Shell命令解释器分类示例详解

目录1、命令解释器2、编程语言分类3、Shell脚本执行方式4、应用场景总结Shell命令解释器：介于 系统内核——>命令解释器——>外围应用程序：应用/命令/服务
Shell编程：bash编程

1、命令解释器 bash目前应用最广泛的一款命令解释器,红帽系列（默认）,Debain,Unbantu,BASH全称：Bourne-Again Shelldash一般Debain/Unbantu系统默认的，运行脚本推荐使用bash lidao.shcsh,tcsh一些unix系统使用zsh功能更多，支持更多的插件，可以更好看
2、编程语言分类 解析：直接解析型shell,python,书写代码后，通过对应解析器运行编译：需要编译后运行C,C++ 解释型

[root@localhost ~]# vim 1.py
[root@localhost ~]# cat 1.py
                    print("hrllo world!")
[root@localhost ~]# python 1.py
                    hrllo world!

[root@localhost shell]# vim 01.exec.way.sh
[root@localhost shell]# cat 01.exec.way.sh 
hostname
pwd
whoami
[root@localhost shell]# sh 01.exec.way.sh 
localhost.localdomain
/root/shell
root
[root@localhost shell]# bash 01.exec.way.sh 
localhost.localdomain
/root/shell
root
[root@localhost shell]# ll `which sh bash`
-rwxr-xr-x. 1 root root 964544 Apr 10  2018 /usr/bin/bash
lrwxrwxrwx. 1 root root      4 Mar 23 05:59 /usr/bin/sh -> bash

[root@localhost shell]# . 01.exec.way.sh 
localhost.localdomain
/root/shell
root
[root@localhost shell]# source 01.exec.way.sh 
localhost.localdomain
/root/shell
root

[root@localhost shell]# ./01.exec.way.sh
-bash: ./01.exec.way.sh: Permission denied
[root@localhost shell]# chmod +x ./01.exec.way.sh 
[root@localhost shell]# ls -l
total 4
-rwxr-xr-x. 1 root root 21 May  6 01:15 01.exec.way.sh
[root@localhost shell]# ./01.exec.way.sh
localhost.localdomain
/root/shell
root

[root@localhost shell]# sh < 01.exec.way.sh 
localhost.localdomain
/root/shell
root
[root@localhost shell]# bash < 01.exec.way.sh 
localhost.localdomain
/root/shell
root