{"id":207751,"date":"2025-07-08T08:45:53","date_gmt":"2025-07-08T00:45:53","guid":{"rendered":"https:\/\/server.hk\/cnblog\/207751\/"},"modified":"2025-07-08T08:45:53","modified_gmt":"2025-07-08T00:45:53","slug":"exec-command%ef%bc%9a%e5%bd%93-cmd-%e5%8c%85%e5%90%ab%e7%9d%a1%e7%9c%a0%e6%97%b6%ef%bc%8c%e6%89%ab%e6%8f%8f%e7%a8%8b%e5%ba%8f%e5%9c%a8%e5%91%bd%e4%bb%a4%e5%ae%8c%e6%88%90%e4%b9%8b%e5%89%8d%e5%81%9c","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/207751\/","title":{"rendered":"exec.Command\uff1a\u5f53 cmd \u5305\u542b\u7761\u7720\u65f6\uff0c\u626b\u63cf\u7a0b\u5e8f\u5728\u547d\u4ee4\u5b8c\u6210\u4e4b\u524d\u505c\u6b62"},"content":{"rendered":"<p><b><\/b> <\/p>\n<p>\u5f53\u524d\u4f4d\u7f6e\uff1a <span>&gt;<\/span> <span>&gt;<\/span> <span>&gt;<\/span> <span>&gt;<\/span> <span>exec.Command\uff1a\u5f53 cmd \u5305\u542b\u7761\u7720\u65f6\uff0c\u626b\u63cf\u7a0b\u5e8f\u5728\u547d\u4ee4\u5b8c\u6210\u4e4b\u524d\u505c\u6b62<\/span><\/p>\n<p><span>\u6765\u6e90\uff1astackoverflow<\/span><br \/>\n<span>2024-04-25 12:27:27<\/span><br \/>\n<span><i><\/i>0\u6d4f\u89c8<\/span><br \/>\n<span style=\"cursor: pointer\"><i><\/i>\u6536\u85cf<\/span> <\/p>\n<p>\u77e5\u8bc6\u70b9\u638c\u63e1\u4e86\uff0c\u8fd8\u9700\u8981\u4e0d\u65ad\u7ec3\u4e60\u624d\u80fd\u719f\u7ec3\u8fd0\u7528\u3002\u4e0b\u9762\u7ed9\u5927\u5bb6\u5e26\u6765\u4e00\u4e2aGolang\u5f00\u53d1\u5b9e\u6218\uff0c\u624b\u628a\u624b\u6559\u5927\u5bb6\u5b66\u4e60\u300aexec.Command\uff1a\u5f53 cmd \u5305\u542b\u7761\u7720\u65f6\uff0c\u626b\u63cf\u7a0b\u5e8f\u5728\u547d\u4ee4\u5b8c\u6210\u4e4b\u524d\u505c\u6b62\u300b\uff0c\u5728\u5b9e\u73b0\u529f\u80fd\u7684\u8fc7\u7a0b\u4e2d\u4e5f\u5e26\u5927\u5bb6\u91cd\u65b0\u6e29\u4e60\u76f8\u5173\u77e5\u8bc6\u70b9\uff0c\u6e29\u6545\u800c\u77e5\u65b0\uff0c\u56de\u5934\u770b\u770b\u8bf4\u4e0d\u5b9a\u53c8\u6709\u4e0d\u4e00\u6837\u7684\u611f\u609f\uff01<\/p>\n<p> \u95ee\u9898\u5185\u5bb9<br \/>\n <\/p>\n<pre>package main\n\nimport (\n    \"bufio\"\n    \"fmt\"\n    \"io\"\n    \"log\"\n    \"os\/exec\"\n)\n\nfunc main() {\n    cmd := exec.Command(\"sh\", \"-c\",\n        `for i in $(seq 1 10000); do\n          echo  '{\"Name\": \"Bob\", \"Age\": 32}'\n          sleep $(( ${RANDOM}%5))            # &lt;&lt;&lt;&lt; Stops before reading all lines when uncommented\n        done`,\n    )\n    stdout, err := cmd.StdoutPipe()\n    if err != nil {\n        log.Fatal(err)\n    }\n\n    if err := cmd.Start(); err != nil {\n        log.Fatal(err)\n    }\n\n    printOutput(stdout)\n\n    if err := cmd.Wait(); err != nil {\n        log.Fatal(err)\n    }\n\n}\n\nfunc