循环使用逗号分隔的shell变量 [英] Loop through a comma-separated shell variable

问题描述

假设我有一个如下的Unix shell变量

Suppose I have a Unix shell variable as below

variable=abc,def,ghij

我想使用for循环提取所有值(abc，def和ghij)，并将每个值传递给过程.

I want to extract all the values (abc, def and ghij) using a for loop and pass each value into a procedure.

该脚本应允许从$variable中提取任意数量的逗号分隔值.

The script should allow extracting arbitrary number of comma-separated values from $variable.

推荐答案

您可以使用以下脚本来动态遍历变量，无论变量有多少个字段(只要仅用逗号分隔即可).

You can use the following script to dynamically traverse through your variable, no matter how many fields it has as long as it is only comma separated.

variable=abc,def,ghij
for i in $(echo $variable | sed "s/,/ /g")
do
    # call your procedure/other scripts here below
    echo "$i"
done

代替上面的echo "$i"调用，可以在for循环内的do和done之间，调用过程proc "$i".

Instead of the echo "$i" call above, between the do and done inside the for loop, you can invoke your procedure proc "$i".

更新:如果变量的值不包含空格，则以上代码段均适用.如果您有这样的要求，请使用可以更改IFS的解决方案之一，然后解析您的变量.

Update: The above snippet works if the value of variable does not contain spaces. If you have such a requirement, please use one of the solutions that can change IFS and then parse your variable.

希望这会有所帮助.

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