{"id":7049,"date":"2022-08-22T22:53:28","date_gmt":"2022-08-22T14:53:28","guid":{"rendered":"http:\/\/123.57.164.21\/?p=7049"},"modified":"2022-08-22T23:00:04","modified_gmt":"2022-08-22T15:00:04","slug":"linux%e8%af%be%e5%a0%82%e7%ac%94%e8%ae%b03","status":"publish","type":"post","link":"https:\/\/92it.top\/?p=7049","title":{"rendered":"Linux\u8bfe\u5802\u7b14\u8bb0(3)"},"content":{"rendered":"\n

\u7279\u6b8a\u6743\u9650\uff1a\u5f3a\u5236\u4f4d\uff08suid\uff09\uff0c\u5192\u9669\u4f4d\uff08sgid\uff09\uff0c\u9ecf\u8d34\u4f4d\uff08stick\uff09<\/strong><\/p>\n\n\n\n

\n\n\n\n
\"\"<\/figure><\/div>\n\n\n\n
  • \u8bbe\u7f6e\u7279\u6b8a\u6743\u9650<\/li><\/ul>\n\n\n\n
    a)\t\u7b26\u53f7\u6cd5\uff1asetuid=u+s\uff1bsetgid=g+s\uff1bstick=o+t\nb)\t\u6570\u503c\u6cd5\uff1asetuid=4\uff1bsetgid=2\uff1bstick=1  \u5982\uff1achmod  2770 \u76ee\u5f55<\/pre>\n\n\n\n
    • \u5f71\u54cd\u9ed8\u8ba4\u6587\u4ef6\u6743\u9650\u7684\u56e0\u7d20<\/li><\/ul>\n\n\n\n
      (1)\t\u521b\u5efa\u7684\u662f\u6587\u4ef6\u8fd8\u662f\u76ee\u5f55\n(2)\t\u4f7f\u7528\u7684\u662froot\u7528\u6237\u8fd8\u662f\u666e\u901a\u7528\u6237\n(3)\t\u65b0\u76ee\u5f55\u6743\u9650\u503c0777\uff1b\u65b0\u6587\u4ef6\u6743\u9650\u52360666\n(4)\tumask\u503c\uff1a\u9650\u5236\u521d\u59cb\u8bbe\u7f6e\u7684\u6743\u9650\uff0c\u6e05\u9664\u521b\u5efa\u7684\u65b0\u6587\u4ef6\u548c\u65b0\u76ee\u5f55\u7684\u6743\u9650\n(5)\troot\u7528\u6237umask\u9ed8\u8ba40022\uff1b\u666e\u901a\u7528\u6237umask\u503c\u9ed8\u8ba40002\n(6)\tumask\u503c\u8bbe\u7f6e\uff1axxxx\uff1b\u5173\u95ed\u7ec8\u7aef\uff0c\u91cd\u65b0\u5f00\u542f\u7ec8\u7aef\u8bbe\u7f6e\u7684\u65b0umask\u503c\u5931\u6548\n(7)\t\u521b\u5efa\u65b0\u6587\u4ef6\u6743\u9650 = \u65b0\u6587\u4ef6\u6743\u9650\u52360666 - umask\u503c \u4f8b\u5982\u666e\u901a\u7528\u6237\u521b\u5efa\u6587\u4ef6\uff1a0666 - 0002 = 0664\n<\/pre>\n\n\n\n
      • Bash shell \u7528\u6237\u53ef\u4ee5\u5728\u7528\u6237\u4e3b\u76ee\u5f55\u7684~\/.bashrc\u6587\u4ef6\u4e2d\u8986\u76d6\u7cfb\u7edf\u9ed8\u8ba4\u503c\uff0c\u91cd\u65b0\u767b\u5f55\u7ec8\u7aef\u751f\u6548<\/li><\/ul>\n\n\n\n
        \u4e3e\u4f8b\uff1aecho \u201cumask 0022\u201d >>~\/.bashrc<\/pre>\n\n\n\n
        \u8bfe\u5802\u7ec3\u4e60<\/strong><\/p>\n\n\n\n
        \n\n\n\n
        (1)\troot\u7528\u6237\u521b\u5efa3\u4e2a\u65b0\u7528\u6237tech1\uff0ctech2\uff0cdatabase1\uff0c\u5bc6\u7801redhat123\u548c1\u4e2a\u7ec4sd\n[root@localhost ~]# useradd tech1\n[root@localhost ~]# useradd tech2\n[root@localhost ~]# useradd database1\n[root@localhost ~]# echo redhat123 | passwd --stdin tech1\n[root@localhost ~]# echo redhat123 | passwd --stdin tech2\n[root@localhost ~]# echo redhat123 | passwd --stdin database1\n[root@localhost ~]# groupadd sd\n\n(2)\troot\u7528\u6237\u521b\u5efa\u540d\u4e3a\/home\/sd\u7684\u76ee\u5f55\uff0c\u4e14\u5c06\/home\/sd\u7684\u6240\u5c5e\u7ec4\u4fee\u6539\u4e3asd\n[root@localhost ~]# mkdir \/home\/sd\n[root@localhost ~]# chown :sd \/home\/sd\n\n(3)\troot\u7528\u6237\u5c06\u7528\u6237tech1\uff0ctech2\u52a0\u5165\u7ec4sd\n[root@localhost ~]# gpasswd -a tech1 sd\n[root@localhost ~]# gpasswd -a tech2 sd\n\n(4)\ttech1\u7528\u6237\u5c1d\u8bd5\u5728\/home\/sd\u76ee\u5f55\u4e2d\u521b\u5efa1\u4e2a\u6587\u4ef6techf1.txt\uff0c\u89c2\u5bdf\u73b0\u8c61\n\u4e0d\u80fd\n\n(5)\troot\u7528\u6237\u5bf9\/home\/sd\u76ee\u5f55\u8bbe\u7f6e\u5192\u9669\u4f4d\uff0c\u4e14\u76ee\u5f55\u6240\u6709\u8005\u548c\u7ec4\u5177rwx\u6743\u9650\uff0c\u5176\u5b83\u7528\u6237\u65e0\u6743\u9650\n[root@localhost ~]# chmod 2770 \/home\/sd\/\n\n(6)\ttech1\u7528\u6237\u518d\u6b21\u5c1d\u8bd5\u5728\/home\/sd\u4e2d\u521b\u5efatechf1.txt\u6587\u4ef6\n[tech1@localhost ~]$ touch \/home\/sd\/techf1.txt\n\n(7)\ttech2\u7528\u6237\u5c1d\u8bd5\u5411\/home\/sd\/techf1.txt\u6587\u4ef6\u4e2d\u6dfb\u52a0hello world\n[tech2@localhost ~]$ vim \/home\/sd\/techf1.txt\n\n(8)\tdatabase1\u7528\u6237\u662f\u5426\u53ef\u4ee5\u4f7f\u7528vim\u4fee\u6539\u6587\u4ef6\/home\/sd\/techf1.txt\uff0c\u89c2\u5bdf\u73b0\u8c61\n\u4e0d\u80fd\n\n(9)\troot\u7528\u6237\u5c06\/home\/sd\u7684\u5176\u5b83\u4f4d\u6743\u9650\u8bbe\u7f6e\u4e3arwx\uff0c\u4e14\u8bbe\u7f6e\u9ecf\u8d34\u4f4d\uff08\u9ecf\u8d34\u4f4d\u4f1a\u5f71\u54cd\u7b2c10\u9898\u7ed3\u679c\uff09\n[root@localhost ~]# chmod 3777 \/home\/sd\/\n\n(10)\tdatabase1\u7528\u6237\u6b64\u65f6\u662f\u5426\u53ef\u4ee5\u4fee\u6539\u6587\u4ef6\/home\/sd\/techf1.txt\uff0c\u89c2\u5bdf\u73b0\u8c61\n<\/pre>\n\n\n\n
        ACL\u6982\u5ff5<\/strong><\/p>\n\n\n\n
        \n\n\n\n
        • \u9664\u6587\u4ef6\u6240\u6709\u8005\u548c\u6587\u4ef6\u7684\u7ec4\u4ece\u5c5e\u5173\u7cfb\u4e4b\u5916\u7684\u7528\u6237\u548c\u7ec4\u88ab\u79f0\u4e3a\u6307\u5b9a\u7528\u6237\u548c\u6307\u5b9a\u7ec4<\/li>
        • ACL\u8bbf\u95ee\u63a7\u5236\u5217\u8868\u6982\u5ff5\uff1a\u4e3a\u6307\u5b9a\u7684\u7528\u6237\u548c\u6307\u5b9a\u7684\u7ec4\u4ee5\u4e0d\u540c\u7684\u6587\u4ef6\u6743\u9650\u6765\u8bbf\u95ee\u6587\u4ef6<\/li>
        • ACL\u6743\u9650\u89e3\u91ca\u5982\u56fe<\/li><\/ul>\n\n\n\n
          \"\"<\/figure><\/div>\n\n\n\n
          \u7528\u6237\uff1a\u663e\u793a\u7528\u6237acl\u8bbe\u7f6e\uff0c\u4e0e\u6807\u51c6\u7684\u7528\u6237\u6587\u4ef6\u8bbe\u7f6e\u76f8\u540c\uff1brwx\n\u7ec4\uff1a \u663e\u793a\u5f53\u524dacl\u63a9\u7801\u8bbe\u7f6e\uff0c\u800c\u4e0d\u662f\u7ec4\u6240\u6709\u8005\u8bbe\u7f6e\uff1brw\n\u5176\u5b83\uff1a\u663e\u793a\u5176\u5b83acl\u8bbe\u7f6e\uff0c\u4e0e\u6807\u51c6\u7684\u5176\u5b83\u6587\u4ef6\u8bbe\u7f6e\u76f8\u540c\uff1b---\n\u6ce8\u610f\uff1achmod\u66f4\u6539\u5177\u6709acl\u7684\u6587\u4ef6\u7684\u7ec4\u6743\u9650\u65f6\uff0c\u66f4\u6539\u7684\u4e0d\u662f\u7ec4\u6240\u6709\u8005\u6743\u9650\uff0c\u5b9e\u9645\u66f4\u6539\u7684\u662facl\u63a9\u7801\n<\/pre>\n\n\n\n
          \u6587\u4ef6ACL<\/strong><\/p>\n\n\n\n
          \n\n\n\n
