如何在灰中使用数组？

Question

出于某种原因，我无法使用 bash 构建我的脚本，唯一的方法是使用 ash，我有这个短信自动回复脚本，每个回复都必须最多 160 个字符长，它看起来像这样：

#!/bin/sh
    reply="this is a reply message that contains so many words so I have to split it to some parts"
    array="${reply:0:5} ${reply:5:5} ${reply:10:5} ${reply:15:5} ${reply:20:5}"
    for i in $array
    do
    echo "send sms with the message: $i"
    done

但结果是这样的：

send sms with the message: this
send sms with the message: is
send sms with the message: a
send sms with the message: reply
send sms with the message: mess
send sms with the message: age
send sms with the message: t

我想要的是这样的：

send sms with the message: this 
send sms with the message: is a 
send sms with the message: reply
send sms with the message: messa
send sms with the message: ge th
send sms with the message: at co
send sms with the message: ntain

所以它按字符数拆分而不是按单词拆分，我该怎么做？

Answer 1

您的数组实际上不是数组，但阅读 http://mywiki.wooledge.org/WordSplitting 了解更多信息。

ash 本身不支持数组，但您可以使用 set:

绕过它

reply="this is a reply message that contains so many words so I have to split it to some parts"
set -- "${reply:0:5}" "${reply:5:5}" "${reply:10:5}" "${reply:15:5}" "${reply:20:5}"
for i; do
        echo "send sms with the message: $i"
done

-

send sms with the message: this
send sms with the message: is a
send sms with the message: reply
send sms with the message:  mess
send sms with the message: age t

对此有许多替代解决方案，其中之一是使用 fold 为您完成拆分工作，其额外优势是它可以在空格处打断以使消息更具可读性（请参阅man fold 了解更多信息）：

reply="this is a reply message that contains so many words so I have to split it to some parts"
echo "${reply}" | fold -w 10 -s | while IFS= read -r i; do
        echo "send sms with the message: $i"
done

-

send sms with the message: this is a
send sms with the message: reply
send sms with the message: message
send sms with the message: that
send sms with the message: contains
send sms with the message: so many
send sms with the message: words so
send sms with the message: I have to
send sms with the message: split it
send sms with the message: to some
send sms with the message: parts

如何在灰中使用数组？

How to use array in ash?

ash