{"id":1573,"date":"2015-05-18T10:52:33","date_gmt":"2015-05-18T02:52:33","guid":{"rendered":"http:\/\/www.menglanglang.cn\/?p=1573"},"modified":"2015-05-18T13:55:33","modified_gmt":"2015-05-18T05:55:33","slug":"linux%e5%ba%95%e5%b1%82%e6%96%87%e4%bb%b6%e8%ae%bf%e9%97%ae","status":"publish","type":"post","link":"http:\/\/www.menglanglang.cn\/?p=1573","title":{"rendered":"Linux\u5e95\u5c42\u6587\u4ef6\u8bbf\u95ee"},"content":{"rendered":"

\u7b2c\u4e00\u6b65\uff1a\u65b0\u5efa\u4e00\u4e2a\u540d\u4e3a myfile.in \u7684\u6587\u4ef6\uff0c\u5e76\u5199\u5165\u4e00\u4e9b\u5185\u5bb9\uff0c\u5c3d\u91cf\u591a\u70b9\u513f\u3002<\/span><\/p>\n

vi myfile.in<\/code><\/p>\n

\u7b2c\u4e8c\u6b65\uff1a\u7f16\u5199\u6587\u4ef6\u8bbf\u95ee\u529f\u80fd\u4ee3\u7801\u3002<\/p>\n

\u4ee3\u7801\u4e00\uff1a\u9010\u4e2a\u5b57\u7b26\u7684\u6587\u4ef6\u590d\u5236\u7a0b\u5e8f\u3002<\/strong><\/p>\n

\u7f16\u5199 copy_file.c \u7684\u6587\u4ef6\uff0c\u5e76\u5b9e\u73b0\u8bfb\u6587\u4ef6\u548c\u5199\u6587\u4ef6\u7684\u64cd\u4f5c\uff0c\u7f16\u8bd1\u540e\u6267\u884c\u3002<\/p>\n

\n
\n
Code<\/strong>\u00a0\u00a0\u00a0View<\/a>Print<\/a><\/div>\n<\/div>\n
    \n
  1. #include\u00a0<unistd.h><\/span>\u00a0\u00a0<\/span><\/span><\/li>\n
  2. #include\u00a0<sys\/stat.h><\/span>\u00a0\u00a0<\/span><\/span><\/li>\n
  3. #include\u00a0<fcntl.h><\/span>\u00a0\u00a0<\/span><\/span><\/li>\n
  4. #include\u00a0<stdlib.h><\/span>\u00a0\u00a0<\/span><\/span><\/li>\n
  5. \u00a0\u00a0<\/span><\/li>\n
  6. int<\/span>\u00a0main()\u00a0{\u00a0\u00a0<\/span><\/span><\/li>\n
  7. \u00a0\u00a0char<\/span>\u00a0c;\u00a0\u00a0<\/span><\/span><\/li>\n
  8. \u00a0\u00a0int<\/span>\u00a0in,\u00a0out;\u00a0\u00a0<\/span><\/span><\/li>\n
  9. \u00a0\u00a0<\/span><\/li>\n
  10. \u00a0\u00a0in\u00a0=\u00a0open(\"myfile.in\"<\/span>,\u00a0O_RDONLY);\u00a0\u00a0<\/span><\/span><\/li>\n
  11. \u00a0\u00a0out\u00a0=\u00a0open(\"myfile.out\"<\/span>,\u00a0O_WRONLY|O_CREAT,\u00a0S_IRUSR|S_IWUSR);\u00a0\u00a0<\/span><\/span><\/li>\n
  12. \u00a0\u00a0while<\/span>(read(in,\u00a0&c,\u00a01)\u00a0==\u00a01)\u00a0{\u00a0\u00a0<\/span><\/span><\/li>\n
  13. \u00a0\u00a0\u00a0\u00a0write(out,\u00a0&c,\u00a01);\u00a0\u00a0<\/span><\/li>\n
  14. \u00a0\u00a0}\u00a0\u00a0<\/span><\/li>\n
  15. \u00a0\u00a0exit(0);\u00a0\u00a0<\/span><\/li>\n
  16. }\u00a0\u00a0<\/span><\/li>\n<\/ol>\n<\/div>\n