          \"\"<\/figure><\/div>\n\n\n\n
          \u2460\u524d\u4e09\u6761\u6ce8\u91ca\uff1a\u6587\u4ef6\u540d\uff1b\u6587\u4ef6\u6240\u6709\u8005\uff1b\u7ec4\u6240\u6709\u8005\uff08operators\uff09\n\u2461 \u7528\u6237\u6761\u76ee\uff1a\u6587\u4ef6\u6240\u6709\u8005\u6743\u9650\uff0cuser\u7684\u6743\u9650rwx\uff1b\u6307\u5b9a\u7528\u6237\u6743\u9650\uff0cconsultant3\u7528\u6237\u6ca1\u6709\u4efb\u4f55\u6743\u9650\uff1b\u6307\u5b9a\u7528\u6237\u6743\u9650\uff0cUID=1005\u7684\u6743\u9650rwx\uff0c\u63a9\u7801\u5c06\u6709\u6548\u6743\u9650\u9650\u5236\u4e3arw\n\u2462 \u7ec4\u6761\u76ee\uff1a\u7ec4\u6240\u6709\u8005\u6743\u9650\uff0coperators\u6743\u9650rwx\uff0c\u63a9\u7801\u5c06\u6709\u6548\u6743\u9650\u9650\u5236\u4e3arw\uff1b\u6307\u5b9a\u7ec4\u6743\u9650\uff0cconsultant1\u6743\u9650r\uff1b\u6307\u5b9a\u7ec4\u6743\u9650\uff0cGID=2210\u6743\u9650rwx\uff0c\u63a9\u7801\u5c06\u6709\u6548\u6743\u9650\u9650\u5236\u4e3arw\n\u2463 \u63a9\u7801\n\u2464 \u5176\u5b83\n<\/pre>\n\n\n\n
          \u76ee\u5f55ACL<\/strong><\/p>\n\n\n\n
          \n\n\n\n
          \"\"<\/figure><\/div>\n\n\n\n
          \u2460 flag\uff1a\u5982\u679c\u5b58\u5728\u4efb\u4f55\u5176\u5b83\u7279\u6b8a\u6743\u9650setuid\uff0csetgid\uff0csticky\uff0c\u5c31\u4f1a\u51fa\u73b0\u7b2c\u56db\u884c\u6ce8\u91ca\u663e\u793a\u6240\u8bbe\u7f6e\u7684\u6807\u5fd7\uff0c\u672c\u4f8b\u4e3asetgid<\/pre>\n\n\n\n
          ACL\u63a9\u7801<\/strong><\/p>\n\n\n\n
          \n\n\n\n
          • 1) \u63a9\u7801\u5b9a\u4e49\u53ef\u4ee5\u6388\u4e88\u6307\u5b9a\u7528\u6237\uff0c\u7ec4\u6240\u6709\u8005\u548c\u6307\u5b9a\u7ec4\u7684\u6700\u5927\u6743\u9650<\/li>
          • 2) \u5b83\u4e0d\u9650\u5236\u6587\u4ef6\u6240\u6709\u8005\u548c\u5176\u5b83\u7528\u6237\u7684\u6743\u9650<\/li>
          • 3) \u9ed8\u8ba4\u7cfb\u7edf\u81ea\u52a8\u8ba1\u7b97\u63a9\u7801<\/li>
          • 4) \u53ef\u4ee5\u4f7f\u7528setfacl \u8bbe\u7f6e\u63a9\u7801<\/li>
          • 5) \u9ed8\u8ba4\u6dfb\u52a0\uff0c\u4fee\u6539\u6216\u5220\u9664\u4efb\u4f55\u53d7\u5f71\u54cd\u7684ACL\uff08\u6307\u5b9a\u7528\u6237\u6216\u7ec4\u6240\u6709\u8005\u6216\u6307\u5b9a\u7ec4\uff09\u65f6\uff0c\u4f1a\u91cd\u65b0\u8ba1\u7b97\u63a9\u7801<\/li><\/ul>\n\n\n\n
            ACL\u6743\u9650\u4f18\u5148\u7ea7<\/strong><\/p>\n\n\n\n
            \n\n\n\n
            • 1) \u5982\u679c\u4ee5\u6587\u4ef6\u6240\u6709\u8005\u8eab\u4efd\u8fd0\u884c\u8fdb\u7a0b\uff0c\u5219\u5e94\u7528\u6587\u4ef6\u7684\u7528\u6237ACL\u6743\u9650<\/li>
            • 2) \u5982\u679c\u4ee5\u6307\u5b9a\u7528\u6237ACL\u6761\u76ee\u4e2d\u5217\u51fa\u7684\u7528\u6237\u8eab\u4efd\u8fd0\u884c\u8fdb\u7a0b\uff0c\u5219\u5e94\u7528\u6307\u5b9a\u7528\u6237ACL\u6743\u9650\uff08\u53ea\u8981\u63a9\u7801\u5141\u8bb8\uff09<\/li>
