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Jul 27th, 2017
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  1. echo "абвгд" | sed 's/в/1{фокус}/` # получим: aбв3гд
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  3. echo "абвгд" | sed 's/(.)/1n/g' | sed -n 'p;/в/=' | sed -n 'H;${x;s/n//g;p}'
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  5. echo "абвгд" | perl -Ca -pe 's/в/$&.(length($`)-1)/e'
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  7. echo "abcde" | awk 'match($0, /d/) {print substr($0, 0, RSTART),RSTART,substr($0, RSTART+1, RLENGTH)}' | sed 's/ //g'
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