在spawn中使用两个命令(使用pipe |) [英] Using two commands (using pipe |) with spawn

问题描述

我正在将内存中的doc转换为pdf(unoconv)，并在终端中使用以下命令打印(pdftotext):

I'm converting a doc to a pdf (unoconv) in memory and printing (pdftotext) in the terminal with:

unoconv -f pdf --stdout sample.doc | pdftotext -layout -enc UTF-8 - out.txt

正在工作.现在我想将此命令与child_process.spawn一起使用:

Is working. Now i want use this command with child_process.spawn:

let filePath = "...",
process = child_process.spawn("unoconv", [
  "-f",
  "pdf",
  "--stdout",
  filePath,
  "|",
  "pdftotext",
  "-layout",
  "-enc",
  "UTF-8",
  "-",
  "-"
]);

在这种情况下，只有第一个命令(在|之前)有效.我可以做我想做的事吗?

In this case, only the first command (before the |) is working. Is i possible to do what i'm trying?

谢谢.

更新-

结果:sh -c- ....

bash-3.2$ sh -c- unoconv -f pdf --stdout /Users/fatimaalves/DEV/xx/_input/sample.doc | pdftotext -layout -enc UTF-8 - -
sh: --: invalid option
Usage:  sh [GNU long option] [option] ...
    sh [GNU long option] [option] script-file ...
GNU long options:
    --debug
    --debugger
    --dump-po-strings
    --dump-strings
    --help
    --init-file
    --login
    --noediting
    --noprofile
    --norc
    --posix
    --protected
    --rcfile
    --restricted
    --verbose
    --version
    --wordexp
Shell options:
    -irsD or -c command or -O shopt_option      (invocation only)
    -abefhkmnptuvxBCHP or -o option
Syntax Warning: May not be a PDF file (continuing anyway)
Syntax Error: Couldn't find trailer dictionary
Syntax Error: Couldn't find trailer dictionary
Syntax Error: Couldn't read xref table

推荐答案

如果您不想使用上述的sh命令，则必须创建多个child_process.spawn实例，然后像使用管道一样将它们相互连接所以:

If you don't want to use the sh command as explained above, you must create multiple child_process.spawn instances and then pipe them into each other like so:

const getModule = spawn('curl', [url, '-ks']);
const unTar = spawn('tar', ['-xvz', '-C', fileName, '--strip-components', 1]);
getModule.stdout.pipe(unTar.stdin);

理论上，以上代码将从url中检索tar，并将其解压缩到目录fileName

The above code theoretically will retrieve a tar from url, and unpack into a directory fileName

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