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Come scoprire da quanto tempo un processo è in esecuzione, in Linux

di :: 06 marzo 2020 07:36
tempo esecuzione processo

tempo esecuzione processo

In questo breve articolo ti aiutiamo a scoprire da quanto tempo un processo attivo è in esecuzione sul tuo server Linux.

A  tale scopo utilizziamo il comando "ps", che viene utilizzato per visualizzare le informazioni sui processi attivi.

Ci siamo già occupati in un altro articolo del comando "ps": oggi ci focalizziamo sul tempo di esecuzione di un processo.

Innanzitutto identifichiamo il PID, cioè l'identificativo, di uno specifico processo, utilizzando il comando "pidof".

Ad esempio vogliamo sapere da quanto tempo il server web Apache è in esecuzione:

# pidof httpd
6040 6038 6035 6034 6033

Il risultato evidenzia che Apache ha vari processi attivi. Prendiamo ad esempio il primo 6040.

Bene, adesso grazie al comando "ps", associato ad alcune "parole chiave", otteniamo informazioni utili relative al tempo di esecuzione di quel processo.

Queste sono le parole chiave che andremo ad utilizzare

  • etime: indica il tempo trascorso dall'avvio del processo, nel formato minuti:secondi, e, se necessario, giorni e ore: [[DD-] hh:] mm: ss
  • etimes indica il tempo trascorso dall'avvio del processo, in secondi

Per conoscere il tempo di esecuzione del nostro processo, in giorni/ore/minuti/secondi, utilizziamo:

# ps -p 6040 -o etime
 ELAPSED
 04:05:37

La risposta "ELAPSED" è il tempo trascorso dall'avvio del processo.

Analogamente, per saper lo stesso tempo espresso in secondi, utilizziamo:

# ps -p 6040 -o etimes
ELAPSED
14749

Bene, adesso invece di soffermarci su un singolo processo, visualizziamo il tempo di attività, nel formato "etime", di tutti i processi:

# ps -eo pid,comm,lstart,etime,time,args

Il risultato sarà la lista di tutti i processi:

