bash replace variable name in string with variable value

问题

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

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

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!

回答1:

You may use this bash substitution:

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

or else, if you have envsubst utility then use:

export MYDOMAIN
envsubst <<< "$REDIRECT"

回答2:

Just execute in bash:

eval REDIRECT=$REDIRECT

来源：https://stackoverflow.com/questions/61510099/bash-replace-variable-name-in-string-with-variable-value