Unix and Linux share many basic commands. For example, ‘ls’, ‘cd’, and ‘cp’ are common in both systems.
Unix typically uses the Bourne shell (‘sh’). Linux often uses the Bourne Again Shell (‘bash’), which has additional features.
Linux aims for backward compatibility with Unix, but differences in commands and features can affect script portability.
Both systems use hierarchical file systems. However, Linux supports more file system types like ext3, ext4, and Btrfs.
Unix and Linux use similar file permission systems (‘rwx’), but Linux has extended access control lists (ACLs) for finer control.
Linux installs software via package managers (like "apt" and "yum"). Unix often relies on manual installations or tarballs.