shell document given syntax error near unexpected token '$' \ r ''

Originally run was a good document, amended in the windows, and then ported to linux on the error.
Looking for a lap Here are solutions:

The reason this happens is because your file is processed line breaks dos format "\ r \ n"
You can use cat -v filename to see if a line break is, if it is above, it would be the end of the line ^ m
need to convert linux / unix format "\ n"
specific conversion is line feed conversion procedures
can be handled at the file with sed command, the command is as follows:
sed 'S / \ R & lt //' after the original file> file conversion

 

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Check the shell syntax

[root@iZm5ed2begvgw01qrymv8yZ Data]# bash -n task_start.sh 
task_start.sh: line 4: syntax error near unexpected token `$'do\r''
'ask_start.sh: line 4: `do
[root@iZm5ed2begvgw01qrymv8yZ Data]# 

I have found that there is no execution

[root@iZm5ed2begvgw01qrymv8yZ Data]# sed 's/\r//g' task_start.sh > task_start.sh 
[root@iZm5ed2begvgw01qrymv8yZ Data]# 
[root@iZm5ed2begvgw01qrymv8yZ Data]# 
[root@iZm5ed2begvgw01qrymv8yZ Data]# 
[root@iZm5ed2begvgw01qrymv8yZ Data]# [root@iZm5ed2begvgw01qrymv8yZ Data]# cat task_start.sh -v [root@iZm5ed2begvgw01qrymv8yZ Data]# cat task_start.sh 

The reason
???

solve

[root@iZm5ed2begvgw01qrymv8yZ Data]# sed 's/\r//g' task_start.sh > task_start2.sh 
[root@iZm5ed2begvgw01qrymv8yZ Data]# 
[root@iZm5ed2begvgw01qrymv8yZ Data]# 
[root@iZm5ed2begvgw01qrymv8yZ Data]# cat task_start2.sh 
#!/usr/bin/env bash task_url=("http://hs.oeynet.com/task.php" "http://hs.oeynet.com/task.php") for n in `seq 10` do for task in ${task_url[*]} do curl $task >> /www/server/logs/task.log done sleep 6 done [root@iZm5ed2begvgw01qrymv8yZ Data]# cat task_start2.sh -v