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| # Tailing a big file especially log file | |
| tail -f filename | |
| # search for content | |
| grep 'pattern' | |
| # search with OR condition | |
| grep -E 'pattern1|pattern2' | |
| # search with AND condition | |
| grep -E 'pattern1.*pattern2' | |
| # search with NOT condition | |
| grep -v 'negation term' | |
| # search with lines above and below the result line. | |
| grep -C 25 'pattern' |
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