            • 3) \u5982\u679c\u4ee5\u4e0e\u6587\u4ef6\u7684\u7ec4\u6240\u6709\u8005\u76f8\u5339\u914d\u7684\u7ec4\u8eab\u4efd\u8fd0\u884c\u8fdb\u7a0b\uff0c\u6216\u8005\u4ee5\u6307\u5b9a\u7ec4ACL\u6761\u76ee\u7684\u7ec4\u8eab\u4efd\u8fd0\u884c\u8fdb\u7a0b\uff0c\u5219\u5e94\u7528\u76f8\u5339\u914d\u7684ACL\u6743\u9650\uff08\u53ea\u8981\u63a9\u7801\u8fd0\u884c\uff09<\/li><\/ul>\n\n\n\n
              \u66f4\u6539ACL\u6587\u4ef6\u6743\u9650\u7ec3\u4e60<\/strong><\/p>\n\n\n\n
              \n\n\n\n
              setfacl  -m  u:natasha:rw   file\nsetfacl  -m  u::rw  file\nsetfacl  -m  g:group1:rw   file\nsetfacl  -m  g::rw  file \nsetfacl  -m  u::rwx,g:group1:rw,o::r  file\nsetfacl  -m  m::r    file\nsetfacl  -x    u:natasha  file   \/\/ \u5220\u9664\u6307\u5b9a\u7528\u6237\u548c\u6307\u5b9a\u7ec4\uff0c\u4efb\u4f55\u5176\u5b83\u73b0\u6709ACL\u6761\u76ee\u5747\u4fdd\u6301\u6d3b\u52a8\nsetfacl  -b    file              \/\/ \u5220\u9664\u6587\u4ef6\u6216\u76ee\u5f55\u7684\u6240\u6709ACL\u6761\u76ee\ngetfacl  file1  |  setfacl  --set-file=- file2        \/\/ file1\u7684\u6743\u9650\u7ed9\u6587\u4ef6file2  \n<\/pre>\n\n\n\n
              \u8bfe\u5802\u7ec3\u4e60<\/strong><\/p>\n\n\n\n
              \n\n\n\n
              1)\troot\u7528\u6237\u5728\/tmp\u521b\u5efa\u6587\u4ef6f1\uff0cf1\u5185\u5bb9\u662f12345\uff0c\u67e5\u770b\u6587\u4ef6f1\u6743\u9650\n[root@localhost ~]#echo  12345 >>\/tmp\/f1\n2)\troot\u7528\u6237\u4f7f\u7528acl\u8bbe\u7f6e\u7528\u6237u1\u53ef\u4ee5\u5bf9\u6587\u4ef6f1\u8fdb\u884c\u8bfb\u53d6\u548c\u7f16\u8f91\uff08u1\u7528\u6237\u5982\u679c\u4e0d\u5b58\u5219\u521b\u5efa\uff09\uff0c\u9a8c\u8bc1\n[root@localhost ~]# setfacl -m u:u1:rw \/tmp\/f1\n3)\troot\u7528\u6237\u4f7f\u7528acl\u8bbe\u7f6e\u7528\u6237u2\u5bf9\u6587\u4ef6f1\u6ca1\u6709\u4efb\u4f55\u6743\u9650\uff08u2\u7528\u6237\u5982\u679c\u4e0d\u5b58\u5219\u521b\u5efa\uff09\uff0c\u9a8c\u8bc1\n[root@localhost ~]# setfacl -m u:u2:--- \/tmp\/f1\n4)\troot\u7528\u6237\u6267\u884c\u8bef\u64cd\u4f5c\uff1achmod g-r \/tmp\/f1\uff0cu1,u2\u662f\u5426\u53ef\u4ee5\u8bfb\u6587\u4ef6f1\uff0cu1\u662f\u5426\u53ef\u4ee5\u7f16\u8f91\u6587\u4ef6f1\uff1f\nu1\u548cu2\u4e0d\u53ef\u4ee5\u8bfb\u53d6f1\uff1bu1\u53ef\u4ee5\u4fee\u6539f1\n5)\troot\u7528\u6237\u518d\u6b21\u6267\u884c\u8bef\u64cd\u4f5c\uff1achmod g-w \/tmp\/f1\uff0cu1,u2\u662f\u5426\u53ef\u4ee5\u8bfb\u6587\u4ef6f1\uff0cu1\u662f\u5426\u53ef\u4ee5\u4fee\u6539\u6587\u4ef6f1\uff1f\nu1\u548cu2\u53ef\u4ee5\u8bfb\u53d6f1\uff1bu1\u4e0d\u53ef\u4ee5\u4fee\u6539f1\n6)\troot\u7528\u6237\u6267\u884c\u64cd\u4f5c\uff1asetfacl  -m  m::r  \/tmp\/f1\uff0cu1,u2\u662f\u5426\u53ef\u4ee5\u8bfb\u53d6\u6587\u4ef6f1?\nu1\u53ef\u4ee5\u8bfb\u53d6f1\uff0cu2\u4e0d\u53ef\u4ee5\u8bfb\u53d6f1\n<\/pre>\n\n\n\n
              \u8fdb\u7a0b\u6982\u8ff0<\/strong><\/p>\n\n\n\n
              \n\n\n\n
