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emulate htop with top

The top program from procps-ng (debian, centos/el7 later)

Ever being with htop for some time and miss the process tree and graphical CPU/memory usage?

The top program from procps-ng (debian, centos/el7 later) can easily emulate the presentation of htop view.

Start the top program, it looks like following with its default configuration: 

top - 09:20:54 up 307 days, 22:58,  4 users,  load average: 0.80, 0.74, 0.75
Tasks: 486 total,   1 running, 485 sleeping,   0 stopped,   0 zombie
%Cpu(s):  0.6 us,  0.6 sy,  0.0 ni, 98.8 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
KiB Mem : 65796532 total,   808264 free, 22970744 used, 42017524 buff/cache
KiB Swap: 16777212 total, 15433868 free,  1343344 used. 39944388 avail Mem

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
30561 clouder+  20   0   16.0g   2.3g  23296 S  11.6  3.6  11037:25 java
  703 yarn      20   0 2586468 429556  20704 S   1.0  0.7 258:14.48 java
   10 root      20   0       0      0      0 S   0.7  0.0   3613:19 rcu_sched
 2736 ericsson  20   0  162316   2684   1588 R   0.7  0.0   0:00.12 top
 2979 hdfs      20   0 6243524   1.9g  21560 S   0.7  3.0 576:11.19 java
 7197 root      20   0       0      0      0 S   0.7  0.0   0:34.26 kworker/8:2

Press ttmmcVz in the top screen, then the top view will be turn to like this: 

top - 09:25:20 up 307 days, 23:03,  4 users,  load average: 0.61, 0.60, 0.68
Tasks: 485 total,   2 running, 483 sleeping,   0 stopped,   0 zombie
%Cpu(s):   0.9/0.6     1[                                                                                               ] 
KiB Mem : 39.3/65796532 [                                                                                               ]
KiB Swap:  8.0/16777212 [                                                                                               ]

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
    1 root      20   0  199708   3652   1836 S   0.0  0.0  91:41.00 /usr/lib/systemd/systemd --system --deserialize 23
  699 root      20   0   53892  21140  20540 S   0.0  0.0  20:04.10  `- /usr/lib/systemd/systemd-journald
 1052 root      39  19   16808     20      0 S   0.0  0.0   0:10.43  `- /usr/sbin/alsactl -s -n 19 -c -E ALSA_CONFIG_PAT+  1056 libstor+  20   0    8524     32      0 S   0.0  0.0   1:57.23  `- /usr/bin/lsmd -d
 1058 root      20   0  419456   1288    704 S   0.0  0.0   7:34.04  `- /usr/sbin/ModemManager
 1063 root      20   0   25212   2328   1000 S   0.0  0.0  39:10.69  `- /usr/lib/systemd/systemd-logind

And if you really like the per CPU details, presss 1 in in the top screen.

Top Key Press Command explained

Press ? in the top screen, to get full list of supported KeyPress command.

t
toggles task/cpu stats, which cycles from 3 avaiable CPU stats presention styles.
m
toggles memory info, which also cycles from 3 avaiable Memory info presention styles.
c
toggles between Cmd name or Cmd line presention styles.
V
toggles between normal process list or Forest view (process tree with parent/children relationship).
z
toggles between color and mono display.
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