| -i |
Ignore case distinctions in both the PATTERN and the input files
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| -n |
Prefix each line of output with the 1-based line number within its input file
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| -v |
Invert the sense of matching, to select non-matching lines
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| -w |
Select only those lines containing matches that form whole words
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| -r(R) dir |
Read all files under each directory, recursively; this is equivalent to the -d recurse option
# grep -r 'word' dir
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