              • \u8fdb\u7a0b\u6982\u5ff5\uff1a\u8fdb\u7a0b\u662f\u5df2\u542f\u52a8\u7684\u53ef\u6267\u884c\u7a0b\u5e8f\uff0c\u5360\u7528\u7cfb\u7edf\u8d44\u6e90\uff08\u5982CPU\uff0c\u5185\u5b58\u7b49\uff09\uff1b\u8fdb\u7a0b\u8bf7\u6c42\u8d44\u6e90\u65f6\u8fdb\u5165\u7761\u7720\u72b6\u6001\uff0c\u5305\u62ec\u7b49\u5f85\u78c1\u76d8\uff0c\u7f51\u7edc\uff0c\u7528\u6237\u8f93\u5165\u7b49\uff1b\u8fdb\u7a0b\u5b8c\u6210\u4efb\u52a1\u540e\u6b63\u5e38\u60c5\u51b5\u4e0b\u81ea\u52a8\u8fdb\u884c\u201c\u81ea\u6740\u201d\uff0c\u91ca\u653e\u7cfb\u7edf\u8d44\u6e90<\/li>
              • \u7236\u8fdb\u7a0b\u6982\u5ff5\uff1a\u73b0\u6709\u7684\u8fdb\u7a0b\uff08\u7236\uff09\u590d\u5236\u81ea\u5df1\u7684\u5730\u5740\u7a7a\u95f4(fork)\u521b\u5efa1\u4e2a\u65b0\u7684\u5b50\u8fdb\u7a0b\uff1b\u6bcf\u4e2a\u65b0\u7684\u8fdb\u7a0b\u5206\u914d\u6709\u4e00\u4e2a\u552f\u4e00\u8fdb\u7a0bID\uff08PID\uff09\uff1b\u4efb\u4f55\u8fdb\u7a0b\u90fd\u53ef\u4ee5\u521b\u5efa\u5b50\u8fdb\u7a0b\uff1b\u6240\u6709\u8fdb\u7a0b\u90fd\u662f\u7b2c\u4e00\u4e2a\u7cfb\u7edf\u8fdb\u7a0b\u7684\u540e\u4ee3\uff1bRHEL8\u7684\u7b2c\u4e00\u4e2a\u7cfb\u7edf\u8fdb\u7a0b\u662fsystemd<\/li>
              • \u5b50\u8fdb\u7a0b\u6982\u5ff5\uff1a\u5b50\u8fdb\u7a0b\u6267\u884c\u81ea\u5df1\u7684\u7a0b\u5e8f\u4ee3\u7801\uff0c\u7236\u8fdb\u7a0b\u5728\u5b50\u8fdb\u7a0b\u8fd0\u884c\u671f\u95f4\u5904\u4e8e\u7761\u7720\u72b6\u6001\uff0c\u8bbe\u7f6e\u4e00\u4e2a\u5728\u5b50\u8fdb\u7a0b\u5b8c\u6210\u65f6\u53d1\u51fa\u4fe1\u53f7\u7684\u8bf7\u6c42\uff1b\u5b50\u8fdb\u7a0b\u9000\u51fa\u65f6\u4f1a\u5411\u5176\u7236\u8fdb\u7a0b\u53d1\u51fa\u4fe1\u53f7\uff0c \u91ca\u653e\u9664PID\u4e4b\u5916\u7684\u6240\u6709\u8d44\u6e90\u3002\u7236\u8fdb\u7a0b\u6536\u5230\u5b50\u8fdb\u7a0b\u7684\u4fe1\u53f7\u88ab\u5524\u9192\uff0c\u6e05\u7406\u5b50\u8fdb\u7a0b\u7684\u6761\u76ee\uff0c\u91ca\u653e\u8fdb\u5b50\u8fdb\u7a0b\u7684\u6700\u540e\u4e00\u4e2a\u8d44\u6e90\uff0c\u7136\u540e\u7236\u8fdb\u7a0b\u7ee7\u7eed\u6267\u884c\u81ea\u5df1\u7684\u7a0b\u5e8f\u4ee3\u7801<\/li>
              • \u50f5\u5c38\u8fdb\u7a0b\uff1a\u8fdb\u7a0b\u5e94\u8be5\u7ed3\u675f\uff0c\u4f46\u6ca1\u6709\u7ed3\u675f\uff0c\u4f9d\u7136\u5360\u7528\u7cfb\u7edf\u8d44\u6e90<\/li><\/ul>\n\n\n\n
                \u8fdb\u7a0b\u547d\u4ee4<\/strong><\/p>\n\n\n\n
                \n\n\n\n
                1)\tps \u547d\u4ee4\uff1a\u7528\u4e8e\u67e5\u770b\u7cfb\u7edf\u7684\u8fdb\u7a0b\n2)\tpidof \u547d\u4ee4\uff1a\u7528\u4e8e\u67e5\u8be2\u67d0\u4e2a\u6307\u5b9a\u670d\u52a1\u8fdb\u7a0b\u7684PID\u503c\uff1b\u4e3e\u4f8b\uff1apidof  sshd\n<\/pre>\n\n\n\n
                \u8fdb\u7a0b\u63a7\u5236<\/strong><\/p>\n\n\n\n
                \n\n\n\n
                1)\tjobs\uff1a\u67e5\u770b\u540e\u53f0\u8fdb\u7a0b\n2)\tcrtl+z\uff1a\u6682\u505c\u524d\u53f0\u6b63\u5728\u8fd0\u884c\u7684\u8fdb\u7a0b\n3)\tbg  %\u4f5c\u4e1a\u7f16\u53f7\uff1a\u5c06\u540e\u53f0\u6682\u505c\u7684\u8fdb\u7a0b\u6062\u590d\u5728\u540e\u53f0\u7ee7\u7eed\u8fd0\u884c\n4)\tfg  %\u4f5c\u4e1a\u7f16\u53f7\uff1a\u5c06\u540e\u53f0\u6682\u505c\u7684\u8fdb\u7a0b\u8c03\u56de\u524d\u53f0\u7ee7\u7eed\u8fd0\u884c\n5)\t\u7b26\u53f7&\uff1a\u5728\u547d\u4ee4\u884c\u7684\u7ed3\u5c3e\u5904\u9644\u52a0\u7b26\u53f7&\u8868\u793a\u5c06\u653e\u5230\u540e\u53f0\u8fd0\u884c\n6)\tbg\u548cfg\u6267\u884c\u6761\u4ef6\uff1a\u8fdb\u7a0b\u5df2\u7ecf\u5728\u540e\u53f0\u88ab\u6302\u8d77\n<\/pre>\n\n\n\n
