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S:\>perl.exe -nle"1+index($_, 'clanks') and print" 8gb.txt | wc -l 2048
S:\>grep -F clanks 8gb.txt | wc -l 2048
S:\>perl -le"while(<>){ 1+index($_, 'clanks') and print; }" 8gb.txt | +wc -l 4096