linux - replace null to ""test"" in a file using unix -


i have below pattern in file @ different lines

""key"": null

i want replaceu 

""key"": ""test""

through linux

i used below commands:

sed -i 's/ null / ""test"" /' sed -i 's/ null / \"\"test\"\" /'

but failed.

this should it:

 sed -i 's/null/\"\"test\"\"/g' file.txt

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