                \u8bfe\u5802\u6f14\u793a\uff1a\u6253\u5f00\u4e24\u4e2a\u7ec8\u7aef<\/strong><\/p>\n\n\n\n
                \n\n\n\n
                1)\t\u5de6\u8fb9\u7a97\u53e3\u6267\u884c (while true; do echo -n \u201c rhcsa \u201d >> ~\/outfile;sleep 1; done) \n2)\t\u53f3\u8fb9\u7a97\u53e3\u6267\u884ctail -f ~\/outfile\n3)\t\u5de6\u8fb9\u7a97\u53e3\u6267\u884ccrtl+z\n4)\t\u5de6\u8fb9\u7a97\u53e3\u5148\u6267\u884cjobs\uff0c\u7136\u540e\u6267\u884c\u6267\u884cbg  %\u4f5c\u4e1a\u7f16\u53f7\n5)\t\u5de6\u8fb9\u7a97\u53e3\u4f7f\u7528\u7b2c1\u9898\u7684\u65b9\u6cd5\u6dfb\u52a0\u201crhce\u201d\u548c\u201crhca\u201d\u76f4\u63a5\u5230\u540e\u53f0\u8fd0\u884c \n     (while true; do echo -n \u201c rhce \u201d >> ~\/outfile;sleep 1; done) &\n     (while true; do echo -n \u201c rhca \u201d >> ~\/outfile;sleep 1; done) &\n6)\t\u5de6\u8fb9\u7a97\u53e3\u5c06\u540e\u53f0\u8fd0\u884c\u8c03\u5230\u524d\u53f0\uff0c\u7136\u540e\u7ec8\u6b62\uff08\u547d\u4ee4\u53c2\u8003\uff1afg  %\u4f5c\u4e1a\u7f16\u53f7\uff1b\u7136\u540e\u4f7f\u7528ctrl+c\u7ec8\u6b62\uff09\n<\/pre>\n\n\n\n
                \u4fe1\u53f7\u63a7\u5236\u8fdb\u7a0b<\/strong><\/p>\n\n\n\n
                \n\n\n\n
                • kill  -l  \u67e5\u770b\u4fe1\u53f7<\/li><\/ul>\n\n\n\n
                  \"\"<\/figure><\/div>\n\n\n\n
                  • \u4fe1\u53f7\u7f16\u53f7\u89c6\u4e0d\u540c\u7684Linxu\u786c\u4ef6\u5e73\u53f0\u800c\u4e0d\u540c\uff0c\u4f46\u4fe1\u53f7\u540d\u79f0\u548c\u542b\u4e49\u662f\u6807\u51c6\u5316\u7684\uff0c\u4f7f\u7528\u65f6\u5efa\u8bae\u4f7f\u7528\u4fe1\u53f7\u540d\u79f0<\/li><\/ul>\n\n\n\n
                    • kill\u547d\u4ee4\u4e3e\u4f8b<\/li><\/ul>\n\n\n\n
                      1)\tkill   -s  SIGKILL PID\n2)\tkill   -9  PID\n3)\tkill    \u4fe1\u53f7   %\u5e8f\u53f7\n<\/pre>\n\n\n\n
                      • killall\u547d\u4ee4\uff1a\u7528\u4e8e\u7ec8\u6b62\u67d0\u4e2a\u6307\u5b9a\u540d\u79f0\u7684\u670d\u52a1\u6240\u5bf9\u5e94\u7684\u5168\u90e8\u8fdb\u7a0b<\/li>
                      • pkill\uff1a\u5411\u4e00\u4e2a\u6216\u591a\u4e2a\u7b26\u5408\u9009\u62e9\u6761\u4ef6\u7684\u8fdb\u7a0b\u53d1\u9001\u4fe1\u53f7\u3002\u9009\u62e9\u6761\u4ef6\u53ef\u4ee5\u662f\u547d\u4ee4\u540d\u79f0\uff0c\u7279\u5b9a\u7528\u6237\u62e5\u6709\u7684\u8fdb\u7a0b\uff0c\u6216\u8005\u6240\u6709\u7cfb\u7edf\u8303\u56f4\u8fdb\u7a0b<\/li><\/ul>\n\n\n\n
                        1)\tUID---\u7531\u67d0\u4e00Linux\u7528\u6237\u8d26\u6237\u62e5\u6709\u7684\u8fdb\u7a0b\n2)\tGID---\u7531\u67d0\u4e00Linux\u7ec4\u8d26\u6237\u62e5\u6709\u7684\u8fdb\u7a0b\n3)\t\u7ec8\u7aef---\u8fd0\u884c\u4e8e\u7279\u5b9a\u63a7\u5236\u7ec8\u7aef\u7684\u8fdb\u7a0b\n<\/pre>\n\n\n\n
