[文本处理] [已解决]批处理如何将文本每两行合并为一行输出到新的文本里？

ams

文本如下

aaaaaaaa
bbbbbbbb
cccccccccc
dddddddd
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请教如何变成如下

aaaaaaaa bbbbbbbb
cccccccccc dddddddd
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判断时不能写死数字，例子的4行内容为示范，真实文本行数不固定

gawk

sed "$!N;s/\n/ /" 1.txt > 2.txt
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gawk

gawk "NR%2{printf $0\" \";next}1"  1.txt > 2.txt
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gawk

@echo off
set "MergeRows=2"
(for /f  %%a in (1.txt) do (
    set /a n+=1
    set /a m=n%%%MergeRows%
    set /p=%%a <nul
    set /a test=1/m 2>nul || echo;
))>2.txt
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pcl_test

@echo off
(for /f "delims=" %%a in ('type "a.txt"') do (
    if not defined n (set/p"=%%a "&set n=1) else (echo;%%a&set n=)
))<nul>"b.txt"
pause
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ams

感谢gawk和pcl_test