pbpaste:tldr:d3195

This command is written in the Unix command line format and it consists of two parts connected by the pipe symbol "|".

The "pbpaste" command is a command-line utility specific to macOS. It allows you to access the contents of the clipboard and output it to the command line. It is used to retrieve the text that was copied by the user or some previous command.

The "|" (pipe) symbol is known as a pipe operator. It allows the output of one command to be used as input for another command.

The "grep" command is a powerful text search tool available in Unix-based systems. It is used to search for specified patterns or words within a file or in this case the output of the previous command. It filters and displays only the lines that match the specified pattern.

In the command you provided, the "pbpaste" command retrieves the text from the clipboard, and its output is then passed (piped) as input to the "grep" command. The "grep foo" part tells "grep" to search for the word "foo" in the provided input.

So, in summary, the command "pbpaste | grep foo" takes the text from the clipboard and searches for lines that contain the word "foo" in that text, displaying any matching lines as the output.