                        \u8bfe\u5802\u6f14\u793a\uff1a\u6253\u5f00\u4e24\u4e2a\u7ec8\u7aef<\/strong><\/p>\n\n\n\n
                        \n\n\n\n
                        1)\t\u5de6\u8fb9\u7a97\u53e3\u6267\u884c\u5982\u4e0b\u547d\u4ee4\n      (while true; do echo -n \u201c rhcsa\u201d >> ~\/outfile;sleep 1; done) &\n      (while true; do echo -n \u201c rhce\u201d >> ~\/outfile;sleep 1; done) &\n      (while true; do echo -n \u201c rhca\u201d >> ~\/outfile;sleep 1; done) &\n2)\t\u53f3\u8fb9\u7a97\u53e3tail -f ~\/outfile\u67e5\u770b\n3)\t\u5de6\u8fb9\u7a97\u53e3\u4f7f\u7528kill\u547d\u4ee4\u6682\u505c\u201crhcsa\u201d\u8f93\u5165\uff1b\u6574\u6d01\u7ec8\u6b62\u201crhce\u201d\u8f93\u5165\n\u547d\u4ee4\u53c2\u8003\uff1akill  -19  %\u4f5c\u4e1a\u7f16\u53f7\n4)\t\u5de6\u8fb9\u7a97\u53e3\u4f7f\u7528kill\u547d\u4ee4\u6062\u590d\u201crhcsa\u201d\u8f93\u5165\uff1b\u7ec8\u7ed3\u201crhcsa\u201d\u548c\u201crhca\u201d\u8f93\u5165\n\u547d\u4ee4\u53c2\u8003\uff1akill  -18  %\u4f5c\u4e1a\u7f16\u53f7\n5)\t\u5de6\u8fb9\u7a97\u53e3\u4f7f\u7528kill\u547d\u4ee4\u66b4\u529b\u7ec8\u7ed3\u201credhat\u201d\u548c\u201crhce\u201d\u8f93\u5165\n\u547d\u4ee4\u53c2\u8003\uff1akill  -9   %\u4f5c\u4e1a\u7f16\u53f7\n6)\t\u5de6\u8fb9\u7a97\u53e3\u4f7f\u7528pkill\u547d\u4ee4\u7ed3\u675ftail\u663e\u793a\n\u547d\u4ee4\u53c2\u8003\uff1apkill  tail \n<\/pre>\n\n\n\n
                        \u76d1\u63a7\u8fdb\u7a0b\u6d3b\u52a8<\/strong><\/p>\n\n\n\n
                        \n\n\n\n
                        • \u8d1f\u8f7d\u5e73\u5747\u503c\u6982\u5ff5\uff1aLinux\u5185\u6838\u63d0\u4f9b\u7684\u4e00\u79cd\u5ea6\u91cf\u65b9\u5f0f\uff1b\u8868\u793a\u4e00\u6bb5\u65f6\u95f4\u5185\u611f\u77e5\u7684\u7cfb\u7edf\u8d1f\u8f7d<\/li><\/ul>\n\n\n\n
                          \"\"<\/figure><\/div>\n\n\n\n
                          • \u6bcf5\u79d2\u949f\u6536\u96c6\u4e00\u6b21\u5f53\u524d\u8d1f\u8f7d\u6570\uff0c\u6c47\u603b\u8fd9\u4e9b\u6570\u503c\uff0c\u5f97\u5230\u6700\u8fd11\u5206\u949f\uff0c5\u5206\u949f\uff0c15\u5206\u949f\u5185\u7684\u6307\u6570\u79fb\u52a8\u5e73\u5747\u503c<\/li>
                          • top\u76d1\u63a7<\/li><\/ul>\n\n\n\n
                            \u8bfe\u5802\u6f14\u793a\uff1a\u6253\u5f00\u4e24\u4e2a\u7ec8\u7aef<\/strong><\/p>\n\n\n\n
                            \n\n\n\n
                            1)\t\u53f3\u8fb9\u7ec8\u7aef\u6267\u884ctop\u5b9e\u65f6\u76d1\u63a7\u7cfb\u7edf\u8fdb\u7a0b\n2)\t\u5de6\u8fb9\u7a97\u53e3\u6267\u884c\u547d\u4ee4\uff1add if=\/dev\/zero of=\/dev\/null &\n3)\t\u53f3\u8fb9\u7a97\u53e3\u67e5\u770bdd\u8fdb\u7a0b\n4)\t\u5de6\u8fb9\u7a97\u53e3\u518d\u6267\u884c1\u6b21dd\u547d\u4ee4\uff1b\u53f3\u8fb9\u7a97\u53e3\u89c2\u5bdf\n5)\t\u5de6\u8fb9\u7a97\u53e3\u518d\u6267\u884c5\u6b21dd\u547d\u4ee4\uff1b\u53f3\u8fb9\u7a97\u53e3\u89c2\u5bdf\n6)\t\u53f3\u8fb9\u7a97\u53e3top\u4e2d\u6740\u63891\u4e2add\u8fdb\u7a0b\uff0c\u5de6\u8fb9\u7a97\u53e3\u4f7f\u7528pkill\u6740\u6389\u5176\u4f59dd\u8fdb\u7a0b\n<\/pre>\n\n\n\n
