@echo off 的意思

echo 文件

echo [on|off] 可用來開關命令回應 (command echoing) 功能。預設值為 on。

echo on

echo 功能預設為開啟。意思是每個命令的輸入都會顯示在終端機上。

echo on
echo This is Line 1
echo This is Line 2
echo This is Line 3
pause

D:\Projects\Test>echo on

D:\Projects\Test>echo This is Line 1
This is Line 1

D:\Projects\Test>echo This is Line 2
This is Line 2

D:\Projects\Test>echo This is Line 3
This is Line 3

D:\Projects\Test>pause
請按任意鍵繼續 . . .

echo off

echo 功能關閉後，命令的輸入就不會再顯示了。但是以下範例第一行的 echo off 在執行的當下，因為還沒關掉，所以這一行仍會顯示。

echo off
echo This is Line 1
echo This is Line 2
echo This is Line 3
pause

D:\Projects\Test>echo off
This is Line 1
This is Line 2
This is Line 3
請按任意鍵繼續 . . .

@echo off

根據文件，我們知道 @ 是個專門只關閉單行 echo 的特殊字元。 所以如果要連帶第一行的 echo off 的回應一起消失，要在前面加上 @，改寫成 @echo off。

To prevent echoing a particular command in a batch file, insert an (@) sign in front of the command. To prevent echoing all commands in a batch file, include the echo off command at the beginning of the file.

@echo off
echo This is Line 1
echo This is Line 2
echo This is Line 3
pause

This is Line 1
This is Line 2
This is Line 3
請按任意鍵繼續 . . .