獲取迭代的最后一行-UNIX

我創建了一個為配置的 IP 運行 nslookup 的簡單腳本。它將運行 10 次（按要求）以驗證它是否指向活動 IP，然后如果它回傳非活動，則通過電子郵件發送警報。

腳本運行良好，但是，當它發出警報時，由于回圈，它會執行 10 倍。如果它不滿足條件，我如何只得到最后一行，以便每個 IP 只發送一封電子郵件？

下面的代碼：

CDC="456.22." 
PDC="123.11" 
ACTIVE_DC=$CDC 
#ACTIVE_DC=$PDC 



#ADD/REMOVE VIRTUAL IPs HERE
vIP="app1.app.com app2.app.com"
[email protected]
subject="[TEST - - CRITICAL WARNING] NETWORK TRAFFIC POINTING TO INACTIVE DATA CENTER"
DATE=$(date ' %Y-%m-%d %H:%M:%S')

echo ""
echo "########################################################################"
echo "#################################START##################################"

for IP in $vIP; do
    echo""
    app_name=$(nslookup $IP | awk 'NR==4 {print NR,$0}' | cut -c 9-50) #Prints each VIP
    echo "$app_name"
        for i in {1..10}; do #Runs nslookup 10x for each VIP
            current=$(nslookup $IP | awk 'NR==5 {print NR,$0}' | cut -c 12-30)
            current2=$(echo "$current" | cut -c 1-6)
            echo "$current"
            if [[ "$current2" == "$ACTIVE_DC" ]]; then
                echo "Traffic is pointing to active DC"
            else
                echo "ERROR Traffic is pointing to INACTIVE DC"
                echo "$DATE - [TEST] CRITICAL - NETWORK TRAFFIC POINTING TO INACTIVE DATA CENTER
                CHECK $app_name
                TRAFFIC POINTING TO $current
                TRAFFIC SHOULD BE POINTING to $ACTIVE_DC ONLY!
                " | mailx -s "$subject" -r $MAIL_FROM [email protected]
            fi
        done
done
 

uj5u.com熱心網友回復：

修改后的腳本：

#!/bin/bash

CDC="456.22." 
PDC="123.11" 
ACTIVE_DC=$CDC 
#ACTIVE_DC=$PDC 

#ADD/REMOVE VIRTUAL IPs HERE
vIP="app1.app.com app2.app.com"
[email protected]
subject="[TEST - - CRITICAL WARNING] NETWORK TRAFFIC POINTING TO INACTIVE DATA CENTER"
DATE=$(date ' %Y-%m-%d %H:%M:%S')

echo ""
echo "########################################################################"
echo "#################################START##################################"

for IP in $vIP; do
    sendemail='false'
    echo ""
    app_name=$(nslookup "$IP" | awk 'NR==4 {print NR,$0}' | cut -c 9-50) #Prints each VIP
    echo "$app_name"
    
    for i in {1..10}; do #Runs nslookup 10x for each VIP
        current=$(nslookup "$IP" | awk 'NR==5 {print NR,$0}' | cut -c 12-30)
        current2=$(echo "$current" | cut -c 1-6)
        echo "$current"
        if [[ "$current2" == "$ACTIVE_DC" ]]; then
            echo "Traffic is pointing to active DC"
        else
            sendemail='true'
            echo "ERROR Traffic is pointing to INACTIVE DC"
            break
        fi
    done
    
    if [[ "$sendemail" == 'true' ]]
    then
        echo "$DATE - [TEST] CRITICAL - NETWORK TRAFFIC POINTING TO INACTIVE DATA CENTER
        CHECK $app_name
        TRAFFIC POINTING TO $current
        TRAFFIC SHOULD BE POINTING to $ACTIVE_DC ONLY!
        " | mailx -s "$subject" -r $MAIL_FROM [email protected]
    fi
done

我補充的是：

• 變數在 IP 地址sendemail的每個回圈開始時設定為 false 。for
• 如果出現錯誤，則必須發送電子郵件，因此將sendemail變數設定為 true 并break退出for i ...回圈。
• 如果sendemail是真的，請發送電子郵件。現在每個 IP 只會發生一次，因為電子郵件發送代碼在 nslookup 10X 回圈之外。

標籤：Unix

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