there were not much difficult questions - delete files which are 30 days older - How to check how much space certain process has occupied in memory - if host is slow, what you will check - what is shared memory - what is IPC and its types - how to run a script on remote host - there is file with random alphabets on individual lines, calculate frequency of each alphabet (optimal way) - there is file of 2GB something.gz you have to unzip it but host will not allow files more than 2GB, how will you extract this file in 5 parts - there is table called teamA, which a colom of team names, write a query to create cricket schedule among these teams - how to calculate how much space occupied by home directory - how to run a script on remote server without copying script to that host - write a script which takes input N, and returns true or false depending on below conditions N=4 1-2-3+4=0 if any combination of + and - is giving zero then script should return TRUE. - there is file which has customer records in below form <Customer ID> <Current Plan> <History plan1> <History Plan 2> .. <History Plan N> where Plan can be A,B,C How to get all customers who are using plan C as current plan and in history they have used the same plan sometime back.