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* src/du.c (opt_threshold): Add variable to hold the value of the --threshold option specified by the user. (long_options): Add a required_argument entry for the new --threshold option. (usage): Add --threshold option. (process_file): Elide printing the entry if its size does not meet the value specified by the --threshold option. (main): In the argument parsing loop, add a case for the new -t option. Convert the given argument by permitting the well-known suffixes for megabyte, gigabytes, etc. Handle the special case "-0": give an error as this value is not permitted. * doc/coreutils.texi (du invocation): Add documentation for the above new option. * tests/du/threshold.sh: Add new test to exercise the new option. * tests/local.mk (all_tests): Mention the above test. Co-authored-by: Bernhard Voelker <mail@bernhard-voelker.de>