give some explain about GNU.
GNU, which stands for “GNU is not Unix”, is
A collection of utility tools that run on on top of Unix-clones or Unix-like operating system kernels
Or The license under which such utilities are released. GNU includes compiler tool chains like gcc, command line programs like grep and cat, editors like vim, and other utilities
GNU means coding standard and free software foundation not foundamental
GNU is a Unix-compatible operating system developed by the GNU project, which was started in 1983 by Richard Stallman with the goal of producing nonproprietary software. As such, users may download, modify and redistribute GNU software.
GNU is an operating system which is 100% free software. It was launched in 1983 by Richard Stallman and has been developed by many people working together for the sake of freedom of all software users to control their computing. Technically, GNU is generally like Unix. But unlike Unix, GNU gives its users freedom
Official GNU website: https://www.gnu.org/software/software.en.html