How To Determine Running Linux is Vmware or not

There are several ways to determine that running system is vmware or not. 

1. dmidecode -s system-manufacturer
2. view  /sys/class/dmi/id/sys_vendor
3. lspci | grep -i vmware
4. grep -i vmware /proc/scsi/scsi /proc/ide/*/model
5. dmesg |grep Vmware
6. rpm -qa | grep -i vmware