Category Archives: Tips


Playing with User logins
1) How to stop user:-
# skill -STOP -u username

2) How to resume already halted user:-
#skill -CONT -u username

3) Kill and Logout all users:-
# skill -KILL -v /dev/pts/*

4) To restart the session:-
# kill -9 `ps -u username | grep -v TTY, awk ‘{print $1}’`

PROCESSOR 64-bit VS 32-bit

32-bit and 64-bit OS:

A 64 bit processor is faster than a 32 bit processor. For 32 bits there is no need of any wide main bus to carry 32 bits at a time but for 64 bits its must that you should have a wider bus to carry 64bits.
On a 32-bit operating system, you are restricted to a maximum of 4 gigabytes of RAM. On a 64-bit operating system, you really do not have a limit. It can use 2^64 bits of space to address.
264 addresses, equivalent to approximately 17.2 billion gigabytes, 16.3 million terabytes, or 16 hexabytes of RAM.