申报，排版和局部变量在Bash中之间的差异 [英] Differences between declare, typeset and local variable in Bash

问题描述

在Bash中输入变量，就是之间的差别声明和排版？当一个函数内部使用的：是什么之间的差别声明和排版和本地？

When typing variables in Bash, what is the difference between declare and typeset? When used inside a function: what is the difference between declare and typeset and local?

我所遇到的唯一的区别是，排版移植到的ksh脚本。除此之外，还有为什么要成为pferred比其他$ P $的原因是什么？

The only difference I have come across is that typeset is portable to ksh scripts. Other than that, are there any reasons why one should be preferred over the other?

更新：新增本地来的问题。

推荐答案

• 的差异排版和声明：

• Difference between typeset and declare:

前者更便于携带（例如KSH），而后者更preferable时，便携性不是一个问题。

The former is more portable(e.g. ksh), while the latter is more preferable when portability is not a concern.



• 之间的差异声明（或排版）和本地函数内使用时：


• Difference between declare(or typeset) and local when used inside a function:

前者指的是后者，但功能更强大。例如，声明-ix 使 X 有整数属性，声明-rx ，使 X 只读等。

The former implies the latter, but more powerful. For example, declare -i x makes x have the integer attribute, declare -r x makes x readonly, etc.

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