grep

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grep
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grep -B 5 -A 2 --color 'keyword' /path/to/file.log

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Secret script for finding certain nasties:
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# grep -Rl "= Array('1'=>'" /var/www/vhosts 2>/dev/null
# grep -Rl " (base64_decode (" /var/www/vhosts 2>/dev/null

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Recursive Grep:
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# grep -R "x" .*