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. iOS：
iOS是苹果公司提供的移动操作系统。它主要是为iPhone和iPod Touch等Apple移动设备设计的。它以前被称为iPhone OS。它是基于Darwin(BSD)操作系统的类Unix操作系统。它是仅次于Android的世界第二使用最多的移动操作系统。它主要用C，C++，Objective-C，汇编语言和Swift编写。 iOS的第一个版本于2007年发布。
Linux和iOS之间的区别：
| S.No. | LINUX | IOS |
|---|---|---|
| 1. | It was developed by Linus Torvalds. | It was developed by Apple Incorporation. |
| 2. | It was launched in 1991. | It was launched in 2007. |
| 3. | Its target system types are embedded systems, mobile devices, personal computers, servers, mainframe computers and supercomputers. | Its target system types are smartphone, music player and tablet computer. |
| 4. | Computer architectures supported by Linux are IA-32, x86-64, ARM, PowerPC and SPARC. | Computer architectures supported by iOS are ARMv8-A (iOS 7-present), ARMv7-A (iPhone OS 3-iOS 10) and ARMv6 (iPhone OS 1-iOS 4.2.1). |
| 5. | Its kernel type is Monolithic. | Its kernel type is Hybrid. |
| 6. | Its native APIs are LINUX/POSIX. | Its native APIs are Cocoa and BSD-POSIX. |
| 7. | It has preferred license of GNU GPLv2 (kernel). | It has the preferred license of Proprietary, APSL and GNU GPL. |
| 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 update management depends on the distribution. | Its update management is Software Update. |
| 10. | File systems supported by Linux are ext2, ext3, ext4, btrfs, ReiserFS, FAT, ISO 9660, UDF and NFS. | File systems supported by iOS are HFS+ and APFS. |