Linux[Foundation]-05--powerful and usable shell

Powerful and usable shell

Computer hardware is composed of arithmetic, controller, memory, input \ output device , etc.

The system kernel is the role that makes the computer hardware perform its duties.

The kernel is responsible for driving hardware, managing activities, and allocating \ managing Hardware Resources , so he cannot be manipulated by users

Because users cannot directly control the hardware or directly manipulate the kernel, they need to be based on the " system Call Interface" developed programs \ Services to meet the user's work

There are graphical tools such as Logical Volume Manager (LVM) in RHEL7, but people tend to write scripts with commands

Because the graphical tool is not flexible and consumes system resources more than

A lot of graphical tools are also called scripts to work, but many " functions" are " castrated"and less flexible ,

command scripts are more efficient than when they come up

Bash is the default character interpreter for most Linux systems,

Its advantages:

1. 1. Save History Command by default (can be viewed with the upper and lower keys)
2. 2. the command only needs to input the first few can use the TAB key to complete (but RHEL7 is more powerful parameter completion)
3. 3. Powerful batch-processing scripts
4. 4. Practical Environment Variables

Linux[Foundation]-05--powerful and usable shell