You want to remove all the files that begin with Pic . This command will remove all five of the files you want to delete, and leave the rest of your directory intact. Since you have other files with that suffix, this probably isn't something you want to do. Whenever you use wildcards in Unix commands, it's a good idea to specify as much of the filename as you're able to, to better tailor the number of files the command will be applied to. A named entity within a filesystem.
Files usually contain data but can also be created empty.
When you create and save a document in the Pico editor on GPU, for example, that document becomes a file in your filesystem. A directory which exists within another directory. The directory containing the subdirectory is called the parent directory. The name assigned to a directory file entry to identify it. A pathname tells you where a file is located within the hierarchical filesystem structure.