  PID COMMAND                          STARTED     ELAPSED     TIME COMMAND
    1 systemd         Thu Feb  6 06:08:17 2020 23-02:22:51 00:01:48 /usr/lib/systemd/systemd --switched-root --system --deserializ
    2 kthreadd        Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:00 [kthreadd]
    4 kworker/0:0H    Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:00 [kworker/0:0H]
    6 ksoftirqd/0     Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:10 [ksoftirqd/0]
    7 migration/0     Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:00 [migration/0]
    8 rcu_bh          Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:00 [rcu_bh]
    9 rcu_sched       Thu Feb  6 06:08:17 2020 23-02:22:51 00:14:15 [rcu_sched]
   10 lru-add-drain   Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:00 [lru-add-drain]
   11 watchdog/0      Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:05 [watchdog/0]
   12 watchdog/1      Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:05 [watchdog/1]
   13 migration/1     Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:00 [migration/1]
   14 ksoftirqd/1     Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:16 [ksoftirqd/1]
   16 kworker/1:0H    Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:00 [kworker/1:0H]
   17 watchdog/2      Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:05 [watchdog/2]
   18 migration/2     Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:00 [migration/2]
   19 ksoftirqd/2     Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:13 [ksoftirqd/2]
   21 kworker/2:0H    Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:00 [kworker/2:0H]
   22 watchdog/3      Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:05 [watchdog/3]
   23 migration/3     Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:00 [migration/3]
   24 ksoftirqd/3     Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:11 [ksoftirqd/3]
   26 kworker/3:0H    Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:00 [kworker/3:0H]
   27 watchdog/4      Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:04 [watchdog/4]
   28 migration/4     Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:00 [migration/4]
   29 ksoftirqd/4     Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:09 [ksoftirqd/4]
   31 kworker/4:0H    Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:00 [kworker/4:0H]
   32 watchdog/5      Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:04 [watchdog/5]
   33 migration/5     Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:00 [migration/5]
   34 ksoftirqd/5     Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:05 [ksoftirqd/5]
   36 kworker/5:0H    Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:00 [kworker/5:0H]
   37 watchdog/6      Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:04 [watchdog/6]
   38 migration/6     Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:00 [migration/6]
   39 ksoftirqd/6     Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:09 [ksoftirqd/6]
   41 kworker/6:0H    Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:00 [kworker/6:0H]
   42 watchdog/7      Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:04 [watchdog/7]
   43 migration/7     Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:01 [migration/7]
   44 ksoftirqd/7     Thu Feb  6 06:08:17 2020 23-02:22:51 00:01:17 [ksoftirqd/7]
   46 kworker/7:0H    Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:00 [kworker/7:0H]
   48 kdevtmpfs       Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:00 [kdevtmpfs]
   49 netns           Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:00 [netns]
   50 khungtaskd      Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:00 [khungtaskd]
   51 writeback       Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:00 [writeback]
   52 kintegrityd     Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:00 [kintegrityd]
   53 bioset          Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:00 [bioset]
   54 bioset          Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:00 [bioset]
   55 bioset          Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:00 [bioset]
   56 kblockd         Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:00 [kblockd]
   57 md              Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:00 [md]
