If you give tab space to specific file with append a word or lines using shell command,
# echo -e ' \t '
echo a tab space newline
If you give tab spece to specific file with append a word or lines,
# sed -i "/find word/a\t append word" file_name.txt
or multiple tab,
# sed -i "/find word/a\t\t\t append word" file_name.txt
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