Which command lists all files in the current directory that start with a capital letter?

The glob pattern [A-Z]* uses a bracket expression to match any single uppercase letter A through Z as the first character, followed by * which matches zero or more of any characters. The shell expands this pattern before passing arguments to ls, listing all files in the current directory whose names begin with a capital letter.

ls A-Z is interpreted as a literal filename argument named A-Z, not a range, so ls will look for a file or directory literally called A-Z.

ls A-Z* treats A-Z as a literal prefix and * as a wildcard after it, matching files whose names literally start with the string A-Z, not files starting with any uppercase letter.

--uppercasefiles is not a valid ls option; ls will return an error for this unrecognized flag.

list-uppercase-files is not a valid Linux command and will result in a command not found error.