{"id":1329,"date":"2025-01-19T21:24:20","date_gmt":"2025-01-19T13:24:20","guid":{"rendered":"http:\/\/gzxingyu.cloud\/?p=1329"},"modified":"2025-01-19T21:24:21","modified_gmt":"2025-01-19T13:24:21","slug":"01-linux%e6%96%87%e4%bb%b6%e6%8f%8f%e8%bf%b0%e7%ac%a6","status":"publish","type":"post","link":"http:\/\/gzxingyu.cloud\/index.php\/2025\/01\/19\/01-linux%e6%96%87%e4%bb%b6%e6%8f%8f%e8%bf%b0%e7%ac%a6\/","title":{"rendered":"01. Linux\u6587\u4ef6\u63cf\u8ff0\u7b26"},"content":{"rendered":"

\u4e00\u3001 \u6587\u4ef6\u63cf\u8ff0\u7b26\u7b80\u4ecb<\/h3>\n

\u6587\u4ef6\u63cf\u8ff0\u7b26\u662f\u4e00\u4e2a\u975e\u8d1f\u6574\u6570\uff0c\u5185\u6838\u9700\u8981\u901a\u8fc7\u8fd9\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u624d\u53ef\u4ee5\u8bbf\u95ee\u6587\u4ef6
\n\u6587\u4ef6\u63cf\u8ff0\u7b26\u597d\u6bd4\u4e00\u672c\u4e66\u7684\u76ee\u5f55\uff08\u7d22\u5f15\uff09\uff0c\u901a\u8fc7\u8fd9\u4e2a\u7d22\u5f15\u53ef\u4ee5\u627e\u5230\u9700\u8981\u7684\u5185\u5bb9
\n\u5728Linux\u7cfb\u7edf\u4e2d\u5185\u6838\u9ed8\u8ba4\u4e3a\u6bcf\u4e2a\u8fdb\u7a0b\u521b\u5efa\u4e09\u4e2a\u6807\u51c6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\uff1a
\n0\uff08\u6807\u51c6\u8f93\u5165\uff0c\u952e\u76d8\u8f93\u5165\u7684\uff09\u30011\uff08\u6807\u51c6\u8f93\u51fa\uff0c\u5c4f\u5e55\u8f93\u51fa\u7684\uff09\u3001 2\uff08\u6807\u51c6\u9519\u8bef\uff09
\n\u901a\u8fc7\u67e5\u770b \/proc\/==PID==\/fd \u76ee\u5f55\u4e0b\u7684\u6587\u4ef6\uff0c\u5c31\u53ef\u4ee5\u67e5\u770b\u6bcf\u4e2a\u8fdb\u7a0b\u62e5\u6709\u7684\u6240\u6709\u6587\u4ef6\u63cf\u8ff0\u7b26
\n\u4f8b\u5982\uff1a \u67e5\u770b\u5f53\u524dshell \u7684\u6587\u4ef6\u63cf\u8ff0\u7b26<\/p>\n

