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03f6f32c41
* src/sort.c (usage): Mention --debug can output warnings to stderr. Also split the translatable string to aid translation. (default_key_compare): A new function refactored from main(), and now also called from the new key_warnings() function. (key_to_opts): A new function refactored from incompatible_options(), and now also called from the new key_warnings() function. (key_numeric): A new function refactored to test if key is numeric. (key_warnings): A new function to output warnings to stderr, about questionable use of various options. Currently it warns about zero length keys and ineffective global options. (incompatible_options): Refactor out key_to_opts() (main): Use key_init() to initialize gkey. Refactor out default_key_compare(). Call key_warnings() in debug mode. * doc/coreutils.texi (sort invocation): Mention that warnings are output by --debug. * tests/misc/sort-debug-warn: A new test for debug warnings. * tests/Makefile.am: Reference the new test. * NEWS: Mention the new feature