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