Linux核心基础篇-脚本初步入门

总结

01、清空/var/log/message下的日志信息：cat /var/log/message

#!/bin/bash
LOG_DIR=/var/log
ROOT_UID=0
if [ "$UID" -ne "$ROOT_UID" ];then
	echo "Must be root to run this scripts."
	exit 1
fi
cd $LOG_DIR||{
	echo "Can not change to necessary directory."
	exit 1
}
cat /dev/null>message&&{
	echo "Logs cleaned up."
	exit 0
}
echo "Logs cleaned up fail."
exit 1

02、检测系统是否存在漏洞：

env x='() { :;}; echo be careful' bash -c "echo this is a test"

03、升级bash：yum -y update bash

04、执行脚本的方法:(1)bash script-name或sh script-name；(2)source script-name或.script-name (3)sh<script-name或cat scripts-name|sh