[文本处理] 批处理命令findstr和find处理最大长度上限几例

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测试环境

Win7: 6.1.7601
Win10: 10.0.19045.3570
Win11: 10.0.22621.2283

@echo off
REM 生成单行超长的文本文件

echo "en8190.txt"
(for /l %%i in (1,1,8190) do (
    set /p =A<nul
))>"en8190.txt"
echo,>>"en8190.txt"

echo "en8191.txt"
(for /l %%i in (1,1,8191) do (
    set /p =A<nul
))>"en8191.txt"
echo,>>"en8191.txt"

echo "en1000000.txt"
(for /l %%i in (1,1,1000000) do (
    set /p =A<nul
))>"en1000000.txt"
echo,>>"en1000000.txt"

echo "cn4095.txt"
(for /l %%i in (1,1,4095) do (
    set /p =中<nul
))>"cn4095.txt"
echo,>>"cn4095.txt"

echo "cn4096.txt"
(for /l %%i in (1,1,4096) do (
    set /p =中<nul
))>"cn4096.txt"
echo,>>"cn4096.txt"

echo "cn1000000.txt"
(for /l %%i in (1,1,1000000) do (
    set /p =中<nul
))>"cn1000000.txt"
echo,>>"cn1000000.txt"
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ShowCode

以下测试假设文本行尾都带有回车换行。文本行尾不带回车换行的情况，得出的结果会略有差异。

REM findstr通过输入重定向输入获取数据，可以处理的单行最大长度为：
REM 8190个英文或数字
REM 4095个中文
REM Win11系统上限未知
findstr "A" < en8190.txt > en8190-s1.txt
findstr "A" < en8191.txt > en8191-s1.txt
findstr "中" < cn4095.txt > cn4095-s1.txt
findstr "中" < cn4096.txt > cn4096-s1.txt
REM 超出之后的报错信息为：FINDSTR: 行 1 太长。


REM findstr通过管道获取数据，可以处理的单行最大长度为：
REM 8190个单字节字符（英文或数字）
REM 4095个双字节字符（中文）
REM Win11系统上限未知
type en8190.txt | findstr "A" > en8190-s2.txt
type en8191.txt | findstr "A" > en8191-s2.txt
type cn4095.txt | findstr "中" > cn4095-s2.txt
type cn4096.txt | findstr "中" > cn4096-s2.txt
REM 超出之后的报错信息为：FINDSTR: 行 1 太长。

REM findstr直接从文件获取数据，尝试处理单行1000000的情况正常，不确定上限是多少
findstr "A" en1000000.txt > en1000000-s0.txt
findstr "中" cn1000000.txt > cn1000000-s0.txt

REM find通过输入重定向输入获取数据，输出结果被截断至：
REM 4095个单字节字符（英文或数字）
REM 4095个双字节字符（中文）
find "A" < en1000000.txt > en1000000-f1.txt
find "中" < cn1000000.txt > cn1000000-f1.txt

find "A" < en8190.txt > en8190-f1.txt
find "中" < cn4096.txt > cn4096-f1.txt

REM find通过管道获取数据，输出结果被截断至：
REM 4095个单字节字符（英文或数字）
REM 4095个双字节字符（中文）
type en1000000.txt | find "A" > en1000000-f2.txt
type cn1000000.txt | find "中" > cn1000000-f2.txt

type en8190.txt | find "A" > en8190-f2.txt
type cn4096.txt | find "中" > cn4096-f2.txt

find "A" < en8190.txt > en8190-f1.txt
find "中" < cn4096.txt > cn4096-f1.txt

REM find直接从文件获取数据，输出结果被截断至：
REM 4095个单字节字符（英文或数字）
REM 4095个双字节字符（中文）
find "A" en1000000.txt > en1000000-f0.txt
find "中" cn1000000.txt > cn1000000-f0.txt

find "A" en8190.txt > en8190-f0.txt
find "中" cn4096.txt > cn4096-f0.txt

REM findstr单个待查找关键字的最大长度为：
REM 255个单字节字符（英文或数字）
REM 127个双字节字符（中文）
findstr "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA" en8191.txt > en8191-s-p1.txt
findstr "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA" en8191.txt > en8191-s-p2.txt
findstr "中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中" cn4095.txt > cn4095-s-p1.txt
findstr "中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中中" cn4095.txt > cn4095-s-p2.txt
REM 超出之后的报错信息为：FINDSTR: 内存不足

REM find单个待查找关键字的最大长度为：未知
REM 只要整个命令不超过单行命令最大值8190即可
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Five66

win11这么强的？？？