是否有一种简单且性能良好的方式来并行读取两个(或更多)文本文件？所以要有一个循环，在每次迭代中读取每个文本文件的一行。
不能使用给定多个文件的 for/F 循环，因为它会一个接一个地读取文件。嵌套这样的循环当然也没有意义。
最佳答案
诀窍是使用STDIN redirection < (另见 this site )使用未定义的句柄( 3 到 9 )用于文件读取的整个代码块，命令 set /P在 block 中实际读取一行和 0<&为 set /P 将未定义的句柄重定向回 STDIN , 因此要读取相应的行。
这是它如何工作的一个例子:
假设有以下两个文本文件names.txt ...:
Black Blue Green Aqua Red Purple Yellow White Grey Brown
...和values.txt ...:
0 1 2 3 4 5 6 7
...目标是将它们逐行组合以实现此文件，names=values.txt ...:
Black=0 Blue=1 Green=2 Aqua=3 Red=4 Purple=5 Yellow=6 White=7
...以下代码实现了这一点(请参阅所有解释性注释，rem):
@echo off
setlocal EnableExtensions EnableDelayedExpansion
rem // Define constants here:
set "FILE1=names.txt"
set "FILE2=values.txt"
set "RET=names=values.txt" & rem // (none to output to console)
if not defined RET set "RET=con"
rem /* Count number of lines of 1st file (2nd file is not checked);
rem this is necessary to know when to stop reading: */
for /F %%C in ('^< "%FILE1%" find /C /V ""') do set "NUM1=%%C"
rem /* Here input redirection is used, each file gets its individual
rem (undefined) handle (that is not used by the system) which is later
rem redirected to handle `0`, `STDIN`, in the parenthesised block;
rem so the 1st file data stream is redirected to handle `4` and the
rem 2nd file to handle `3`; within the block, as soon as a line is read
rem by `set /P` from a data stream, the respective handle is redirected
rem back to `0`, `STDIN`, where `set /P` expects its input data: */
4< "%FILE1%" 3< "%FILE2%" > "%RET%" (
rem // Loop through the number of lines of the 1st file:
for /L %%I in (1,1,%NUM1%) do (
set "LINE1=" & rem /* (clear variable to maintain empty lines;
rem `set /P` does not change variable value
rem in case nothing is entered/redirected) */
rem // Change handle of 1st file back to `STDIN` and read line:
0<&4 set /P "LINE1="
set "LINE2=" & rem // (clear variable to maintain empty lines)
rem // Change handle of 2nd file back to `STDIN` and read line:
0<&3 set /P "LINE2="
rem /* Return combined pair of lines (only if line of 2nd file is
rem not empty as `set /P` sets `ErrorLevel` on empty input): */
if not ErrorLevel 1 echo(!LINE1!=!LINE2!
)
)
endlocal
exit /B
关于windows - 批处理文件如何并行读取两个文本文件？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/38214874/