                            \u8fdb\u7a0b\u4f18\u5148\u7ea7<\/strong><\/p>\n\n\n\n
                            \n\n\n\n
                            • nice\u7ea7\u522b\u53d6\u503c\u8303\u56f4\u4ecb\u4e8e-20~19\uff0c\u6570\u503c\u8d8a\u5c0f\u8d8a\u62a2\u5360CPU\u8d44\u6e90\uff0c\u9ed8\u8ba4nice\u7ea7\u522b\u4e3a0<\/li>
                            • root\u7528\u6237\u53ef\u4ee5\u964d\u4f4e\u8fdb\u7a0bnice\u7ea7\u522b\uff1b\u666e\u901a\u7528\u6237\u53ea\u80fd\u63d0\u9ad8\u81ea\u5df1\u7684nice\u7ea7\u522b<\/li>
                            • NI\u663e\u793a\u8fdb\u7a0b\u7684nice\u503c\uff1bPR\u663e\u793a\u5176\u8c03\u5ea6\u7684\u4f18\u5148\u7ea7<\/li><\/ul>\n\n\n\n
                              \"\"<\/figure><\/div>\n\n\n\n
                              • nice     -n  [-20\u202619]  command\uff1a\u542f\u52a8\u8fdb\u7a0b\u65f6\u8bbe\u7f6enice\u7ea7\u522b<\/li>
                              • renice  -n  [-20\u202619]  -p  PID\uff1a\u8c03\u6574\u5df2\u7ecf\u8fd0\u884c\u7684\u5e94\u7528\u7a0b\u5e8f\u6216\u547d\u4ee4\u7684nice\u7ea7\u522b<\/li><\/ul>\n\n\n\n
                                \u5b9e\u9a8c\u6f14\u793a\uff1a\u4e24\u4e2a\u7ec8\u7aef\u7a97\u53e3<\/strong><\/p>\n\n\n\n
                                \n\n\n\n
                                1)\t\u5de6\u8fb9\u7a97\u53e3\u6267\u884c2\u6b21\u547d\u4ee4\uff1add if=\/dev\/zero of=\/dev\/null & \n2)\t\u53f3\u8fb9\u7a97\u53e3\u6267\u884c\uff1atop\u67e5\u770b\n3)\t\u5de6\u8fb9\u7a97\u53e3\u6267\u884c\u547d\u4ee4\uff1a nice \u2013n 10  dd if=\/dev\/zero of=\/dev\/null & \n4)\t\u4f7f\u7528renice\u8c03\u6574\u521a\u521anice\u7ea7\u522b\u4e3a10\u7684\u8fdb\u7a0b\uff0c\u8c03\u6574\u4e3a-10\n\u3000\u3000\u3000\u3000  renice  -n  -10  -p  PID\uff08\u8fdb\u7a0bID\uff09<\/pre>\n","protected":false},"excerpt":{"rendered":"
                                \u7279\u6b8a\u6743\u9650\uff1a\u5f3a\u5236\u4f4d\uff08suid\uff09\uff0c\u5192\u9669\u4f4d\uff08sgid\uff09\uff0c\u9ecf\u8d34\u4f4d\uff08stick\uff09 \u8bbe\u7f6e\u7279\u6b8a\u6743\u9650 \u5f71\u54cd\u9ed8\u8ba4\u6587\u4ef6\u6743\u9650\u7684\u56e0\u7d20  […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[21],"tags":[],"_links":{"self":[{"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/7049"}],"collection":[{"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=7049"}],"version-history":[{"count":8,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/7049\/revisions"}],"predecessor-version":[{"id":7065,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/7049\/revisions\/7065"}],"wp:attachment":[{"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=7049"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=7049"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=7049"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}