Originally Posted by b@l@ji

Hi,

I need help in following two tasks.

Tasks:1 Column comparison between two files.

There is a file_1 with columns $1 , $2 , $3 , $4 , $5
Another is file_2 with columns $1 , $2 , $3 , $4 , $5

1.) i wish to compare whether values in $2 in file_1 is equal to $3 in file_2 and $3 in file_1 is equal to $5 in file_2

2.) i wish to replace the column $1 in file_2 using the values in the column $5 from file_1

Tasks:2 How to add extra lines to an existing file ?

for example, i want to add following two lines to an existing file at bottom. Is it possible to do it, without having to write the below two lines into a separate file and use "cat" command ?

Numbers
5678