   58 edac-poller     Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:00 [edac-poller]
   59 watchdogd       Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:00 [watchdogd]
   68 kswapd0         Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:00 [kswapd0]
   69 ksmd            Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:00 [ksmd]
   70 khugepaged      Thu Feb  6 06:08:17 2020 23-02:22:51 00:04:06 [khugepaged]
   71 crypto          Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:00 [crypto]
   79 kthrotld        Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:00 [kthrotld]
   81 kmpath_rdacd    Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:00 [kmpath_rdacd]
   82 kaluad          Thu Feb  6 06:08:17 2020 23-02:22:51 00:00:00 [kaluad]
   84 kpsmoused       Thu Feb  6 06:08:18 2020 23-02:22:50 00:00:00 [kpsmoused]
   86 ipv6_addrconf   Thu Feb  6 06:08:18 2020 23-02:22:50 00:00:00 [ipv6_addrconf]
   99 deferwq         Thu Feb  6 06:08:18 2020 23-02:22:50 00:00:00 [deferwq]
  137 kauditd         Thu Feb  6 06:08:18 2020 23-02:22:50 00:00:10 [kauditd]
  346 scsi_eh_0       Thu Feb  6 06:08:18 2020 23-02:22:50 00:00:00 [scsi_eh_0]
  348 scsi_tmf_0      Thu Feb  6 06:08:18 2020 23-02:22:50 00:00:00 [scsi_tmf_0]
  355 ata_sff         Thu Feb  6 06:08:18 2020 23-02:22:50 00:00:00 [ata_sff]
  616 scsi_eh_1       Thu Feb  6 06:08:18 2020 23-02:22:50 00:00:00 [scsi_eh_1]
  619 scsi_tmf_1      Thu Feb  6 06:08:18 2020 23-02:22:50 00:00:00 [scsi_tmf_1]
  624 scsi_eh_2       Thu Feb  6 06:08:18 2020 23-02:22:50 00:00:00 [scsi_eh_2]
  630 scsi_tmf_2      Thu Feb  6 06:08:18 2020 23-02:22:50 00:00:00 [scsi_tmf_2]
  633 scsi_eh_3       Thu Feb  6 06:08:18 2020 23-02:22:50 00:00:00 [scsi_eh_3]
  635 scsi_tmf_3      Thu Feb  6 06:08:18 2020 23-02:22:50 00:00:00 [scsi_tmf_3]
  638 scsi_eh_4       Thu Feb  6 06:08:18 2020 23-02:22:50 00:00:00 [scsi_eh_4]
  643 scsi_tmf_4      Thu Feb  6 06:08:18 2020 23-02:22:50 00:00:00 [scsi_tmf_4]
  646 scsi_eh_5       Thu Feb  6 06:08:18 2020 23-02:22:50 00:00:00 [scsi_eh_5]
  647 scsi_tmf_5      Thu Feb  6 06:08:18 2020 23-02:22:50 00:00:00 [scsi_tmf_5]
  648 scsi_eh_6       Thu Feb  6 06:08:18 2020 23-02:22:50 00:00:00 [scsi_eh_6]
  656 scsi_tmf_6      Thu Feb  6 06:08:18 2020 23-02:22:50 00:00:00 [scsi_tmf_6]
  859 ttm_swap        Thu Feb  6 06:08:18 2020 23-02:22:50 00:00:00 [ttm_swap]
  881 poll_megasas0_s Thu Feb  6 06:08:19 2020 23-02:22:49 00:00:00 [poll_megasas0_s]
  946 kdmflush        Thu Feb  6 06:08:19 2020 23-02:22:49 00:00:00 [kdmflush]
  947 bioset          Thu Feb  6 06:08:19 2020 23-02:22:49 00:00:00 [bioset]
  957 kdmflush        Thu Feb  6 06:08:19 2020 23-02:22:49 00:00:00 [kdmflush]
  958 bioset          Thu Feb  6 06:08:19 2020 23-02:22:49 00:00:00 [bioset]
  974 jbd2/dm-0-8     Thu Feb  6 06:08:19 2020 23-02:22:49 00:05:28 [jbd2/dm-0-8]
  975 ext4-rsv-conver Thu Feb  6 06:08:19 2020 23-02:22:49 00:00:00 [ext4-rsv-conver]
 1062 systemd-journal Thu Feb  6 06:08:19 2020 23-02:22:49 00:01:10 /usr/lib/systemd/systemd-journald
 1087 lvmetad         Thu Feb  6 06:08:19 2020 23-02:22:49 00:00:00 /usr/sbin/lvmetad -f
 1093 systemd-udevd   Thu Feb  6 06:08:19 2020 23-02:22:49 00:00:00 /usr/lib/systemd/systemd-udevd
 1159 kworker/u16:1   Sat Feb 29 06:07:25 2020    02:23:43 00:00:00 [kworker/u16:1]
 1428 kvm-irqfd-clean Thu Feb  6 06:08:20 2020 23-02:22:48 00:00:00 [kvm-irqfd-clean]
 1748 jbd2/sda1-8     Thu Feb  6 06:08:20 2020 23-02:22:48 00:00:00 [jbd2/sda1-8]
 1755 ext4-rsv-conver Thu Feb  6 06:08:20 2020 23-02:22:48 00:00:00 [ext4-rsv-conver]
 1917 kworker/2:1H    Thu Feb  6 06:08:24 2020 23-02:22:44 00:00:00 [kworker/2:1H]
 1918 kworker/4:1H    Thu Feb  6 06:08:31 2020 23-02:22:37 00:00:00 [kworker/4:1H]
 1919 kworker/5:1H    Thu Feb  6 06:08:55 2020 23-02:22:13 00:00:00 [kworker/5:1H]
 1943 auditd          Thu Feb  6 06:09:18 2020 23-02:21:50 00:00:19 /sbin/auditd
 1967 rngd            Thu Feb  6 06:09:18 2020 23-02:21:50 00:03:10 /sbin/rngd -f
 1974 smartd          Thu Feb  6 06:09:18 2020 23-02:21:50 00:00:00 /usr/sbin/smartd -n -q never
 1977 lsmd            Thu Feb  6 06:09:18 2020 23-02:21:50 00:00:04 /usr/bin/lsmd -d
 1978 irqbalance      Thu Feb  6 06:09:18 2020 23-02:21:50 00:03:10 /usr/sbin/irqbalance --foreground
 1995 abrtd           Thu Feb  6 06:09:18 2020 23-02:21:50 00:00:00 /usr/sbin/abrtd -d -s
