bash - 使用 WGET 模拟 Web 事件

Question

我目前正在编写一个 Bash 脚本来模拟 Web 事件。这个想法是脚本运行大约三个小时，然后终止。

我对 wget 没问题，oneliner 在 cmd 行上工作得很好 代码在这里:

#!/bin/bash

a=$(date +%s)
echo current time is $a
b=$(($a + 10800))   # finish time is start time plus 10800 number of seco\
                # nds in three hours
echo finish time is $b
for line in "url_list.txt"; do
     echo current url is $line
     date=$(date +%s)
     echo current time is $c
     wget -e \
       -r -p -l 1 -T 60 \
       --random-wait --user-agent="Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.3) Gecko/2008092416 Firefox/3.0.3" \
       --convert-links\
     echo "downloading..." 
     echo "Calculating if three hours has passed..."
     if (("$date" > "$b"))
     then
         echo "3 hours has passed£
         break
     else
         echo sleep for 5 seconds
         sleep 5;
     done;

我收到错误:

url_request.sh: line 26: syntax error near unexpected token `done'
url_request.sh: line 26: `      done'

发生了什么事，我看不到？

Answer 1

在 bash 中，您以 fi 结束 if 结构，而不是 done