SHELL训练营--day21_shell练习46-50

#网卡和IP
#!/bin/bash
ip add |awk -F ": " '$1 ~ "^[0-9]" {print $2}' > /tmp/ifs.txt

get_ip()
{
    ip add show dev $1 |grep inet |awk '{print $2}' | awk -F '/' '{print $1}'
}

for eth in `cat /tmp/ifs.txt`
do
    myip=`get_ip $eth`
    if [ -z "$myip" ]
    then
        etho $eth
    else
        echo $eth $myip
    fi
done > /tmp/if_ip.txt

if [ $# -ne 2 ]
then
    echo "请输入正确格式： bash $0 -i 网卡 或 bash $0 -I IP"
fi

if [ $1 == "-i" ]
then
    if awk '{print $1}' /tmp/if_ip.txt|grep -qw $2
    then
        ip1=`awk -v aeth=$2 '$1==aeth ' /tmp/if_ip.txt|sed "s/$eth //"`
        echo "网卡$1的IP是 $ip1"
    else
        echo "你指定的网卡不对，系统中的网卡前：`cat /tmp/ifs.txt|xargs`"
    fi
elif [ $1 == "-I" ]
then
    if grep -qw "$2" /tmp/if_ip.txt
    then
        eth=`grep -w " $2 " /tmp/if_ip.txt|awk '{print $1}'`
        echo "IP $2 对应的网卡是 $eth"
    else
        echo "你指定的IP不对，系统中的IP有：`ip add |grep inet |awk '{print $2}'|awk -F '/' '{print $1}'`| xargs"
    fi
else
    echo "清输入正确的格式：bash $0 -i 网卡 或 bash $0 -I IP"
fi

#随机三位数
#!/bin/bash
get_number()
{
    for i in `seq 0 2`
    do
        a[$i]=$[$RANDOM%10]
    done
    echo ${a[@]}|sed s'/ //g'
}

if [ $# -eq 0 ]
then
    get_number
elif [ $# -eq 1 ]
then
    n=`echo $1|sed 's/[0-9]//g'`
    if [ -n "$n" ]
    then
        echo "给定的参数必须是一个数字"
        exit
    fi
    for i in `seq 1 $1`
    do
        get_number
    done |xargs
else
    echo "格式不对， 正确格式是 sh $0 [n]"
fi

#是否是安装包
#!/bin/bash
if_install()
{
    rpm -q $1 >/dev/null 2>/dev/null
    if [ $? -eq 0 ]
    then
        echo "$1已经安装"
        return 0
    else
        echo "$1没有安装"
        return 1
    fi
}

if_install httpd
if [ $? -eq 0 ]
then
    if ! pgrep httpd >/dev/null
    then
        service httpd start
    fi
else
    yum install -y httpd
fi

if_install mysql-server
if [ $? -eq 0 ]
then
    if ! pgrep mysqld >/dev/null
    then
        service mysqld start
    fi
else
    yum install -y mysql-server
fi

#判断日期是否合法
#!/bin/bash
if [ $# -ne 1 ] || [ ${#1} -ne 8 ]
then
    echo "请输入正确格式：sh $0 yyyymmdd"
    exit 1
fi

y=`echo ${1:0:4}`
m=`echo ${1:4:2}`
d=`echo ${1:6:2}`

if echo $d|grep -q "^0"
then
    d=`echo ${1:6:2}|sed 's/^0//'`
fi

if cal $m $y >/dev/null 2>/dev/null
then
    if ! cal $m $y |grep -qw "$d"
    then
        echo "你给的日期不是合法的"
    else
        echo "日期合法"
    fi
else
    echo "你给的日期不合法"
fi

#监控网卡
#!/bin/bash
LANG=en
sar -n DEV 1 10 |grep -w "$1" > /tmp/sar.tmp
in=`grep "Average:" /tmp/sar.tmp|awk '{print $5}'|sed 's/\.//'`
out=`grep "Average:" /tmp/sar.tmp|awk '{print $6}'|sed 's/\.//'`

if [ $in == "00" ] && [ $out == "00" ]
then
    ifdown $1
    ifup $1
fi