bash replace variable name in string with variable value

Question

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!

This looks like a XY problem, is it?

Quasímodo
– Quasímodo

2020-04-29 20:07:47 +00:00
Commented Apr 29, 2020 at 20:07 — Quasímodo
– Quasímodo, Commented Apr 29, 2020 at 20:07

anubhava · Accepted Answer · 2020-04-29 19:45:45Z

3

You may use this bash substitution:

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

or else, if you have envsubst utility then use:

export MYDOMAIN
envsubst <<< "$REDIRECT"

answered Apr 29, 2020 at 19:45

anubhava

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Pierre François · Accepted Answer · 2020-04-29 19:48:14Z

0

Just execute in bash:

eval REDIRECT=$REDIRECT

answered Apr 29, 2020 at 19:48

Pierre François

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2 Comments

Quasímodo Over a year ago

And let's pray that this eval won't fall in the wrong hands. Well, much better not to trust it.

Gordon Davisson Over a year ago

eval tends to be unpredictable and unsafe unless you have good control over the data being evaluated. For example, does your URL have any & characters (i.e. multiple parameters) in it? If so, that'll be treated as a delimiter between separate shell commands rather than just part of a string.

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