9、将/etc/issue文件中的内容转换为大写后保存至/tmp/issue.out文件中

9、将/etc/issue文件中的内容转换为大写后保存至/tmp/issue.out文件中。

 

关键命令：cat /etc/issue|tr a-z A-Z >/tmp/issue.out

 

范例：

[15:09:35 root@CentOS7 ~]#cat /etc/issue

\S

Kernel \r on an \m

 

[15:17:21 root@CentOS7 ~]#cat /etc/issue | tr a-z A-Z

\S

KERNEL \R ON AN \M

 

[15:17:57 root@CentOS7 ~]#cat /etc/issue | tr a-z A-Z > /tmp/issue.out

[15:18:19 root@CentOS7 ~]#cat /tmp/issue.out

\S

KERNEL \R ON AN \M