     <\/p>\n

    \n
      \n
    1. $\u00a0gcc\u00a0-o\u00a0copy_file\u00a0copy_file.c\u00a0\u00a0\u00a0<\/span><\/span><\/li>\n
    2. $\u00a0.\/copy_file\u00a0\u00a0<\/span><\/li>\n<\/ol>\n<\/div>\n

       <\/p>\n

      \u4ee3\u7801\u4e8c\uff1a \u5757\u5f62\u5f0f\u7684\u6587\u4ef6\u590d\u5236\u7a0b\u5e8f\uff08\u6bcf\u6b21\u590d\u5236\u957f\u5ea6\u4e3a1K\u7684\u6570\u636e\uff09\u3002<\/strong><\/p>\n

      \u7f16\u5199 copy_file_b.c \u7684\u6587\u4ef6\uff0c\u5e76\u5b9e\u73b0\u8bfb\u6587\u4ef6\u548c\u5199\u6587\u4ef6\u7684\u64cd\u4f5c\uff0c\u7f16\u8bd1\u540e\u6267\u884c\u3002<\/p>\n

      \n
      \n
      Code<\/strong>\u00a0\u00a0\u00a0View<\/a>Print<\/a><\/div>\n<\/div>\n
        \n
      1. #include\u00a0<unistd.h><\/span>\u00a0\u00a0<\/span><\/span><\/li>\n
      2. #include\u00a0<sys\/stat.h><\/span>\u00a0\u00a0<\/span><\/span><\/li>\n
      3. #include\u00a0<fcntl.h><\/span>\u00a0\u00a0<\/span><\/span><\/li>\n
      4. #include\u00a0<stdlib.h><\/span>\u00a0\u00a0<\/span><\/span><\/li>\n
      5. \u00a0\u00a0<\/span><\/li>\n
      6. int<\/span>\u00a0main()\u00a0{\u00a0\u00a0<\/span><\/span><\/li>\n
      7. \u00a0\u00a0char<\/span>\u00a0block[1024];\u00a0\u00a0<\/span><\/span><\/li>\n
      8. \u00a0\u00a0int<\/span>\u00a0in,\u00a0out;\u00a0\u00a0<\/span><\/span><\/li>\n
      9. \u00a0\u00a0int<\/span>\u00a0nread;\u00a0\u00a0<\/span><\/span><\/li>\n
      10. \u00a0\u00a0<\/span><\/li>\n
      11. \u00a0\u00a0in\u00a0=\u00a0open(\"myfile.in\"<\/span>,\u00a0O_RDONLY);\u00a0\u00a0<\/span><\/span><\/li>\n
      12. \u00a0\u00a0out\u00a0=\u00a0open(\"myfile.out\"<\/span>,\u00a0O_WRONLY|O_CREAT,\u00a0S_IRUSR|S_IWUSR);\u00a0\u00a0<\/span><\/span><\/li>\n
      13. \u00a0\u00a0while<\/span>((nread\u00a0=\u00a0read(in,\u00a0block,\u00a0<\/span>sizeof<\/span>(block)))\u00a0>\u00a00)\u00a0{\u00a0\u00a0<\/span><\/span><\/li>\n
      14. \u00a0\u00a0\u00a0\u00a0write(out,\u00a0block,\u00a0nread);\u00a0\u00a0<\/span><\/li>\n
      15. \u00a0\u00a0}\u00a0\u00a0<\/span><\/li>\n
      16. \u00a0\u00a0exit(0);\u00a0\u00a0<\/span><\/li>\n
      17. }\u00a0\u00a0<\/span><\/li>\n<\/ol>\n<\/div>\n

