shell 的一些案例以及语法
#大于95 输出yesBootUsage=`df -hT | grep "/boot" | awk '{print $6}' | cut -d "%" -f 1`
[ $BootUsage -gt 95 ] && echo "YES"
#如果输入的是/etc/inittab 那么输出YES
read -p "Location：" FilePath
[ $FilePath = "/etc/inittab" ] && echo "YES"
#/boot文件夹大于80%执行
#!/bin/bash
RATE=`df -hT | grep "/boot" | awk '{print $6}' | cut -d "%" -f1 `
if[$RATE-gt80]
then
echo "Warning,DISK is full!"
fi
#检测mysql服务是否启动停止就启动
#!/bin/bash
service mysqld status &> /dev/null
if[$?-eq0]
then
echo"mysqld service is running."
else
/etc/init.d/mysqldrestart
fi
#超过100的用户打印
#!/bin/bash
DIR="/opt"
LMT=100
ValidUsers=`grep "/bin/bash" /etc/passwd | cut -d ":" -f 1`
for UserNamein$ValidUsers
do
Num=`find $DIR -user $UserName | wc -l`
if[$Num-gt$LMT];then
echo "$UserName have $Num files."
fi
done
#while语法
while可用内存 /dev/null
i=`expr $i + 1`或者用lee i++
done
#删除20个用户
#!/bin/bash
i=1
while[$i-le20]
do
userdel -r stu$i
i=`expr $i + 1`
done
#创建启动脚本
#!/bin/bash
case $1 in
start)
echo"Start MySQL service."
;;
stop)
echo"Stop MySQL service."
;;
*)
echo"Usage：$0start|stop"
;;
esac
#判断输入的是字符还是字母
#!/bin/bash
read-p"Press some key, then press Return:“KEY
case"$KEY“in
|)
echo "It's a letter."
;;
)
echo "It's a digit."
;;
*)
echo "It's function keys、Spacebar or other keys. "
esac
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