[[ $- = *i* ]] 在 bash 中是什么意思？
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What does [[ $- = *i* ]] mean in bash?
提问by Cyril ALFARO
I'm installing liquidpromptand in the documentation they ask you to add [[ $- = *i* ]] && source ~/liquidprompt/liquidpromptin your .bashrc.
我安装liquidprompt及文档中他们要求你添加[[ $- = *i* ]] && source ~/liquidprompt/liquidprompt在你的.bashrc。
I am trying to understand the first part of the line but it's hard for a noob in bash like me. If anyone has a nice doc or the answer...
我试图理解该行的第一部分，但对于像我这样的 bash 菜鸟来说很难。如果有人有好的文档或答案...
回答by choroba
$-contains the current shell options.
$-包含当前的 shell 选项。
In [[ ... ]], the right hand side of a =is interpreted as a pattern if not quoted. Therefore, *i*means ipossibly preceded or followed by anything.
在 中[[ ... ]]，=如果没有引用，a 的右侧将被解释为模式。因此，*i*意味着i可能在任何事物之前或之后。
In other words, it checks wheter the ioption is present, i.e. whether the current shell is interactive.
换句话说，它检查i选项是否存在，即当前shell 是否是交互式的。
回答by 123
It is checking whether the options for the shell $-contains an iin them. The iis for interactive
它正在检查 shell 的选项中是否$-包含一个i。该i是互动
From the Bash man page:
从Bash 手册页：
An interactive shell is one started without non-option arguments and without the -c option whose standard input and error are both connected to terminals (as determined by isatty(3)), or one started with the -i option. PS1 is set and $- includes i if bash is interactive, allowing a shell script or a startup file to test this state.
交互式 shell 是在没有非选项参数和 -c 选项的情况下启动的，其标准输入和错误都连接到终端（由 isatty(3) 确定），或者是使用 -i 选项启动的。PS1 已设置，如果 bash 是交互式的，则 $- 包括 i，允许 shell 脚本或启动文件来测试此状态。
