多行文本文件，如何投入到环境变量 [英] Multiline text file, how to put into an environment variable
问题描述
我有一个名为file.txt的文件，其中包含：
i have a file called file.txt which contains:
this is line one ^
this is line two ^
this is the last line
我怎样才能把那个到的环境变量？
how can i put that into an env var?
我可以从一个批处理文件这样做：
test.bat的
i can do this from a batch file: test.bat
set LF=^
[blank line]
[blank line]
rem two blank lines needed above
set multi=Line 1!LF!Line 2!LF!Last line
echo !multi!
这个输出三行：
Line 1
Line 2
Last line
所以如何我可以将file.txt的一个ENVVAR批处理文件里面呢？
so how can i get file.txt into envvar inside a batch file?
推荐答案
由于dbenham说，可以也做FOR / F，但它更复杂一些。
As dbenham said, it can be done also with for/f but it's a bit more complicated.
简单的80％的溶液
setlocal EnableDelayedExpansion
set "var="
set LF=^
rem *** Two empty lines are required for the linefeed
FOR /F "delims=" %%a in (myFile.txt) do (
set "var=!var!!LF!%%a"
)
echo !var!
但它失败：结果
- 如果行是空将跳过结果
- 如果符合开始; 的EOL字符结果
- 如果一行包含 （插入记号和）
But it fails with:
- If a line is blank it will be skipped
- If a line begins with ; the EOL-character
- If a line contains ! (and carets)
不过，你可以用一个稍微复杂的解决方案。
But then you could use a bit more complex solution
@echo off
SETLOCAL DisableDelayedExpansion
set "all="
FOR /F "usebackq delims=" %%a in (`"findstr /n ^^ aux1.txt"`) do (
set "line=%%a"
SETLOCAL EnableDelayedExpansion
set "line=!line:#=#S!"
set "line=!line:*:=!"
for /F "delims=" %%p in ("!all!#L!line!") do (
ENDLOCAL
set "all=%%p"
)
)
SETLOCAL EnableDelayedExpansion
if defined all (
set "all=!all:~2!"
set ^"all=!all:#L=^
!"
set "all=!all:#S=#!"
)
echo !all!
在code做些什么？结果
首先， FINDSTR / N ^^ 将prePEND的行号和冒号，像
What the code do?
First, the findstr /n ^^ will prepend each line with a line number and a colon, like
1:My first Line
2:; beginning with a semicolon
3:
4:there was an empty line
这解决了空行，也是标准的EOL字符的问题; 可以忽略不计结果。
要得到行的内容，将值设置为一个变量，而延迟扩展被禁用，这解决了问题，！和 ^ 字符。
This solves the problem of empty lines and also the standard EOL-character ; can be ignored.
To get the content of the line, the value is set to a variable while delayed expansion is disabled, this solves the problem with ! and ^ characters.
要删除的行号和冒号，延迟扩展将被启用（不，一个DELIM ：解决不了）。
To remove the line number and the colon, the delayed expansion will be enabled (no, a delim of : can't solve it).
然后，所有＃被替换为 #S ，这将是第一次做，因为$ P $之后PFIX删除线可能是空的，替换将失败。结果
但为什么我更换呢？结果
这是因为我不能在这里插入换行，如下面的FOR / F将失败，并嵌入换行，结果
所以我只添加的换行标记的（在这种情况下，我用 #L ），但文件的内容也包含 #L ，而是通过替换所有＃与 #S 所有标记都是独一无二的。
Then all # are replaced with #S, this will be done first, as after the prefix removing the line could be empty and the replacement would fail.
But why I replace it?
That's because I can't insert the linefeeds here, as the following FOR/F would fail with embedded linefeeds,
so I only add linefeed marker (in this case I use #L), but the content of the file could contain also a #L, but by replacing all # with #S all markers are unique.
标记后，是关闭/禁止与 ENDLOCAL ，但preserve延迟扩展修改行变量。结果
这与 FOR / F-ENDLOCAL 的把戏，因为 %% P 可输送背后的内容<$完成C $ C> ENDLOCAL 屏障。
After the marker, there is the problem to close/disable the delayed expansion with an endlocal, but preserve the content of the modified all and line variable.
This is done with the FOR/F-endlocal trick, as the %%p can transport content behind the endlocal barrier.
然后读取完整的文件后，我检查所有的定义，因为这将是空的空文件。结果
然后第一个的换行标记的 #L 将被删除，而所有其他标记与真正的换行符替换。结果
那么犀利安全 #S 将恢复到＃。
Then after reading the complete file, I check if the all is defined, as it would be empty for an empty file.
Then the first linefeed marker #L will be removed, and all other markers are replaced with a real linefeed character.
Then the sharp safer #S will be reverted to #.
这就是全部，所以即使这个解决方案显然是...
That's all, so even this solution is obviously...
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