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ps command switches 

watch -n 1 'ps -e -o pid,uname,cmd,pmem,pcpu --sort=-pmem,-pcpu | head -15'
 
 Every 1.0s: ps -e -o pid,uname,cmd,pmem,pcpu --sort=-pmem,-pcpu | head -15                                                                      Mon Jan 12 17:57:24 2015

  PID USER     CMD                         %MEM %CPU
 1953 rahul    /usr/lib/firefox/firefox    18.7 18.4
 1751 rahul    cinnamon --replace           2.5  3.2
 1193 root     /usr/bin/X :0 -audit 0 -aut  1.8  3.0
 2170 rahul    totem /media/rahul/C384-4DE  1.2  0.1
 1769 rahul    nemo -n                      1.0  0.0
 1915 rahul    python /usr/lib/linuxmint/m  0.8  0.0
 4650 rahul    gedit /home/Apache bench ma  0.7  0.0
 1543 rahul    /usr/lib/cinnamon-settings-  0.5  0.0
 2256 rahul    gnome-terminal               0.5  0.0
 1909 rahul    cinnamon-screensaver         0.4  0.0
 1737 rahul    /usr/bin/python /usr/bin/ci  0.4  0.0
 1770 rahul    nm-applet                    0.4  0.0
 1768 rahul    /usr/lib/cinnamon-settings-  0.4  0.0
 1432 rahul    cinnamon-session --session   0.2  0.0

 
 
 Above can watch the full process with pid,uname...etc 
 
 
ps -ef : Full list of process or ps aux
 
ps -elf : Full length list
 
ps -p <pid> -o ppid=  : To get the parent process id of a process
 
ps -p <pid> -o etime= : To get the time the process running
 
ps -ylC httpd --sort:rss sort the resident set size of process specified by the switch C


rahul-Inspiron-3542 weighttp # ps -ylC apache2 --sort:rss
S   UID   PID  PPID  C PRI  NI   RSS    SZ WCHAN  TTY          TIME CMD
S     0 11086     1  0  80   0  2668 17821 poll_s ?        00:00:00 apache2
S    33 11089 11086  0  80   0  2924 106544 pipe_w ?       00:00:00 apache2
S    33 11090 11086  0  80   0  2928 106544 pipe_w ?       00:00:00 apache2


 
 
 
rahul-Inspiron-3542 weighttp # ps ef -o pid,ppid,pmem,rss,pcpu 
 PID  PPID %MEM   RSS %CPU
 2570  2263  0.0  2476  0.0
 2578  2570  0.0  3344  0.0
11847  2578  0.0   892  0.0
 1193  1183  1.8 73392  3.0
 1175     1  0.0   960  0.0
 1064     1  0.0   964  0.0
 1061     1  0.0   968  0.0
 1060     1  0.0   972  0.0
 1053     1  0.0   972  0.0
 1049     1  0.0   972  0.0

 
 
  
 

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