         <\/p>\n

        \n
          \n
        1. $\u00a0gcc\u00a0-o\u00a0copy_file_b copy_file_b.c\u00a0\u00a0\u00a0<\/span><\/span><\/li>\n
        2. $\u00a0.\/copy_file_b \u00a0<\/span><\/li>\n<\/ol>\n<\/div>\n

           <\/p>\n

          \u7b2c\u4e09\u6b65\uff1a\u67e5\u770b\u662f\u5426\u6709 myfile.out \u7684\u6587\u4ef6\u751f\u6210\uff0c\u5e76\u67e5\u770b\u5176\u4e2d\u5185\u5bb9\u662f\u5426\u548c myfile.in \u7684\u5185\u5bb9\u4e00\u81f4\u3002<\/span><\/p>\n

          \n
            \n
          1. $\u00a0ls\u00a0-ls\u00a0\u00a0<\/span><\/span><\/li>\n
          2. $\u00a0cat\u00a0myfile.out\u00a0\u00a0<\/span><\/li>\n<\/ol>\n<\/div>\n

             <\/p>\n

            \u7b2c\u56db\u6b65\uff1a\u4ee3\u7801\u4e00\u548c\u4ee3\u7801\u4e8c\u8fd0\u884c\u7684\u6548\u7387\u7684\u6bd4\u8f83\uff1a<\/p>\n

            \n
            <\/div>\n
              \n
            1. #\u00a0\u4ee3\u7801\u4e00\u8fd0\u884c\u6548\u7387\uff1a\u00a0\u00a0<\/span><\/span><\/li>\n
            2. $\u00a0TIMEFORMAT<\/span>=<\/span>\"\"<\/span>\u00a0time\u00a0.\/copy_file\u00a0\u00a0\u00a0<\/span><\/span><\/li>\n
            3. 0.15user\u00a021.10system\u00a00:21.27elapsed\u00a099%CPU\u00a0(0avgtext+0avgdata\u00a0324maxresident)k\u00a0\u00a0<\/span><\/li>\n
            4. 0inputs+480outputs\u00a0(0major+117minor)pagefaults\u00a00swaps\u00a0\u00a0<\/span><\/li>\n
            5. \u00a0\u00a0<\/span><\/li>\n
            6. #\u00a0\u4ee3\u7801\u4e8c\u8fd0\u884c\u6548\u7387\uff1a\u00a0\u00a0<\/span><\/li>\n
            7. $\u00a0TIMEFOEMAT<\/span>=<\/span>\"\"<\/span>\u00a0time\u00a0.\/copy_file_b\u00a0\u00a0\u00a0<\/span><\/span><\/li>\n
            8. 0.00user\u00a00.02system\u00a00:00.03elapsed\u00a084%CPU\u00a0(0avgtext+0avgdata\u00a0324maxresident)k\u00a0\u00a0<\/span><\/li>\n
            9. 0inputs+480outputs\u00a0(0major+117minor)pagefaults\u00a00swaps\u00a0\u00a0<\/span><\/li>\n<\/ol>\n<\/div>\n

              \u53ef\u4ee5\u770b\u5230\uff0c\u5757\u590d\u5236\u6bd4\u5b57\u7b26\u590d\u5236\uff0c\u6548\u7387\u9ad8\u7684\u591a\uff0c\u8fd9\u4e5f\u540c\u65f6\u8bf4\u660e\uff0c\u9891\u7e41\u7684\u7cfb\u7edf\u8c03\u7528\u9700\u8981\u5de8\u5927\u7684\u5f00\u652f\u3002<\/span><\/p>\n

              \u5728\u8fd9\u91cc\uff0c\u4e5f\u53ef\u4ee5\u7528\u4e0a\u5c42\u51fd\u6570\u5904\u7406\u6587\u4ef6\u590d\u5236\uff1a<\/p>\n

