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I am generating sed expression in Bash script, and I am having a following problem.

I want to add a space in front of each appearance of abc.

This commands works as expected

echo abc | sed -e "s/abc/ def/"

output is " def" without quotes

whereas this commands

Q='-e "s/abc/ def/"'
echo abc | sed $Q

outputs sed: -e expression #1, char 1: unknown command: `"'

Outside of bash script, everything works.

I tried all possible ways of quotes, escaping characters, but couldn't figure it out. Can someone help me?

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Use an array of options, not a single one:

Q=( -e "s/abc/ def/" )
echo abc | sed "${Q[@]}"

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