Write a simple shell script-For loop-Resolve error Syntax Error:bad for loop variable

To write a program that imports data in batches, learn to write shell scripts! Now learn to use!

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1, the first simple for loop

#!/bin/bash
For I in 1 2 3 4;
Do
echo $i;
Done

2. Test for self-growing loops:

#!/bin/bash
for ((I=1; i<=5; i++)
Do
echo $i;
Done

If there is an error, no then skip:

Syntax Error:bad for loop variable

Reason: The code is not wrong for standard bash, because Ubuntu is doing the same with dash instead of the traditional bash in order to speed up the boot.

Workaround: Cancel Dash

Dpkg-reconfigure Dash

A bullet box appears, select No

Refer to the original details to resolve the error:

http://blog.csdn.net/yf210yf/article/details/9206185

3, Actual combat: Batch Import data

#!/bin/bash
for ((I=1; i<=1000; i++)
Do
Echo ' Curl http://localhost/test.php?page= $i & ';
Done

With echo you can see the output, and the output of "add-end-0" for my test.php program runs out once

Write a simple shell script-For loop-Resolve error Syntax Error:bad for loop variable