count.txt

https://tldp.org/HOWTO/Bash-Prog-Intro-HOWTO-7.html




https://stackoverflow.com/questions/13638670/adding-counter-in-shell-script
https://www.tutorialspoint.com/unix/if-elif-statement.htm
https://alvinalexander.com/linux-unix/linux-shell-script-counter-math-addition-loop/
$ cat count.sh
counter=0
while true; do
  if [ -f /home/script ]
  then
       echo "Files Present"
       exit 0
  elif [[ "$counter" -gt 5 ]]; then
       echo "Counter: $counter times reached; Exiting loop!"
       exit 1
  else
       counter=$((counter+1))
       echo "Counter: $counter time(s); Sleeping for another half an hour"
       sleep 3
  fi
done
#
# a shell script loop/counter example
# alvin alexander, http://alvinalexander.com
#
count=1
while [ $count -lt 200 ]
do
  filename="node${count}.shtml"
  echo "Redirect 301 /java/java_oo/${filename} http://www.devdaily.com/java/java_oo/"
  count=`expr $count + 1`
done


#!/bin/bash

urls="
https://www.baidu.com
https://www.taobao.com
https://www.jd.com/abc
https://www.12306.cn/index/
192.168.1.111
"
echo $urls

for url in $urls;do
    count=0
    while [ $count -lt 3 ];do
       STATUS=$(curl -I -m 10 -o /dev/null -s -w %{http_code} $url)

       if [ $STATUS -eq 200 ];then
          echo "$url  OK"
          break 1
       fi
       count=$(($count+1))
    done
    if [ $count -eq 3 ];then
       echo "$url Error"
    fi
done