Steps that do something with (lines in) text documents.
p:text-count - Counts the number of lines in a text document.
p:text-head - Returns lines from the beginning of a text document.
p:text-join - Concatenates text documents.
p:text-replace - Replace substrings in a text document.
p:text-sort - Sorts lines in a text document.
p:text-tail - Returns lines from the end of a text document.