巴什逃避空格的文件名，变量 [英] Bash escaping spaces in filename, in variable

问题描述

我很新来砸所以这可能是一些小事，但我只是没有得到它。我试图逃跑内部文件名的空间。看一看。请注意，这是一个工作的例子' - 我得到的交织与空白页的文件可能会实现比较容易，但我在这里关于空间

I'm quite new to Bash so this might be something trivial, but I'm just not getting it. I'm trying to escape the spaces inside filenames. Have a look. Note that this is a 'working example' - I get that interleaving files with blank pages might be accomplished easier, but I'm here about the space.

#! /bin/sh

first=true
i=combined.pdf
o=combined2.pdf
for f in test/*.pdf
do
    if $first; then
        first=false
        ifile=\"$f\"
    else
        ifile=$i\ \"$f\"
    fi
    pdftk $ifile blank.pdf cat output $o
    t=$i
    i=$o
    o=$t
    break
done

说我有一个名为我file.pdf 文件（中间有空格）。我想用ifile变量包含字符串 combined.pdf我file.pdf，这样PDFTK是能够使用它作为两个文件的参数 - 第一个是 combined.pdf ，和第二个是我file.pdf 。

Say I have a file called my file.pdf (with a space). I want the ifile variable to contain the string combined.pdf "my file.pdf", such that pdftk is able to use it as two file arguments - the first one being combined.pdf, and the second being my file.pdf.

我试过逃跑（带或不带先逃离自己的报价等）的各种方法，但它一直劈我的和 file.pdf 执行PDFTK时。

I've tried various ways of escaping (with or without first escaping the quotes themselves, etc.), but it keeps splitting my and file.pdf when executing pdftk.

编辑：为了澄清：我想在一个变量传递多个文件名（如多个参数）将PDFTK命令。我想它识别两个文件名之间的差别，而不是在空间撕裂一个文件名。

To clarify: I'm trying to pass multiple file names (as multiple arguments) in one variable to the pdftk command. I would like it to recognise the difference between two file names, but not tear one file name apart at the spaces.

推荐答案

把多个参数到一个单一变量就没有意义了。相反，把它们放到一个数组：

Putting multiple arguments into a single variable doesn't make sense. Instead, put them into an array:

args=(combined.pdf "my file.pdf");

注意我的file.pdf是引用到preserve空白。

Notice that "my file.pdf" is quoted to preserve whitespace.

您可以使用数组是这样的：

You can use the array like this:

pdftk "${args[@]}" ...

这将通过两个独立的参数 PDFTK 。在报价$ {ARGS [@]}是必需的，因为他们告诉shell将每个数组元素视为一个单独的字（即不拆数组元素，即使它们包含空格）。

This will pass two separate arguments to pdftk. The quotes in "${args[@]}" are required because they tell the shell to treat each array element as a separate "word" (i.e. do not split array elements, even if they contain whitespace).

作为一个方面说明，如果你使用庆典如数组主义，你的家当改为

As a side note, if you use bashisms like arrays, change your shebang to

#!/bin/bash

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