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=One-Liners=
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Case insensitive search
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grep -i "the" demo_file
! Task !! Command
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Checking for full words, not for sub-strings
| Search for the given string in a single file || grep "this" demo_file
grep -iw "is" demo_file
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| Checking for the given string in multiple files || grep "this" demo_*
Display N lines after match
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grep -A 3 -i "example" demo_text
| Case insensitive search || grep -i "the" demo_file
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Display N lines before match
| Checking for full words, not for sub-strings || grep -iw "is" demo_file
grep -B 2 "single WORD" demo_text
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| Display N lines after match || grep -A 3 -i "example" demo_text
Display N lines around match
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| Display N lines before match || grep -BC 2 "single WORDExample" demo_text
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Color Filtered Output
| Display N lines around match || grep -C 2 "Example" demo_text
grep "Gecko" /data --color=always
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| Color Filtered Output || grep "Gecko" /data --color=always
Highlighting the search using GREP_OPTIONS
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| Highlighting the search using GREP_OPTIONS || export GREP_OPTIONS='--color=auto' GREP_COLOR='100;8'
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| Searching in all files recursively || grep -r "ramesh" *
grep -r "ramesh" *
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| Invert match || grep -v "go" demo_text
Invert match
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grep -v "go" demo_text
| display the lines which does not matches all the given pattern || grep -v -e "a" -e "b" -e "c" test-file.txt
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|Display How manythe lines which does not matches all the given pattern || grep -c "go" demo_text<br />grep -c this demo_file
grep -v -e "a" -e "b" -e "c" test-file.txt
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| How many lines that does not match the pattern || grep -v -c this demo_file
How many lines matches the given pattern
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grep -c "go" demo_text<br />grep -c this demo_file
| Display only the file names which matches the given pattern || grep -l this demo_*
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How many lines that does not match the pattern
| Show only the matched string || grep -o "is.*line" demo_file
grep -v -c this demo_file
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| Show line number while displaying the output || grep -n "go" demo_text
Display only the file names which matches the given pattern
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grep -l this demo_*
| Filter comments from a config file || <nowiki>grep -vE '^#|^;|^$' server.conf</nowiki>
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Show only the matched string
| Search for "virus" in all files in a dir || grep virus /etc/snort/rules/*
grep -o "is.*line" demo_file
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| Search this or that using Extended Regex || <nowiki>grep -E '(then|there)' demo_text</nowiki>
Show line number while displaying the output
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grep -n "go" demo_text
| Search this or that without Extended Regex || <nowiki>grep '\(then\|there\)' demo_text</nowiki>
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Filter comments from a config file
| Search this or that grouping not necessary || <nowiki>grep 'then\|there' demo_text</nowiki>
<nowiki>grep -vE '^#|^;|^$' server.conf</nowiki>
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| Search this or that grouping required || <nowiki>grep 'the\(n\|re\)' demo_text</nowiki>
Search for "virus" in all files in a dir
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grep virus /etc/snort/rules/*
| Search Email addresses using regex || <nowiki>grep -E -o "\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,6}\b" filename.txt</nowiki>
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Search this or that using Extended Regex
| Grep from compressed files || zgrep -I "free space" ./messages*
<nowiki>grep -E '(then|there)' demo_text</nowiki>
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Search this or that without Extended Regex
<nowiki>grep '\(then\|there\)' demo_text</nowiki>
Search this or that grouping not necessary
<nowiki>grep 'then\|there' demo_text</nowiki>
Search this or that grouping required
<nowiki>grep 'the\(n\|re\)' demo_text</nowiki>
Search Email addresses using regex
<nowiki>grep -E -o "\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,6}\b" filename.txt</nowiki>
Grep from compressed files
zgrep -I "free space" ./messages*
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