[ Bash 範例代碼 ] Check remote server connectivity

 Source From Here

- 02-1_ping_server.sh

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1. #!/bin/bash  
2. # Author: John Lee  
3. # Date: 2021/07/24  
4. # Description: This script will ping a remote host  
5. # Modified: 2021/07/24  
6.   
7. HOST=${HOST:-localhost}  
8. ping -c1 ${HOST} &> /dev/null  
9. if [ $? -eq 0 ]; then  
10.   echo $HOST ok  
11. else  
12.   echo $HOST NOT ok!  
13. fi  

Execution output:

# export HOST=8.8.8.8 && ./02-1_ping_server.sh
8.8.8.8 ok

# export HOST=8.8.8.9 && ./02-1_ping_server.sh
8.8.8.9 NOT ok!

- 02-2_ping_servers.sh

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1. #!/bin/bash  
2. # Author: John Lee  
3. # Date: 2021/07/24  
4. # Description: This script will ping multiple hosts given in  
5. #   a file declared in variable `IP_LIST_FILE`  
6. # Modified: 2021/07/24  
7. function ping_host {  
8.   ping -c1 $1 &> /dev/null  
9.   if [ $? -eq 0 ]; then  
10.     echo $1 ok  
11.   else  
12.     echo $1 NOT ok!  
13.   fi  
14. }  
15.   
16. IP_LIST_FILE=${IP_LIST_FILE:-"ip_list_file"}  
17. if [ -f ${IP_LIST_FILE} ]; then  
18.   for ip in $(cat $IP_LIST_FILE)  
19.   do  
20.     ping_host $ip  
21.   done  
22. else  
23.   echo "File $IP_LIST_FILE not exist!"  
24.   exit 1  
25. fi  

Execution output:

# cat ip_list_file
8.8.8.8
168.95.1.1

# unset IP_LIST_FILE
# ./02-2_ping_servers.sh
8.8.8.8 ok
168.95.1.1 ok

# export IP_LIST_FILE='not_exist' && ./02-2_ping_servers.sh
File not_exist not exist!