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. HP-UX：
HP-UX是HP Enterprise提供的封闭源操作系统。它是一种类似Unix的操作系统，其设计基于Unix SystemV。它基本上是为HP计算机设计的。它的目标系统是服务器。它是五个具有The Open Group的UNIX 03标准认证的商业操作系统之一。 HP-UX的第一个版本发布于1983年。它具有带有可动态加载模块的Monolithic内核。
Linux和HP-UX之间的区别：
| S.No. | LINUX | HP-UX |
|---|---|---|
| 1. | It was developed by Linus Torvalds. | It was developed by HP Enterprise. |
| 2. | It was launched in 1991. | It was launched in 1983. |
| 3. | Its target system types are embedded systems, mobile devices, personal computers, servers, mainframe computers and supercomputers. | Its target system types are servers. |
| 4. | Computer architectures supported by Linux are IA-32, x86-64, ARM, PowerPC and SPARC. | Computer architectures supported by HP-UX are PA-RISC and IA-64. |
| 5. | Its kernel type is Monolithic. | Its kernel type is Monolithic with dynamically loadable modules. |
| 6. | Its native APIs are LINUX/POSIX. | Its native APIs are SysV/POSIX. |
| 7. | It has preferred license of GNU GPLv2 (kernel). | It has the preferred license Proprietary. |
| 8. | The non-native APIs supported through its subsystems are Mono, Java, Win16 and Win32. | The non-native APIs are not supported through its subsystems. |
| 9. | Its package management depends on the distribution. | Its package management is SD or swinstall. |
| 10. | Its update management depends on the distribution. | Its update management is SWA (HP-UX Software Assistant)). |
| 11. | File systems supported by Linux are ext2, ext3, ext4, btrfs, ReiserFS, FAT, ISO 9660, UDF and NFS. | File systems supported by HP-UX are VxFS, HFS, CDFS, EVFS, NFS and CIFS. |