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GNU coreutils çå¨çº¿å¸®å©ï¼ <https://www.gnu.org/software/coreutils/>
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Copyright © 2022 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
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å®æ´æ档请è§ï¼ <https://www.gnu.org/software/coreutils/sum>
æèå¨æ¬å°ä½¿ç¨ï¼ info '(coreutils) sum invocation'

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