Dell Service Tag using Command line in Windows , Linux , Ubuntu 14.04

Service tag is useful when We need support from company it show product  Information like manufacturing date , warrenty period etc . We can get service tag using using this command line for dell system

For Ubuntu 14.04 we can type this line in terminal
sudo dmidecode -s system-serial-number


For Linux other than ubuntu we can type this line in terminaland get service code
dmidecode -s system-serial-number



For Windows we can type this line in terminal
wmic bios serialnumber

Thank you