The built-in Vim :sort command supports sorting either all lines in a buffer or a range of lines.
For example to sort a range of lines it's possible to visually select those lines then run :sort.
Help docs can be accessed via :help :sort and can be viewed online via vimhelp.org.
Example: Sort on pattern
It's possible to sort on a specific part of each line by specifying either a search pattern to ignore (the default) or a search pattern that matches the text to search on.
For example to sort the following output from running du -h --max-depth=1 base_map_cache_EPSG27700/ by the last component of the path:
1.6G base_map_cache_EPSG27700/10
524K base_map_cache_EPSG27700/04
25G base_map_cache_EPSG27700/12
108K base_map_cache_EPSG27700/01
328K base_map_cache_EPSG27700/02
3.4M base_map_cache_EPSG27700/06
360K base_map_cache_EPSG27700/03
69M base_map_cache_EPSG27700/08
18M base_map_cache_EPSG27700/07
68K base_map_cache_EPSG27700/00
1.4M base_map_cache_EPSG27700/05
266M base_map_cache_EPSG27700/09
6.4G base_map_cache_EPSG27700/11
34G base_map_cache_EPSG27700/
Visually selecting the above in a buffer and typing :sort /\v\d+$/ r will result in:
34G base_map_cache_EPSG27700/
68K base_map_cache_EPSG27700/00
108K base_map_cache_EPSG27700/01
328K base_map_cache_EPSG27700/02
360K base_map_cache_EPSG27700/03
524K base_map_cache_EPSG27700/04
1.4M base_map_cache_EPSG27700/05
3.4M base_map_cache_EPSG27700/06
18M base_map_cache_EPSG27700/07
69M base_map_cache_EPSG27700/08
266M base_map_cache_EPSG27700/09
1.6G base_map_cache_EPSG27700/10
6.4G base_map_cache_EPSG27700/11
25G base_map_cache_EPSG27700/12
The pattern in the command :sort /\v\d+$/ r, breaks down as:
\venables full regular expression support including$to match the end of the line\d+$matches one or more digits at the end of the line
The r flag indicates that the sorting should be done based on the search match.