printOutput(r io.Reader) {\n    scanner := bufio.NewScanner(r)\n    var x = 1\n    for scanner.Scan() {\n        fmt.Println(x, scanner.Text())\n        x++\n    }\n    if err := scanner.Err(); err != nil {\n        fmt.Println(\"reading input:\", err)\n    }\n}\n<\/pre>\n<p>\u5f53 <code>sleep $(( ${random}%5))<\/code> \u88ab\u6ce8\u91ca\u65f6\uff0c\u626b\u63cf\u4eea\u8bfb\u53d6\u6240\u6709 10k \u884c\u5e76\u6253\u5370\u8fd9\u4e9b\u884c\u3002\u4f46\u662f\uff0c\u5f53\u53d6\u6d88\u6ce8\u91ca\u65f6\uff0c\u7a0b\u5e8f\u4f1a\u5728\u6253\u5370\u51fa\u6240\u6709\u884c\u4e4b\u524d\u9000\u51fa\u3002\u626b\u63cf\u4eea\u53ef\u80fd\u4f1a\u8fc7\u65e9\u9000\u51fa\uff0c\u56e0\u4e3a\u5b83\u5c06\u7a7a\u7ba1\u9053\u89e3\u91ca\u4e3a eof\u3002<\/p>\n<p>\u6709\u6ca1\u6709\u529e\u6cd5\u5b8c\u5168\u8bfb\u53d6\u547d\u4ee4\u7684\u6807\u51c6\u8f93\u51fa\uff0c\u76f4\u5230\u5b83\u9000\u51fa\uff08\u5e76\u4e14\u4e0d\u4f1a\u63d0\u524d\u7ec8\u6b62\uff09\uff1f<\/p>\n<p> <\/p>\n<h2>\u89e3\u51b3\u65b9\u6848<\/h2>\n<p> <\/p>\n<p>\u60a8\u7684\u4ee3\u7801\u4e0d\u662f\u6709\u6548\u7684 <code>sh<\/code> \u8bed\u6cd5\uff0c\u4f46\u671f\u671b <code>sh<\/code> \u4e3a <code>bash<\/code>\u3002\u867d\u7136\u8fd9\u5728\u67d0\u4e9b\u7cfb\u7edf\u4e0a\u662f\u76f8\u540c\u7684\uff0c\u4f46\u5728\u5176\u4ed6\u7cfb\u7edf\u4e0a\u5219\u4e0d\u7136\u3002\u5728\u8fd9\u4e9b\u65b9\u9762\uff0c\u5b83\u4e0e\u4ee5\u4e0b\u5185\u5bb9\u4e0d\u540c\uff1a<\/p>\n<pre>arithmetic expression: expecting primary: \" %5\"`<\/pre>\n<p>\u4eca\u5929\u5173\u4e8e\u300aexec.Command\uff1a\u5f53 cmd \u5305\u542b\u7761\u7720\u65f6\uff0c\u626b\u63cf\u7a0b\u5e8f\u5728\u547d\u4ee4\u5b8c\u6210\u4e4b\u524d\u505c\u6b62\u300b\u7684\u5185\u5bb9\u4ecb\u7ecd\u5c31\u5230\u6b64\u7ed3\u675f\uff0c\u5982\u679c\u6709\u4ec0\u4e48\u7591\u95ee\u6216\u8005\u5efa\u8bae\uff0c\u53ef\u4ee5\u5728\u516c\u4f17\u53f7\u4e0b\u591a\u591a\u56de\u590d\u4ea4\u6d41\uff1b\u6587\u4e2d\u82e5\u6709\u4e0d\u6b63\u4e4b\u5904\uff0c\u4e5f\u5e0c\u671b\u56de\u590d\u7559\u8a00\u4ee5\u544a\u77e5\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5f53\u524d\u4f4d\u7f6e\uff1a &gt; &gt; &#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-207751","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207751","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=207751"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207751\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=207751"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=207751"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=207751"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}