1. Linux：
Linux是由Linus Torvalds开发的一组类似于Unix的开源操作系统。它是Linux发行版的打包。一些最常用的Linux发行版是Debian，Fedora和Ubuntu。它基本上是用C语言和汇编语言编写的。 Linux中使用的内核是Monolithic内核。 Linux发行版的目标系统是云计算，嵌入式系统，移动设备，个人计算机，服务器，大型计算机和超级计算机。 1991年发布了第一个Linux版本。
2. OpenVMS：
OpenVMS是由Digital Equipment Corporation(DEC)开发的多用户和多处理操作系统。它是基于虚拟内存的操作系统，旨在用于分时，批处理和事务处理。它可用于许多平台，包括服务器和工作站。它是使用BLISS，VAX Macro，C，Ada，PL / I，Fortran，UIL，Pascal，SDL，C++和DCL编写的。 OpenVMS的第一个版本于1977年发布。此操作系统中使用的内核与模块是整体的。
Linux和OpenVMS之间的区别：
| S.No. | LINUX | OPENVMS |
|---|---|---|
| 1. | It was developed by Linus Torvalds. | It was developed by Digital Equipment Corporation (DEC). |
| 2. | It was launched in 1991. | It was launched in 1977. |
| 3. | Its target system types are embedded systems, mobile devices, personal computers, servers, mainframe computers and supercomputers. | Its target system types are server and workstation. |
| 4. | Computer architectures supported by Linux are IA-32, x86-64, ARM, PowerPC and SPARC. | Computer architectures supported by OpenVMS are VAX, Alpha and IA-64. |
| 5. | Its kernel type is Monolithic. | Its kernel type is Monolithic with modules. |
| 6. | Its native APIs are LINUX/POSIX. | Its native APIs are Proprietary. |
| 7. | It has the preferred license of GNU GPLv2 (kernel). | It has the preferred license of Proprietary. |
| 8. | The non-native APIs supported through its subsystems are Mono, Java, Win16 and Win32. | The non-native APIs supported through its subsystems are POSIX. |
| 9. | Its package management depends on the distribution. | Its package management is PCSI or VMSINSTAL. |
| 10. | It has default GUI ‘on’. | It does not have default GUI ‘on’. |
| 11. | File systems supported by Linux are ext2, ext3, ext4, btrfs, ReiserFS, FAT, ISO 9660, UDF and NFS. | File systems supported by OpenVMS are Files-11, ISO 9660, NFS and CIFS. |