问题 I have done 2000 analyses, each named by a string containing spaces, numbers, and parentheses, and every analysis has produced three (vector) pdf files. For example, for analysis John Doe 7 (m) I have the following pdfs: John Doe 7 (m)_upper_left.pdf , John Doe 7 (m)_upper_right.pdf , John Doe 7 (m)_lower.pdf as want to make a one-page pdf file for John Doe 7 (m) , where they are arranged as follows in John Doe 7 (m)_whole : And do this for all other analyses ( Jake Levinson 12 (k) , ...),