Shell编程进阶 1.2 shell结构及执行

创建一个shell脚本

mkdir shell

vim first.sh

#!/bin/bash
##The first test shell script.
##Written by wangshaojun.

ls /tmp/
echo "my home is $HOME"
echo "This is first script"

执行shell脚本，两种方法

bash first.sh

mysql.sock www_slow.log
2015-12-31.wangshaojun.root.history-timestamp pear www.sock
2016-01-01.wangshaojun.root.history-timestamp www1.sock
my home is /root
This is first script.

或者 

sh first.sh

第二种方法

chmod a+x first.sh

./first.sh

绝对路径

/root/shell/first.sh

脚本的执行过程

sh -x first.sh

+ ls /tmp
12334 mysql.sock www_slow.log
2015-12-31.wangshaojun.root.history-timestamp pear www.sock
2016-01-01.wangshaojun.root.history-timestamp www1.sock
+ echo 'my home is /root'
my home is /root
+ echo 'This is first script.'
This is first script.

可以排查错误