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Linux 高频面试题和标准答案(进程 & 端口 & 监控)

  • 2026-04-19 17:51:32
Linux 高频面试题和标准答案(进程 & 端口 & 监控)
7、查看进程常用命令？
  • ps -ef/ ps aux：静态查进程
  • top / htop：动态实时监控
  • kill -9 PID：强制杀进程（慎用）
  • kill -15 PID：优雅关闭（推荐）
8、查看端口占用？
netstat -tulnpss -tulnp   # 更快，推荐lsof -i:端口号
9、僵尸进程、孤儿进程？
  • 僵尸：子进程死了，父没收尸，残留 PID 占资源
  • 孤儿：父进程挂了，子被 init (1 号进程) 收养，无害
10、后台运行程序？
  • &：后台运行
  • nohup 命令 &：断 ssh 不退出，日志输出 nohup.out
  • screen / tmux：会话常驻
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  1. 请求信息 : 2026-04-19 18:19:56 HTTP/2.0 GET : https://f.mffb.com.cn/a/485167.html
  2. 运行时间 : 0.198239s [ 吞吐率：5.04req/s ] 内存消耗：4,783.70kb 文件加载：140
  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=b3a4002a236a87ed1fd68575a31ee7ae
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  1. CONNECT:[ UseTime:0.001160s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001762s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.016246s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000277s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000632s ]
  6. SELECT * FROM `set` [ RunTime:0.000217s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000639s ]
  8. SELECT * FROM `article` WHERE `id` = 485167 LIMIT 1 [ RunTime:0.000546s ]
  9. UPDATE `article` SET `lasttime` = 1776593996 WHERE `id` = 485167 [ RunTime:0.001872s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.001771s ]
  11. SELECT * FROM `article` WHERE `id` < 485167 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000796s ]
  12. SELECT * FROM `article` WHERE `id` > 485167 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000521s ]
  13. SELECT * FROM `article` WHERE `id` < 485167 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002725s ]
  14. SELECT * FROM `article` WHERE `id` < 485167 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000912s ]
  15. SELECT * FROM `article` WHERE `id` < 485167 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000947s ]
0.199863s