Task: Display the contents of textfile3.txt and textfile4.txt side by side, with line numbers and a separator between them.
Command: paste <(nl /testbed/dir3/subdir1/subsubdir1/textfile3.txt) <(nl /testbed/dir1/subdir1/textfile4.txt)
Equivalent command: paste <(nl /testbed/dir3/subdir1/subsubdir1/textfile3.txt) <(nl /testbed/dir1/subdir1/textfile4.txt)