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Show only the subdirectories in the current directory. In the example above, /lib has 135 files and directories. With this command, the 9 dirs jump out.
Sort a list of IPV4 addresses in numerical order. Great as a filter, or within vim using !}
Often, when sorting you want the sort to ignore extraneous characters. The b, d, and f tell sort to ignore leading blanks, use 'dictionary order' (ignore punctuation), and ignore (fold) case. Add a "u" if you only want one copy of duplicate lines.
This is a great command to use within vim to sort lines of text, using !}sort -bdf