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Try

awk '{gsub ("vijay@gmail.com", "vijay.bhaskar@gmail.com")} 1' $(find /home -name "*.sh")

Running find against / (root) is not great idea.

Run your code as a non-privleged user.

Try
find / -type f -name '*.sh' -exec grep -l 'vijay@gmail.com' {} \; > ~/mylist
then check the list....

Users can't delete threads. I've dealt with it. Thank you.

If your grep doesn't support the -A and the -B options you can try:
awk 'NR==FNR{if($0 ~ /error/){n=NR}next}FNR > n-4 && FNR < n+4' /home/file.txt /home/file.txt