Which command employs the '-e' option for searching multiple strings?

The command that employs the '-e' option for searching multiple strings is grep. This command is widely used in Unix-like operating systems to search through text using regular expressions. When the '-e' option is specified, it allows the user to provide multiple patterns to search for simultaneously. This is particularly useful when you want to find occurrences of different strings within the same file or input without needing to run multiple commands.

For example, using grep with the '-e' option followed by different strings makes it possible to find lines in a file that contain any of the specified patterns. This increases efficiency and simplifies the command usage, as you can consolidate multiple searches into one command line.

Other commands listed serve different purposes: ps is used for displaying currently running processes, cat is typically used for concatenating and displaying file content, and more is a pager program used for viewing text files one screen at a time. Therefore, they do not have functionality related to searching for multiple strings in the same way grep does.