[u]

1. u_char
2. u_int
3. u_long
4. u_short
5. uncompress
6. unexpected_eof
7. ungetpath
8. unknown_preprocessing_directive
9. unknown_yacc_directive
10. unload_deplibs
11. unload_filemap
12. unload_gpath
13. unload_plugin_parser
14. unput
15. updatetags
16. upperdir
17. usable
18. usage