在内存中创建一个临时文件并将其用作命令的输入文件 [英] creating a temporary file in memory and using it as input file of a command

问题描述

有一个命令pdflatex，我想在我的bash脚本中使用.它以文件名作为输入，它将在其上处理内容.

There is a command pdflatex, which I want to use in my bash script. It takes as input a filename on which content it will work.

现在我有一个算法，如下所示:

Now I have an algorithms that looks as follows:

for stuff in list of stuff; do
  echo "${stuff}" > /tmp/tmpStuff
  pdflatex /tmp/tmpStuff
done 

现在这可以按预期工作.但是我当时认为我可以通过减少磁盘I/O来加快速度(因为>重定向写入文件).我希望我可以写类似 echo"$ stuff" |pdflatex/tmp/tmpStuff ，但pdflatex使用文件而不是stdin作为输入.有什么方法可以将"$ stuff" 保留在内存中，并将其作为一种文件传递给pdflatex?

Now this works as expected. But I was thinking I could speed that up by doing less disk I/O(as > redirection writes to a file). I wish I could write something like echo "$stuff" | pdflatex /tmp/tmpStuff but pdflatex uses a file and not stdin as its input. Is there any way of keeping "$stuff" in memory and passing it to pdflatex as a sort of file?

TLDR:如果我可以创建一个可以命名并存在于内存中的临时文件，我会很高兴.

TLDR: I would be happy if I could create a temporary file which could be named and be in memory.

推荐答案

您可以为此使用进程替换:

You can use process substitution for this:

pdflatex <(echo "$stuff")

来自Bash参考手册:

From the Bash Reference Manual:

3.5.6流程替代

在支持命名管道的系统上支持进程替换(FIFO)或命名打开文件的/dev/fd方法.它采取的形式的

Process substitution is supported on systems that support named pipes (FIFOs) or the /dev/fd method of naming open files. It takes the form of

<(list)

或

>(list)

运行进程列表时，其输入或输出连接到FIFO或/dev/fd中的某个文件.作为扩展结果，此文件的名称作为参数传递给当前命令.如果使用>(list)形式，写入文件将为list提供输入.如果使用<(list)形式，则应读取作为参数传递的文件以获得list的输出.注意，<之间不能有空格.或>和左括号，否则该构造将被解释为重定向.

The process list is run with its input or output connected to a FIFO or some file in /dev/fd. The name of this file is passed as an argument to the current command as the result of the expansion. If the >(list) form is used, writing to the file will provide input for list. If the <(list) form is used, the file passed as an argument should be read to obtain the output of list. Note that no space may appear between the < or > and the left parenthesis, otherwise the construct would be interpreted as a redirection.

我还想知道这里的字符串是否也能做到:

And I also wonder if a here-string would make it as well:

pdflatex <<< "$stuff"

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