awk '{flag=0;
    for(i=1; i<=NF; i++) {
        if ($i == "this"){
            flag=1;
        }
    } 
    if (flag != 1) {
        print $0;
        flag=0;
    }
}' nowcoder.txt

grep -v this

sed '/this/d'

awk '$0!~/this/ {print $0}'

awk '{
    if ($0 !~ /this/) {
        print $0
    }
}'