Question

请在下面找到简化的bash脚本parseArg.sh：-

#!/usr/bin/env bash

function parse(){

    local propsFile=$1


    echo "search file is : >$propsFile<"

    while IFS='=' read -r packageKey packageValue;
    do


        echo "package value is >$packageValue<"

        packageProcessor $packageValue

        echo "---------------------------------------------------------"
    done < "$propsFile"
}

function packageProcessor(){
    echo "Total args : $#"
    echo "All args value : >$@<"
    for arg in "$@"
    do
        echo "$arg"
    done
}

$@

以下是同一目录中的配置文件repos.conf：-

cm5-centos6.6="https://archive.cloudera.com/cm5/redhat/6/x86_64/cm/5/ cm5-centos6.6 cm5/centos6.6 cm5/centos6.6 cm5-centos_6_6 "Cdh 5 for CentOS 6.6""

当我在同一目录中执行以下命令时：-

sh parseArg.sh解析repos.conf

我原本希望有6个参数，但是总共有10个参数。以下是实际输出：-

search file is : >repos.conf<
package value is >"https://archive.cloudera.com/cm5/redhat/6/x86_64/cm/5/ cm5-centos6.6 cm5/centos6.6 cm5/centos6.6 cm5-centos_6_6 "Cdh 5 for CentOS 6.6""<
Total args : 10
All args value : >"https://archive.cloudera.com/cm5/redhat/6/x86_64/cm/5/ cm5-centos6.6 cm5/centos6.6 cm5/centos6.6 cm5-centos_6_6 "Cdh 5 for CentOS 6.6""<
"https://archive.cloudera.com/cm5/redhat/6/x86_64/cm/5/
cm5-centos6.6
cm5/centos6.6
cm5/centos6.6
cm5-centos_6_6
"Cdh
5
for
CentOS
6.6""
---------------------------------------------------------

Answer 1

在parse函数中，变量packageValue将包含一个值如下的字符串：

"https://archive.cloudera.com/cm5/redhat/6/x86_64/cm/5/ cm5-centos6.6 cm5/centos6.6 cm5/centos6.6 cm5-centos_6_6 "Cdh 5 for CentOS 6.6""

该变量的值中包含前导和尾随引号。该字符串中的引号是普通字符。

将其解析为6个单独组件的唯一可行方法是使用eval强制外壳程序遵守“内部”引号。首先，您必须删除开头和结尾的引号：

    tmp=${packageValue#\"}
    packageValue=${tmp%\"}
    packageProcessor "$packageValue"

然后，在packageProcessor函数中，您将必须使用eval将字符串分配为数组，但是您需要暂时禁用文件名生成：您想利用分词，但不受路径扩展的影响。

set -f
eval "elements=($1)"
set +f

现在您可以

declare -p elements
for arg in "${elements[@]}"; do echo "$arg"; done

说了这么多，就不要做。这本质上是不安全的。使用不会将您暴露给eval的不安全调用而只是分割数据的数据存储格式。

如果您完全可以控制该配置文件的内容，请使用Shell语法使其成为您可以获取的脚本：

declare -a cm5_centos_6_6=(https://archive.cloudera.com/cm5/redhat/6/x86_64/cm/5/ cm5-centos6.6 cm5/centos6.6 cm5/centos6.6 cm5-centos_6_6 "Cdh 5 for CentOS 6.6")

用bash解析带有多个单词的参数

1 个答案: