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TenthLine - bash
Well I think the example given in the TenthLine.sh is a pure cheating. Here a few good examples for faster bash solution:
declare i=1;
while read line;
do ((++i)); [[ i -eq 11 ]] && echo $line;
done < file.txt
or
IFS=$'\n' readarray arr < file.txt; echo ${arr[9]}