$cat name.txt 1 ram 2 shyam 3 raju 4 biju $cat company.txt 1 google 2 facebook 3 twitter 4 ibm $join company.txt name.txt 1 google ram 2 facebook shyam 3 twitter raju 4 ibm biju $join name.txt company.txt 1 ram google 2 shyam facebook 3 raju twitter 4 biju ibm $