【shell编程】入门

1:一个可运行shell
[zhdc@localhost ~]$ vi one.sh 

#!/bin/bash
echo "one shell";

授予可运行的权限
[zhdc@localhost ~]$ chmod +x one.sh 

1:shell debug模式
[zhdc@localhost ~]$ vi one.sh
#!/bin/bash -x
echo "one shell";

[zhdc@localhost ~]$ ./one.sh 
+ echo 'one shell'
one shell

1:shell变量
[zhdc@localhost ~]$ ./one.sh
#!/bin/bash

V="变量";
DATE=`date`;
echo ${V};
echo ${DATE};

[zhdc@localhost ~]$ ./one.sh 
变量
Thu Apr 11 21:27:24 CST 2019

=号两边不能有空格