1. Linux：
Linux 是一组开源的类 Unix 操作系统，由 Linus Torvalds 开发。它是一个打包的 Linux 发行版。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。 Linux 的第一个版本于 1991 年推出。
2. 操作系统/2：
OS/2 是微软公司和IBM 合作开发的一系列操作系统。它的目标系统是个人计算机和服务器。它是使用 C、C++ 和汇编语言编写的。 OS/2 的第一个版本于 1987 年推出。它于 2006 年停产，之后以eComStation的名义进行更新、维护和销售。 2015 年，它被命名为ArcaOS 。此操作系统中使用的内核是带有模块的 Monolithic。
Linux 和 OS/2 的区别：
| S.No. | LINUX | OS/2 |
|---|---|---|
| 1. | It was developed by Linus Torvalds. | It was developed by co-ordination of Microsoft Inc. and IBM. |
| 2. | It was launched in 1991. | It was launched in 1987. |
| 3. | Its target system types are embedded systems, mobile devices, personal computers, servers, mainframe computers and supercomputers. | Its target system types are personal computers and servers. |
| 4. | Computer architectures supported by Linux are IA-32, x86-64, ARM, PowerPC and SPARC. | Computer architectures supported by OS/2 are 16-bit x86 (1.x only) and IA-32. |
| 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, DOS API and Win16. |
| 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 Win32. |
| 9. | Its package management depends on the distrubution. | Its package management is Feature Install. |
| 10. | File systems supported by Linux are ext2, ext3, ext4, btrfs, ReiserFS, FAT, ISO 9660, UDF and NFS. | File systems supported by OS/2 are HPFS, JFS, FAT, ISO 9660, UDF and NFS. |