解决 ln -s 软链接产生的Too many levels of symbolic links错误

解决 ln -s 软链接产生的Too many levels of symbolic links错误
解决方法：在使用ln -s命令时，使用绝对路径取代相对路径，例如：

ln -s /home/sdn/cmake/bin/cmake /usr/bin/cmake

原因，有一个路径不存在

https://unix.stackexchange.com/questions/555807/how-to-resolve-too-many-levels-of-symbolic-links-on-my-documents-folder

https://unix.stackexchange.com/questions/285045/too-many-levels-of-symbolic-links-in-usr-bin-disaster

https://www.ieor.iitb.ac.in/files/faculty/amahajan/howtos/too_many_levels.html

https://stackoverflow.com/questions/9770658/too-many-levels-of-symbolic-links-osx-lion

https://stackoverflow.com/questions/55805184/how-to-fix-too-many-levels-of-symbolic-links-error-in-virtualenv