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Grep -C option not available

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# 8  
You can 'grep -n <each_file>' out the line numbers into "while read n l" and use another tool like 'sed' to display each with context and then print a divider. Handling of adjacent lines and BOF/EOF is a small challenge.
# 9  
Yet another way is using diff's context option:
grep -v 555 file | diff -c - file | awk 'NR>5{print $NF}'


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