windows 批处理文件 FOR /f 令牌
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Batch file FOR /f tokens
提问by Joey
Can anyone please explain exactly how the following code works, line by line. I'm really lost. I've been trying to learn how to use the FOR command but I don't understand this.
任何人都可以请逐行解释以下代码的工作原理。我真的很失落。我一直在尝试学习如何使用 FOR 命令，但我不明白这一点。
@echo off
for /f "tokens=* delims= " %%f in (myfile) do (
set line=%%f
call :processToken
)
goto :eof
:processToken
for /f "tokens=1* delims=/" %%a in ("%line%") do (
echo Got one token: %%a
set line=%%b
)
if not "%line%" == "" goto :processToken
goto :eof
回答by Joey
for /f "tokens=* delims= " %%f in (myfile) do
This reads a file line-by-line, removing leading spaces (thanks, jeb).
这会逐行读取文件，删除前导空格（谢谢，jeb）。
set line=%%f
sets then the linevariable to the line just read and
然后将line变量设置为刚刚读取的行并
call :procesToken
calls a subroutine that does something with the line
调用一个对线路做某事的子程序
:processToken
is the start of the subroutine mentioned above.
是上面提到的子程序的开始。
for /f "tokens=1* delims=/" %%a in ("%line%") do
will then split the line at /, but stopping tokenization after the first token.
然后将在 处拆分该行/，但在第一个标记之后停止标记化。
echo Got one token: %%a
will output that first token and
将输出第一个令牌和
set line=%%b
will set the linevariable to the rest of the line.
将line变量设置为行的其余部分。
if not "%line%" == "" goto :processToken
And if lineisn't yet empty (i.e. all tokens processed), it returns to the start, continuing with the rest of the line.
如果line还不是空的（即所有标记已处理），它返回到开始，继续该行的其余部分。
