Sed - insert character between tag

[Bruno Galindro da Costa]

Hi all!

I have a text file with this content:

VAR_1="xyz "abcd" fgh"

Using sed, how can I insert a backslash before the two quotes between the
first and last quote?

e.g.: VAR_1="xyz \"abcd\" fgh"

-- 
Att.
Bruno Galindro da Costa
bruno.galindro at gmail.com
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