Why does the command ps not display the entire list of processes?












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If the command ps awx is run the following output is produced. The list below is the last 20 lines of the complete output.



 4247 pts/1    Ss+    0:00 /bin/bash
4442 ? S< 0:00 [kworker/u17:1]
4661 ? S< 0:00 [kworker/u17:3]
4731 ? S< 0:00 [kworker/u17:5]
4734 ? S 0:00 pickup -l -t fifo -u
4847 ? S< 0:00 [kworker/u17:7]
4850 ? S 0:00 [kworker/u16:3]
4878 ? S 0:00 [kworker/u16:0]
5201 ? S< 0:00 [kworker/u17:8]
5353 ? S 0:00 [kworker/0:1]
5354 ? S 0:00 [kworker/7:2]
5355 ? S 0:00 [kworker/u16:2]
5361 ? S 0:00 [kworker/4:0]
5362 tty1 Ss 0:00 -bash
5396 ? S 0:00 [kworker/6:0]
5418 ? S 0:00 [kworker/0:0]
5420 ? S 0:00 [kworker/2:2]
5431 ? S 0:00 [kworker/7:0]
5562 ? S 0:00 [kworker/4:2]
5620 tty1 R+ 0:00 ps awx


If a subsequent command ps awx | grep grep is run the following output is generated.



5646 tty1     S+     0:00 grep --color=auto grep


Additionally if the following command ps awx | grep agetty is run, the following output is displayed.



5669 tty1     S+     0:00 grep --color=auto agetty


Why does the command ps awx not display the process identification numbers 5646 and 5669? In fact there are no other processes listed after 5620.









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    0















    If the command ps awx is run the following output is produced. The list below is the last 20 lines of the complete output.



     4247 pts/1    Ss+    0:00 /bin/bash
    4442 ? S< 0:00 [kworker/u17:1]
    4661 ? S< 0:00 [kworker/u17:3]
    4731 ? S< 0:00 [kworker/u17:5]
    4734 ? S 0:00 pickup -l -t fifo -u
    4847 ? S< 0:00 [kworker/u17:7]
    4850 ? S 0:00 [kworker/u16:3]
    4878 ? S 0:00 [kworker/u16:0]
    5201 ? S< 0:00 [kworker/u17:8]
    5353 ? S 0:00 [kworker/0:1]
    5354 ? S 0:00 [kworker/7:2]
    5355 ? S 0:00 [kworker/u16:2]
    5361 ? S 0:00 [kworker/4:0]
    5362 tty1 Ss 0:00 -bash
    5396 ? S 0:00 [kworker/6:0]
    5418 ? S 0:00 [kworker/0:0]
    5420 ? S 0:00 [kworker/2:2]
    5431 ? S 0:00 [kworker/7:0]
    5562 ? S 0:00 [kworker/4:2]
    5620 tty1 R+ 0:00 ps awx


    If a subsequent command ps awx | grep grep is run the following output is generated.



    5646 tty1     S+     0:00 grep --color=auto grep


    Additionally if the following command ps awx | grep agetty is run, the following output is displayed.



    5669 tty1     S+     0:00 grep --color=auto agetty


    Why does the command ps awx not display the process identification numbers 5646 and 5669? In fact there are no other processes listed after 5620.









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      If the command ps awx is run the following output is produced. The list below is the last 20 lines of the complete output.



       4247 pts/1    Ss+    0:00 /bin/bash
      4442 ? S< 0:00 [kworker/u17:1]
      4661 ? S< 0:00 [kworker/u17:3]
      4731 ? S< 0:00 [kworker/u17:5]
      4734 ? S 0:00 pickup -l -t fifo -u
      4847 ? S< 0:00 [kworker/u17:7]
      4850 ? S 0:00 [kworker/u16:3]
      4878 ? S 0:00 [kworker/u16:0]
      5201 ? S< 0:00 [kworker/u17:8]
      5353 ? S 0:00 [kworker/0:1]
      5354 ? S 0:00 [kworker/7:2]
      5355 ? S 0:00 [kworker/u16:2]
      5361 ? S 0:00 [kworker/4:0]
      5362 tty1 Ss 0:00 -bash
      5396 ? S 0:00 [kworker/6:0]
      5418 ? S 0:00 [kworker/0:0]
      5420 ? S 0:00 [kworker/2:2]
      5431 ? S 0:00 [kworker/7:0]
      5562 ? S 0:00 [kworker/4:2]
      5620 tty1 R+ 0:00 ps awx


      If a subsequent command ps awx | grep grep is run the following output is generated.



      5646 tty1     S+     0:00 grep --color=auto grep


      Additionally if the following command ps awx | grep agetty is run, the following output is displayed.



      5669 tty1     S+     0:00 grep --color=auto agetty


      Why does the command ps awx not display the process identification numbers 5646 and 5669? In fact there are no other processes listed after 5620.









      share














      If the command ps awx is run the following output is produced. The list below is the last 20 lines of the complete output.



       4247 pts/1    Ss+    0:00 /bin/bash
      4442 ? S< 0:00 [kworker/u17:1]
      4661 ? S< 0:00 [kworker/u17:3]
      4731 ? S< 0:00 [kworker/u17:5]
      4734 ? S 0:00 pickup -l -t fifo -u
      4847 ? S< 0:00 [kworker/u17:7]
      4850 ? S 0:00 [kworker/u16:3]
      4878 ? S 0:00 [kworker/u16:0]
      5201 ? S< 0:00 [kworker/u17:8]
      5353 ? S 0:00 [kworker/0:1]
      5354 ? S 0:00 [kworker/7:2]
      5355 ? S 0:00 [kworker/u16:2]
      5361 ? S 0:00 [kworker/4:0]
      5362 tty1 Ss 0:00 -bash
      5396 ? S 0:00 [kworker/6:0]
      5418 ? S 0:00 [kworker/0:0]
      5420 ? S 0:00 [kworker/2:2]
      5431 ? S 0:00 [kworker/7:0]
      5562 ? S 0:00 [kworker/4:2]
      5620 tty1 R+ 0:00 ps awx


      If a subsequent command ps awx | grep grep is run the following output is generated.



      5646 tty1     S+     0:00 grep --color=auto grep


      Additionally if the following command ps awx | grep agetty is run, the following output is displayed.



      5669 tty1     S+     0:00 grep --color=auto agetty


      Why does the command ps awx not display the process identification numbers 5646 and 5669? In fact there are no other processes listed after 5620.







      bash ps





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