为什么我的 bash 没有提示更新？

我是 git 的新手，我尝试将当前的 git 分支添加到已经存在的提示符中，定义如下:

RESET="\[\017\]"
NORMAL="\[\033[0m\]"
RED="\[\033[31;1m\]"
YELLOW="\[\033[33;1m\]"
WHITE="\[\033[37;1m\]"
SMILEY="${WHITE}:)${NORMAL}"
FROWNY="${RED}:(${NORMAL}"
SELECT="if [ \$? = 0 ]; then echo \"${SMILEY}\"; else echo \"${FROWNY}\"; fi"


export PS1="${RESET}${YELLOW}\u@\h${NORMAL} \`${SELECT}\` ${YELLOW}\w $(__git_ps1) >${NORMAL} "

我尝试了它(通过源我的 .bashrc文件再次) ，它似乎工作，但后来我去了另一个分支，它没有更新。如何确保 $(__git_ps1)没有被缓存？

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Your PS1 string is probably getting evaluated before it is getting saved, but you really want the __git_ps1 command to run each time you get a command prompt. I'd recommend using single quotes instead of double quotes for your export PS1='${RESET}...' line.

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最佳答案

You need a backslash on the $ so it isn't expanded immediately. (Compare to the `...`, which is a different way of writing $(...).)

export PS1="${RESET}${YELLOW}\u@\h${NORMAL} \`${SELECT}\` ${YELLOW}\w \$(__git_ps1) >${NORMAL} "

I would agree with @MikeSep about using single quotes, but it's actually a bit more optimal to let the colors and such be substituted immediately. Not necessary, just somewhat better. That said, it is easier to understand what's going on if you use the single quotes.


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