批处理：如何将命令的输出重定向到文件

Question

ping google.com >> ping.txt

that dosent work if i put it in a batch file and run the file

this is the output of ping.txt:

C:\Users\User\Desktop>ping google.com  1>>ping.txt  
C:\Users\User\Desktop>ping google.com  1>>ping.txt  
. 
. 
.

Answer 1

You're doing something strange with pipes.

This (from command line) will append the ping result to ping.txt file.

ping www.google.com >> ping.txt

Now create a batch file ( testping.bat , for example) and put the same line inside it. If you run the batch file with following command you'll get the same result.

testping

If you redirect the output of the batch itself then what you'll get is the echo of the batch file commands! This is why this will not work as expected:

testping >> ping.txt