Using sed to replace a number greater than a specified number at a specified position

Question

I need to write a script to replace all the numbers greater than an specified number which is in following position.

1499011200 310961583 142550756 313415036 14         


        

Answer 1

In awk:

$ awk '$2>300000000{for(i=3;i<=NF;i++)$i="XXXX"}1' file
1499011200 310961583 XXXX XXXX XXXX

Explained:

$ awk '                 # using awk
$2>300000000 {          # if the second value is greater than ...
    for(i=3;i<=NF;i++)  # for each value aftef the second
        $i="XXXX"       # replace it with XXXX
}1' file                # output