How to use variables in a command in sed?

I have abc.sh:

exec $ROOT/Subsystem/xyz.sh

On a Unix box, if I print echo $HOME then I get /HOME/COM/FILE.

I want to replace $ROOT with $HOME using sed.

Expected Output:

exec /HOME/COM/FILE/Subsystem/xyz.sh

I tried, but I'm not getting the expected output:

sed  's/$ROOT/"${HOME}"/g' abc.sh > abc.sh.1

---

Addition:

If I have abc.sh

exec $ROOT/Subsystem/xyz.sh $ROOT/ystem/xyz1.sh

then with

sed "s|\$INSTALLROOT/|${INSTALLROOT}|" abc.sh

it is only replacing first $ROOT, i.e., output is coming as

exec /HOME/COM/FILE/Subsystem/xyz.sh $ROOT/ystem/xyz1.sh

Say:

sed "s|\$ROOT|${HOME}|" abc.sh

Note:

• Use double quotes so that the shell would expand variables.
• Use a separator different than / since the replacement contains /
• Escape the $ in the pattern since you don't want to expand it.

EDIT: In order to replace all occurrences of $ROOT, say

sed "s|\$ROOT|${HOME}|g" abc.sh

This might work for you:

sed 's|$ROOT|'"${HOME}"'|g' abc.sh > abc.sh.1

This may also can help

input="inputtext"
output="outputtext"
sed "s/$input/${output}/" inputfile > outputfile

The safe for a special chars workaround from https://www.baeldung.com/linux/sed-substitution-variables with improvement for \ char:

#!/bin/bash
to="/foo\\bar#baz"
echo "str %FROM% str" | sed "s#%FROM%#$(echo ${to//\\/\\\\} | sed 's/#/\\#/g')#g"