| -i |
ignore case distinctions in patterns and data
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| -n |
print line number with output lines
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| -v |
select non-matching lines
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| -w |
match only whole words
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| -x |
match only whole lines
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| -E |
PATTERNS are extended regular expressions
# grep -E 'word|test|test2' /home/test.txt
search for 'word' or 'test' or 'test2'
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| -F |
PATTERNS are strings
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| -G |
PATTERNS are basic regular expressions
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| -P |
PATTERNS are Perl regular expressions
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| -H |
print file name with output lines
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| -c |
print only a count of selected lines per FILE
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| -B NUM |
print NUM lines of leading context
# grep -B 4 http /etc/services
show results including the first 4 lines before the line where 'http' matches
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| -A NUM |
print NUM lines of trailing context
# grep -A 4 http /etc/services
show results including the last 4 lines after the line that matches 'http'
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| -C NUM |
print NUM lines of output context
# grep -C 4 http /etc/services
show results including 4 lines before and after the line that matches 'http'
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| -r |
search files in a directory for a pattern
# grep -r 'word' /home
display files that contain the 'word' in /home
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