bash用变量值替换字符串中的变量名 [英] bash replace variable name in string with variable value

问题描述

这有点奇怪.我有以下字符串:

This is kind of a weird one. I have the following string:

我有一个名为 REDIRECT 的变量设置为:https://working.${MYDOMAIN}/blah/blah.

I have a variable called REDIRECT set to: https://working.${MYDOMAIN}/blah/blah.

我需要将 ${MYDOMAIN} 替换为分配给 ${MYDOMAIN} 的变量的实际值.不确定 bash 还是 sed 最适合这个.我试过 bash replace 但无法让它工作，可能与转义字符或其他东西有关.任何帮助表示赞赏！

I need to replace the ${MYDOMAIN} with the actual value of the variable assigned to ${MYDOMAIN}. Not sure if bash or sed is best for this. I tried bash replace but couldn't get it to work, probably related to escaping the characters or something. Any help appreciated!

推荐答案

你可以使用这个 bash 替换:

You may use this bash substitution:

echo "${REDIRECT/\${MYDOMAIN\}/$MYDOMAIN}"

否则，如果您有 envsubst 实用程序，请使用:

or else, if you have envsubst utility then use:

export MYDOMAIN
envsubst <<< "$REDIRECT"

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