gistfile1.txt

# exec form
FROM ubuntu
ENTRYPOINT ["top", "-b"]

# exec form result
top - 03:41:47 up 19 min,  0 users,  load average: 0.61, 0.34, 0.27
Tasks:   1 total,   1 running,   0 sleeping,   0 stopped,   0 zombie
%Cpu(s):  3.0 us,  2.3 sy,  0.0 ni, 94.4 id,  0.4 wa,  0.0 hi,  0.0 si,  0.0 st
KiB Mem :  3938828 total,  1300384 free,   582236 used,  2056208 buff/cache
KiB Swap:  1023996 total,  1023996 free,        0 used.  2561664 avail Mem

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
    1 root      20   0   36484   3024   2672 R   0.0  0.1   0:00.07 top


# shell form
FROM ubuntu
ENTRYPOINT top -b

# shell form result
top - 03:43:40 up 21 min,  0 users,  load average: 0.17, 0.25, 0.24
Tasks:   2 total,   1 running,   1 sleeping,   0 stopped,   0 zombie
%Cpu(s):  2.8 us,  2.6 sy,  0.0 ni, 94.2 id,  0.4 wa,  0.0 hi,  0.0 si,  0.0 st
KiB Mem :  3938828 total,  1312452 free,   569556 used,  2056820 buff/cache
KiB Swap:  1023996 total,  1023996 free,        0 used.  2574344 avail Mem

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
    1 root      20   0    4628    808    744 S   0.0  0.0   0:00.01 sh
    5 root      20   0   36484   3052   2704 R   0.0  0.1   0:00.02 top