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. OS / 2：
OS / 2是由Microsoft Incorporation和IBM协调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。它使用C，C++和汇编语言编写。 OS / 2的第一个版本于1987年发布。它于2006年停产，此后以eComStation的名称进行更新，维护和销售。在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之间的区别：
| 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. |