Linux Combine two files by column

Question

I am trying to combine two files as below (Intersection)

ID     Name  Telephone       
1      John     011
2      Sam      013
3      Jena     014
4      Pet         


        

Answer 1

Another alternative would be pr which is used for formating files to print.

$ pr -tm -w 50 Test1.txt Test2.txt
ID     Name  Telephone   ID Remark1  Remark2
1      John      011     1   Test1    Test2
2      Sam       013     2   Test3    Test4
3      Jena      014     3   Test5    Test6
4      Peter     015     4   Test7    Test8
                         5   Test7    Test8
                         6   Test7    Test8
                         7   Test7    Test8
                         8   Test7    Test8
                         9   Test7    Test8

The most important is the m flag which merges files into columns. The t flag removes headers and footers - since we're not going to print on paper, we don't need them. The last w flag is for setting width.