1. Bash 介绍

Posted 2020-08-10

你可以通过 $cat /etc/shells 来查看当前系统支持哪些shell类型。

[[email protected] log]# cat /etc/shells 
/bin/sh
/bin/bash
/sbin/nologin
/bin/dash

 

你默认的shell类型在/etc/passwd文件下

eye:x:500:500::/home/eye:/bin/bash

 

Bash是一个GNU Shell, 当它启动时，会去读他的启动配置文件

• /etc/profile
• ~/.bash_profile
• ~/.bashrc

 

Shell 第一个案例

#!/bin/bash

clear

echo "The script starts now."

echo "Hi, $USER"
echo

echo "I will now fetch you a list of connected suers:"
echo 
w
echo

echo "I‘m setting two variables now."
COLOUR="black"
VALUE="9"
echo "This is a string: $COLOUR"
echo "And this is a number: $VALUE"
echo

echo "I‘m giving you back your prompt now."
echo