Unix操作系统实验，包括UNIX 操作系统的使用及SHELL 编程以及进程的创建和管理（使用fork()函数）
-Unix operating system, including the use of the UNIX operating system and programming SHELL process and the creation and management (using the fork () function)
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.003136s ]
SELECT `a`.`aid`,`a`.`title`,`a`.`create_time`,`m`.`username` FROM `jrk_downrecords` `a` INNER JOIN `jrk_member` `m` ON `a`.`uid`=`m`.`id` WHERE `a`.`status` = 1 GROUP BY `a`.`aid` ORDER BY `a`.`create_time` DESC LIMIT 10 [ RunTime:0.117570s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001034s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001141s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001088s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003088s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000891s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.004061s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.019528s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001083s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 313818 [ RunTime:0.023953s ]
