date 12 - hour clock

When we need only 12 hours date. 

find command with size and $PWD

 find and size command via $PWD variable:

Linux IP forwarding – How to Disable/Enable using net.ipv4.ip_forward

RHCSA question: 

 Linux IP forwarding – How to Disable/Enable using net.ipv4.ip_forward

tar to differnt directory

tar -C

Ubuntu - expire gpg key

When we have a problem with expire gpg key