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BASH IFS 环境变量用法总结 | LadyRick's idea #5

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utterances-bot opened this issue Dec 14, 2022 · 2 comments
Open

BASH IFS 环境变量用法总结 | LadyRick's idea #5

utterances-bot opened this issue Dec 14, 2022 · 2 comments

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BASH IFS 环境变量用法总结 | LadyRick's idea

之前从网上找了很多关于 IFS 的二手资料,每次用每次都得再看一遍,理解还是不够透彻。最近对照着 man bash ,终于把这个 IFS 搞清楚了。
IFS 的三种作用 IFS 其实只在 3 个地方发挥作用:
用于扩展带双引号的 "$*" 用于不带双引号的变量扩展 / 子命令扩展 / 算数扩展 用于在内建命令 read 中进行断词 可以看到,其实只有 bash 本身和 read 命

https://idea.ladyrick.com/posts/bash-ifs-%E7%8E%AF%E5%A2%83%E5%8F%98%E9%87%8F%E7%94%A8%E6%B3%95%E6%80%BB%E7%BB%93/

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