              \n
              \n
              Code<\/strong>\u00a0\u00a0\u00a0View<\/a>Print<\/a><\/div>\n<\/div>\n
                \n
              1. #include\u00a0<stdio.h><\/span>\u00a0\u00a0<\/span><\/span><\/li>\n
              2. #include\u00a0<stdlib.h><\/span>\u00a0\u00a0<\/span><\/span><\/li>\n
              3. \u00a0\u00a0<\/span><\/li>\n
              4. int<\/span>\u00a0main()\u00a0{\u00a0\u00a0<\/span><\/span><\/li>\n
              5. \u00a0\u00a0int<\/span>\u00a0c;\u00a0\u00a0<\/span><\/span><\/li>\n
              6. \u00a0\u00a0FILE<\/span>\u00a0*in,\u00a0*out;\u00a0\u00a0<\/span><\/span><\/li>\n
              7. \u00a0\u00a0<\/span><\/li>\n
              8. \u00a0\u00a0in\u00a0=\u00a0fopen(\"myfile.in\"<\/span>,\u00a0<\/span>\"r\"<\/span>);\u00a0\u00a0<\/span><\/span><\/li>\n
              9. \u00a0\u00a0out\u00a0=\u00a0fopen(\"myfile.out\"<\/span>,\u00a0<\/span>\"w\"<\/span>);\u00a0\u00a0<\/span><\/span><\/li>\n
              10. \u00a0\u00a0<\/span><\/li>\n
              11. \u00a0\u00a0while<\/span>((c\u00a0=\u00a0fgetc(in))\u00a0!=\u00a0EOF)\u00a0{\u00a0\u00a0<\/span><\/span><\/li>\n
              12. \u00a0\u00a0\u00a0\u00a0fputc(c,\u00a0out);\u00a0\u00a0<\/span><\/li>\n
              13. \u00a0\u00a0}\u00a0\u00a0<\/span><\/li>\n
              14. \u00a0\u00a0<\/span><\/li>\n
              15. \u00a0\u00a0exit(0);\u00a0\u00a0<\/span><\/li>\n
              16. }\u00a0\u00a0<\/span><\/li>\n<\/ol>\n<\/div>\n

                \u53ef\u4ee5\u6d4b\u51fa\u590d\u5236\u901f\u5ea6\u4e5f\u6bd4\u8f83\u5feb\uff0c\u8fd9\u662f\u56e0\u4e3a stdio \u5e93\u5728 FILE \u7ed3\u6784\u91cc\u4f7f\u7528\u4e86\u4e00\u4e2a\u5185\u90e8\u7f13\u51b2\u533a\uff0c\u53ea\u6709\u5728\u7f13\u51b2\u533a\u6ee1\u65f6\u624d\u8fdb\u884c\u5e95\u5c42\u7cfb\u7edf\u8c03\u7528\u3002<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

                \u7b2c\u4e00\u6b65\uff1a\u65b0\u5efa\u4e00\u4e2a\u540d\u4e3a myfile.in \u7684\u6587\u4ef6\uff0c\u5e76\u5199\u5165\u4e00\u4e9b\u5185\u5bb9\uff0c\u5c3d\u91cf\u591a\u70b9\u513f\u3002 vi myfile.in \u7b2c\u4e8c […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[227],"tags":[602,89,110],"class_list":["post-1573","post","type-post","status-publish","format-standard","hentry","category-linux","tag-linux","tag-89","tag-110"],"_links":{"self":[{"href":"http:\/\/www.menglanglang.cn\/index.php?rest_route=\/wp\/v2\/posts\/1573","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.menglanglang.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.menglanglang.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.menglanglang.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.menglanglang.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1573"}],"version-history":[{"count":0,"href":"http:\/\/www.menglanglang.cn\/index.php?rest_route=\/wp\/v2\/posts\/1573\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.menglanglang.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1573"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.menglanglang.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1573"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.menglanglang.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1573"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}