ll \/proc\/$$\/fd\n<\/code><\/pre>\n
\"Pasted<\/div>
\n255\u662f\u4e00\u4e2a\u5c0f\u6280\u5de7\uff0cbash\u7528\u4e8e\u5728\u91cd\u5b9a\u5411\u65f6\u4fdd\u7559\u8fd9\u4e9b\u526f\u672c.<\/p>\n
\u5f53\u6253\u5f00\u6587\u4ef6\u65f6\uff0c\u7cfb\u7edf\u5185\u6838\u4f1a\u4e3a\u7279\u5b9a\u7684\u8fdb\u7a0b\u81ea\u52a8\u521b\u5efa\u5bf9\u5e94\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26
\n\u4f8b\u5b50\uff1a<\/p>\n
# tail\u6253\u5f00\u4e00\u4e2a\u6587\u4ef6 \ntail -f flag\n# \u83b7\u53d6tail\u8fdb\u7a0bPID\npidof tail \n# \u67e5\u770btail\u8fdb\u7a0b\u521b\u5efa\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26 \nll \/proc\/98\/fd\n<\/code><\/pre>\n
\"Pasted<\/div>
\n
\"Pasted<\/div>
\n\u83b7\u53d6pid\uff0c\u7136\u540e\u67e5\u770b\/proc\/98\/fd   pid=98<\/p>\n
\u53ef\u4ee5\u770b\u5230\u5b58\u5728\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26 3 \u7d22\u5f15\u6253\u5f00\u7684 \/root\/flag \u6587\u4ef6<\/p>\n
\u4e8c\u3001\u6807\u51c6\u6587\u4ef6\u63cf\u8ff0\u7b26<\/h3>\n
Linux\u7cfb\u7edf\u5c06\u6240\u6709\u8bbe\u5907\u90fd\u5f53\u4f5c\u6587\u4ef6\u6765\u5904\u7406\uff0c\u800cLinux\u7528\u6587\u4ef6\u63cf\u8ff0\u7b26\u6765\u6807\u8bc6\u6bcf\u4e2a\u6587\u4ef6\u5bf9\u8c61\u3002\u5f53Linux\u542f \u52a8\u7684\u65f6\u5019\u4f1a\u9ed8\u8ba4\u6253\u5f00\u4e09\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002
\n\u6587\u4ef6\u63cf\u8ff0\u7b26     \u7f29\u5199           \u63cf\u8ff0                  \u9ed8\u8ba4\u8bbe\u5907
\n0                  STDIN        \u6807\u51c6\u8f93\u5165           \u9ed8\u8ba4\u8bbe\u5907\u952e\u76d8
\n1                  STDOUT    \u6807\u51c6\u8f93\u51fa           \u9ed8\u8ba4\u8bbe\u5907\u663e\u793a\u5668
\n2                  STDERR     \u6807\u51c6\u9519\u8bef\u8f93\u51fa    \u9ed8\u8ba4\u8bbe\u5907\u663e\u793a\u5668<\/p>\n
\u6211\u4eec\u4e0e\u8ba1\u7b97\u673a\u4e4b\u95f4\u7684\u4ea4\u4e92\u662f\u6211\u53ef\u4ee5\u8f93\u5165\u4e00\u4e9b\u6307\u4ee4\u4e4b\u540e\u5b83\u7ed9\u6211\u4e00\u4e9b\u8f93\u51fa\u3002
\n\u6587\u4ef6\u63cf\u8ff0\u7b260\uff1a\u7406\u89e3\u4e3a\u6211\u548c\u8ba1\u7b97\u673a\u4ea4\u4e92\u65f6\u7684\u8f93\u5165\uff0c\u800c\u8fd9\u4e2a\u8f93\u5165\u9ed8\u8ba4\u662f\u6307\u5411\u952e\u76d8\u7684\uff1b
\n\u6587\u4ef6\u63cf\u8ff0\u7b261\uff1a\u7406\u89e3\u4e3a\u6211\u548c\u8ba1\u7b97\u673a\u4ea4\u4e92\u65f6\u7684\u8f93\u51fa\uff0c\u800c\u8fd9\u4e2a\u8f93\u51fa\u9ed8\u8ba4\u662f\u6307\u5411\u663e\u793a\u5668\u7684\uff1b
\n\u6587\u4ef6\u63cf\u8ff0\u7b262\uff1a\u7406\u89e3\u4e3a\u6211\u548c\u8ba1\u7b97\u673a\u4ea4\u4e92\u65f6\uff0c\u8ba1\u7b97\u673a\u51fa\u73b0\u9519\u8bef\u65f6\u7684\u8f93\u51fa\uff0c\u800c\u8fd9\u4e2a\u8f93\u51fa\u9ed8\u8ba4\u662f\u548c\u6587\u4ef6\u63cf\u8ff0\u7b261\u6307\u5411\u4e00\u4e2a\u4f4d\u7f6e\uff1b<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e00\u3001 \u6587\u4ef6\u63cf\u8ff0\u7b26\u7b80\u4ecb \u6587\u4ef6\u63cf\u8ff0\u7b26\u662f\u4e00\u4e2a\u975e\u8d1f\u6574\u6570\uff0c\u5185\u6838\u9700\u8981\u901a\u8fc7\u8fd9\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u624d\u53ef\u4ee5\u8bbf\u95ee\u6587\u4ef6 \u6587\u4ef6\u63cf\u8ff0\u7b26\u597d\u6bd4\u4e00\u672c\u4e66 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[48,9],"tags":[],"class_list":["post-1329","post","type-post","status-publish","format-standard","hentry","category-linuxshell","category-9"],"_links":{"self":[{"href":"http:\/\/gzxingyu.cloud\/index.php\/wp-json\/wp\/v2\/posts\/1329","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/gzxingyu.cloud\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/gzxingyu.cloud\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/gzxingyu.cloud\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/gzxingyu.cloud\/index.php\/wp-json\/wp\/v2\/comments?post=1329"}],"version-history":[{"count":1,"href":"http:\/\/gzxingyu.cloud\/index.php\/wp-json\/wp\/v2\/posts\/1329\/revisions"}],"predecessor-version":[{"id":1330,"href":"http:\/\/gzxingyu.cloud\/index.php\/wp-json\/wp\/v2\/posts\/1329\/revisions\/1330"}],"wp:attachment":[{"href":"http:\/\/gzxingyu.cloud\/index.php\/wp-json\/wp\/v2\/media?parent=1329"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/gzxingyu.cloud\/index.php\/wp-json\/wp\/v2\/categories?post=1329"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/gzxingyu.cloud\/index.php\/wp-json\/wp\/v2\/tags?post=1329"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}