History command and Tab/alias and shortcut keys __script-perl

Normally, the command is written when it needs to be exited, and the parameter-W is immediately written.

This profile is an important environment variable configuration file for Linux.

Command completion:

After you enter user, the two-time tab key lists all files that start with user.

This alias will fail after the reboot, so open the. bashrc file for modification.

I have defined a ll command, which is the following one, with color.

Print out the environment variable, the front plus a $ is the environment variable

This environment variable is separated by a colon, which is found by next to each other.

Bash internal commands are from the shell and we can't find it ourselves.

This is because the CD command is brought from the shell.

It is written in uppercase, but is used directly on the line; it does not need to be cased.