批处理：搜索字符串以跳过上面的行并将结果写入新文件

Question

我已经成功编写了一个脚本，该脚本接受一个字符串以在特定文件中搜索，然后输出它第一次出现的行，然后我将该值放入 for 循环并跳过解析该行数并将其内容写入新文件。但是我没有得到空白行，我觉得解决起来很困难。

我要搜索的字符串是“/]”，缓存它出现的行号，然后用逗号分隔将它累积到一个变量中。然后我再次将该变量放入for循环并检索第一个出现的值作为我的最终“跳过此行数”-变量，然后我在底部for循环中使用它再次读取该文件并将其值写入一个新文件，并在文件开头跳过该数量的行。

下面是我上面描述的脚本部分：

setlocal enabledelayedexpansion
setlocal enableextensions
set live_svn_access_file=c:\csvn\data\conf\svn_access_file
set of=c:\test.txt

for /f "Tokens=1 Delims=:" %%i in ('findstr /n /c:"/]" %live_svn_access_file%') do (
    rem cache value in a variable
    set line=%%i
    rem accumulate data to one variable
    if defined line set skip=!skip!, !line!
)
rem strip first two characters in variable ", "
set skip=!skip:~2!
rem strip everything except first value in array
for /f "Tokens=1 Delims=," %%i in ('echo !skip!') do (
    rem store value in a variable
    set skip=%%i
)
rem calculate lines - 1 (arithmetic)
set /a skip=!skip!-1
set skip=!skip!

if not defined skip set error=Could not automatically find which parts to skip from live svn_access_file && goto error-handler

for /f "Tokens=* Delims= Skip=%skip%" %%i in (%live_svn_access_file%) do (
    rem cache value in a variable
    set read-input=%%i
    rem write and append content of variable to output-file
    echo !read-input! >> %of%
)

我已经重写了脚本以匹配工作脚本，这是更改后的脚本：

setlocal enabledelayedexpansion
setlocal enableextensions
set live_svn_access_file=c:\csvn\data\conf\svn_access_file
set of=c:\test.txt

for /f "Tokens=1 Delims=:" %%i in ('findstr /n /r /c:"\[..*\]" %live_svn_access_file%') do (
    rem cache value in a variable
    set line=%%i
    rem accumulate data to one variable
    if defined line set skip=!skip!, !line!
)
rem take the 2nd sections linenumber into a variable, skipping the first [*foo*]
for /f "Tokens=2 Delims=," %%i in ('"echo !skip!"') do (
    rem store value in a variable
    set skip=%%i
)
rem add 1 line to skip from retrieved value
set /a skip=!skip!-1

rem verify that number of lines to skip has been successfully retrieved, if not go to error-handler
if not defined skip set error=Could not automatically find which parts to skip from live svn_access_file && goto error-handler
if ["%skip%"] LSS ["1"] set error=Number of lines to skip was less than 1, this will most likely fail && goto error-handler

rem read live svn_access_file, but skip X-lines and write to output-file
setlocal DisableDelayedExpansion
for /f "usebackq Delims= Skip=%skip%" %%i in (`"findstr /n ^^ %live_svn_access_file%"`) do (
    rem cache value in a variable
    set read-input=%%i
    rem write and append content of variable to output-file
    setlocal EnableDelayedExpansion
    rem strip line number prefix
    set read-input=!read-input:*:=!
    rem write read lines to output-file
    echo(!read-input!>>%of%
    endlocal
)

Answer 1

您有两个主要问题，一个 FOR /F 无法读取空行（正如您发现的那样），如果您使用延迟扩展，您会遇到set read-input=%%i 行中的感叹号和插入符号的问题。

您可以解决这两个问题，即使用 findstr 在每行前加上行号的空行。 第二个是延迟切换技术。

SETLOCAL DisableDelayedExpansion
FOR /F "usebackq delims=" %%a in (`"findstr /n ^^ t.txt"`) do (
    set "var=%%a"
    SETLOCAL EnableDelayedExpansion
    set "var=!var:*:=!" This removes the prefix
    echo(!var!
    ENDLOCAL
)