The Find Unmatched Query Wizard finds records in one table that do not have related records in another table

Explain the following error message. Which filenames would a subsequent ls command display?

$ ls abc abd abe abf abg abh $ rm abc ab* rm: cannot remove 'abc': No such file or directory

Changing the ____________________ changes the color of an instance.

Fill in the blank(s) with the appropriate word(s).