查看磁盘空间：df-hFilesystemSizeUsedAvailUse%Mountedon/dev/xvda140G4.5G33G12%/tmpfs498M0498M0%/dev/shm-h以人们容易理解的方式GBMBKB如`df-h/etc`会自动分析目录所在分区的磁盘容量，查看目录大小：du-sh[root@niewjserver]#du-s*|sort-nr371644bk304964jdk1.7.0_80173240node125732tomcat7.0.7339904ghost10292svn2160flask0.104hello.py4apps-ssummary摘要空间大小-h易读格式GBMBKB排序indescendingorderofoccupiedspaceis-nrs——按数字排列；-r逆序du-hs*-->*表示目录下所有文件的单独汇总，不是整体汇总，单独汇总。top动态查看进程（相对ps）和进程占用的CPU、MEM等，按q离开。-d后接更新时间，单位秒，默认5秒。在更新状态的过程中：按PMN会按照CPU、MEM内存占用、进程号倒序显示。[root@niewjserver]#top-d20top-17:56:26up124days,2:49,1user,loadaverage:0.35,0.15,0.08Tasks:75total,1running,74sleeping,0stopped,0zombieCpu(s):0.2%us,0.1%sy,0.0%ni,99.6%id,0.0%wa,0.0%hi,0.0%si,0.1%stMem:1018508ktotal,900120kused,118388kfree,187012kbuffersSwap:0k总计，0k使用，0k免费，327424k缓存PIDUSERPRNIVIRTRESSHRS%CPU%MEMTIME+COMMAND1root20019232828536S0.00.10:03.18init2root200000S0.00.00:00.24kthreadd3根RT0000S0.00.00:00.00迁移/04根200000S0.00.00:18.67ksoftirqd/05根RT0000S0.00.00:00.00停止器/06根RT0000S0.00.00:11.98看门狗/07根200000S0.00.09:00.49事件/08根200000S0.00.00:00.00事件/09根200000S0.00.00:00.00events_long/010根200000S0.00.00:00.00events_power_ef11根200000S0.00.00:00.00cgroup12root200000S0.00.00:00.00khelper13root200000S0.00.00:00.00netns14root200000S0.00.00:00.00async/mgr15root200000S0.00.00:00.00pm例如，按下P后：PIDUSERPRNIVIRTRESSHRS%CPU%MEMTIME+COMMAND7313root200286m89483248S0.30.9392:16.48AliHids1root20019232828536S0.00.10:03.18init2root2000000S0.00.00:00.24kthreadd3rootRT0:00S迁移/04root200000S0.00.00:18.67ksoftirqd/05rootRT0000S0.00.00:00.00stopper/06rootRT0000S0.00.00:11.98看门狗/07根200000S0.00.09:00.51事件/08根200000S0.00.00:00.00事件/09根200000S0.00.00:00.00events_long/010root200000S0.00.00:00.00events_power_ef11root200000S0.00.00:00.00cgroup12root200000S0.00.00:00.00khelper13root200000S0.00.00:00.00netns14root200000S0.00.00:00.00async/mgr比如按下M其中后：PIDUSERPRNIVIRTRESSHRS%CPU%MEMTIME+COMMAND6579root2001011m128m5732S0.012.983:01.51node/var/www/g9016root200704m64m4852S0.06.537:30.25PM2v2.2.1:God5428mysql2006928m73m65：29.57MySQLD7313根200286M89483248S1.20.9392：16.64Alihids881root2006732455762332S0.00.5367：367：31.36Aliyundun10511Root10511root200243m4864864864864864864864868S0.50.777.777.77l.00.50.77.77l.00.00.00.00.77lys0.500.00.00.00.00.77lys0.500.00.00.00.00.00.00.00.00.00.00.00.00.00.500.00.50.00.00.00.77lt45003432S0.00.40:00.27sshd3032root200105m19961448S0.00.20:00.16bash836root2002452019041420S0.00.268:20.81AliYunDunUpdate10589ntp200266001504980S0.00.10:38.68ntpd10540nscd200615m1420932S0.00.10:21.77nscd10421root200114m1264656S0.00.10:14.35crond10364root200662361232516S0.00.10：10.46SSHD3719根2001501611961196944R0.00：00.03TOP310根200152M888476S0.10：00.48SVRET20019232828536S0.00：03.18820432S0.00.10:00.08udevd例如，按下N后：PIDUSERPRNIVIRTRESSHRS%CPU%MEMTIME+COMMAND10589ntp200266001504980S0.00.10:38.68ntpd10540nscd200615m1420932S0.00.10:21.77nscd10511root200243m4864868S0.00.50:11.77rsyslogd10421root200114m1264656S0.00.10：14.35CROND10364根200662361232516S0.00.10：10.46SSHD9724根16-410648820432S0.00.10：00.08.2.1:神7313根200286m89483248S0.30.9392:16.83AliHids6579根2001011m128m5732S0.012.983:01.55节点/var/www/g5428MySQL200694M35M2876S0.03.635：29.60MySQLD5311root2005m676436S0.00：00.00mysqld_safe4266root18-2106446400.00.00：00.00ududududevd372372372372lots0.0.0.00.0.0.0.0.0.0.0.0.0.0.0.0cor03719根200150161196944r0.00：00.04顶3032根2005M19961448S0.00：00.16bash3030root200100m45003432S0.03432S0.00.40：00.270:00.00mingettyfree查看内存空间使用情况：-gGBunit-mMB-kKB：系统共有994M内存；swaphas0Mfreememory115M,在已经使用的879M内存中，182M和319M分别用于buffer和cache[root@niewjserver]#free-mtotalusedfreesharedbufferscachedMem:9948791150182319-/+buffers/cache:376617Swap:000[root@niewjserver]#http://blog.csdn.net/guolong1...uptime显示系统启动运行了多长时间，以及1、5、15分钟的平均负载：[root@niewjserver]#uptime18:30:02up124days,3:23,1user,平均负载：0.14、0.08、0.09[2017-03-27]
