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.NetBSD：
NetBSD 是由 NetBSD 基金会提供的免费开源操作系统。它基于 Berkeley Software Distribution。它是一个类Unix操作系统。它可用于许多平台，包括服务器、台式机、手持设备和嵌入式系统。 NetBSD 项目侧重于跨许多计算机体系结构的精心设计、代码清晰度和可移植性。 NetBSD 的源代码是公开可用的，并获得许可。 NetBSD 的第一个版本于 1993 年推出，其内核类型是单片的。
Linux 和 NetBSD 的区别：
| S.No. | LINUX | NETBSD |
|---|---|---|
| 1. | It was developed by Linus Torvalds. | It was developed by The NetBSD Foundation. |
| 2. | It was launched in 1991. | It was launched in 1993. |
| 3. | Its target system types are embedded systems, mobile devices, personal computers, servers, mainframe computers and supercomputers. | Its target system types are NAS, server, workstation and embedded systems. |
| 4. | Computer architectures supported by Linux are IA-32, x86-64, ARM, PowerPC and SPARC. | Computer architectures supported by NetBSD are IA-32, x86-64, ARM, MIPS, PowerPC and sparc64. |
| 5. | Its kernel type is Monolithic. | Its kernel type is Monolithic with modules. |
| 6. | Its native APIs are LINUX/POSIX. | Its native APIs are BSD-POSIX. |
| 7. | It has preferred license of GNU GPLv2 (kernel). | It has the preferred license of BSD. |
| 8. | Its package management depends on the distribution. | Its package management is pkgsrc. |
| 9. | The non-native APIs supported through its subsystems are Mono, Java, Win16 and Win32. | The non-native APIs supported through its subsystems are Linux and others. |
| 10. | Its update management depends on the distribution. | Its update management is by source or by binary. |
| 11. | File systems supported by Linux are ext2, ext3, ext4, btrfs, ReiserFS, FAT, ISO 9660, UDF and NFS. | File systems supported by NetBSD are UFS, UFS2, ext2, FAT, ISO 9660, NFS and LFS. |