 1997 dsm_sa_eventmgr Thu Feb  6 06:09:18 2020 23-02:21:50 00:00:17 /opt/dell/srvadmin/sbin/dsm_sa_eventmgrd
 1998 abrt-watch-log  Thu Feb  6 06:09:18 2020 23-02:21:50 00:00:00 /usr/bin/abrt-watch-log -F BUG: WARNING: at WARNING: CPU: INFO
 2002 polkitd         Thu Feb  6 06:09:18 2020 23-02:21:50 00:00:08 /usr/lib/polkit-1/polkitd --no-debug
 2006 dbus-daemon     Thu Feb  6 06:09:18 2020 23-02:21:50 00:01:37 /usr/bin/dbus-daemon --system --address=systemd: --nofork --no
 2023 dsm_om_connsvcd Thu Feb  6 06:09:18 2020 23-02:21:50 00:00:00 /opt/dell/srvadmin/sbin/dsm_om_connsvcd -run
 2028 dsm_om_connsvcd Thu Feb  6 06:09:18 2020 23-02:21:50 00:37:37 /opt/dell/srvadmin/sbin/dsm_om_connsvcd -run
 2032 chronyd         Thu Feb  6 06:09:18 2020 23-02:21:50 00:00:02 /usr/sbin/chronyd
 2048 NetworkManager  Thu Feb  6 06:09:18 2020 23-02:21:50 00:00:26 /usr/sbin/NetworkManager --no-daemon
 2049 systemd-logind  Thu Feb  6 06:09:18 2020 23-02:21:50 00:00:38 /usr/lib/systemd/systemd-logind
 2056 crond           Thu Feb  6 06:09:18 2020 23-02:21:50 00:00:03 /usr/sbin/crond -n
 2057 atd             Thu Feb  6 06:09:18 2020 23-02:21:50 00:00:00 /usr/sbin/atd -f
 2089 kworker/5:1     Sun Feb 23 11:30:00 2020  5-21:01:08 00:00:03 [kworker/5:1]
 2199 dsm_sa_datamgrd Thu Feb  6 06:09:19 2020 23-02:21:49 00:13:35 /opt/dell/srvadmin/sbin/dsm_sa_datamgrd
 2439 httpd           Thu Feb  6 06:09:25 2020 23-02:21:43 00:09:45 /usr/sbin/httpd -DFOREGROUND
 2443 sshd            Thu Feb  6 06:09:25 2020 23-02:21:43 00:00:13 /usr/sbin/sshd -D
 2445 vsftpd          Thu Feb  6 06:09:25 2020 23-02:21:43 00:00:01 /usr/sbin/vsftpd /etc/vsftpd/vsftpd.conf
 2448 tuned           Thu Feb  6 06:09:25 2020 23-02:21:43 00:02:32 /usr/bin/python2 -Es /usr/sbin/tuned -l -P
 2452 rsyslogd        Thu Feb  6 06:09:25 2020 23-02:21:43 00:01:34 /usr/sbin/rsyslogd -n
 2458 opendkim        Thu Feb  6 06:09:25 2020 23-02:21:43 00:00:13 /usr/sbin/opendkim -x /etc/opendkim.conf -P /var/run/opendkim/
 2460 fail2ban-server Thu Feb  6 06:09:25 2020 23-02:21:43 00:33:30 /usr/bin/python2 /usr/bin/fail2ban-server -xf start
 2463 xinetd          Thu Feb  6 06:09:25 2020 23-02:21:43 00:00:00 /usr/sbin/xinetd -stayalive -pidfile /var/run/xinetd.pid
 2567 VVAgent         Thu Feb  6 06:09:25 2020 23-02:21:43 00:00:14 /opt/BUAgent/VVAgent -d -p /opt/BUAgent
 2610 mysqld          Thu Feb  6 06:09:25 2020 23-02:21:43 12:06:47 /usr/sbin/mysqld
 2658 agetty          Thu Feb  6 06:09:25 2020 23-02:21:43 00:00:00 /sbin/agetty --noclear tty1 linux
 2915 master          Thu Feb  6 06:09:25 2020 23-02:21:43 00:00:08 /usr/libexec/postfix/master -w
 2920 qmgr            Thu Feb  6 06:09:25 2020 23-02:21:43 00:00:01 qmgr -l -t unix -u
 3132 buagent         Thu Feb  6 06:09:26 2020 23-02:21:42 00:11:38 /opt/BUAgent/buagent --path "/opt/BUAgent"
 3153 kworker/7:1H    Thu Feb  6 06:09:30 2020 23-02:21:38 00:00:00 [kworker/7:1H]
 3159 kworker/1:1H    Thu Feb  6 06:09:45 2020 23-02:21:23 00:00:00 [kworker/1:1H]
 3689 kworker/u16:2   Sat Feb 29 07:15:01 2020    01:16:07 00:00:00 [kworker/u16:2]
 3823 kworker/3:1H    Thu Feb  6 06:09:51 2020 23-02:21:17 00:00:00 [kworker/3:1H]
 3864 dsm_sa_snmpd    Thu Feb  6 06:09:56 2020 23-02:21:12 00:11:47 /opt/dell/srvadmin/sbin/dsm_sa_snmpd
 3880 kworker/6:1H    Thu Feb  6 06:10:06 2020 23-02:21:02 00:00:00 [kworker/6:1H]
 3882 dsm_sa_datamgrd Thu Feb  6 06:10:07 2020 23-02:21:01 00:00:00 /opt/dell/srvadmin/sbin/dsm_sa_datamgrd
 3896 kworker/0:1H    Thu Feb  6 06:11:11 2020 23-02:19:57 00:00:00 [kworker/0:1H]
 4088 pickup          Sat Feb 29 07:28:12 2020    01:02:56 00:00:00 pickup -l -t unix -u
 5187 kworker/0:0     Sat Feb 29 08:00:00 2020       31:08 00:00:00 [kworker/0:0]
 5846 kworker/7:2     Thu Feb 13 15:06:16 2020 15-17:24:52 00:00:11 [kworker/7:2]
 5949 httpd           Sat Feb 29 08:20:22 2020       10:46 00:00:02 /usr/sbin/httpd -DFOREGROUND
 5954 httpd           Sat Feb 29 08:20:23 2020       10:45 00:00:02 /usr/sbin/httpd -DFOREGROUND
 5973 sshd            Sat Feb 29 08:21:04 2020       10:04 00:00:00 sshd: root@pts/0
 5985 bash            Sat Feb 29 08:21:12 2020       09:56 00:00:00 -bash
 6033 httpd           Sat Feb 29 08:21:18 2020       09:50 00:00:02 /usr/sbin/httpd -DFOREGROUND
 6035 httpd           Sat Feb 29 08:21:19 2020       09:49 00:00:03 /usr/sbin/httpd -DFOREGROUND
 6059 httpd           Sat Feb 29 08:21:52 2020       09:16 00:00:02 /usr/sbin/httpd -DFOREGROUND
 6126 httpd           Sat Feb 29 08:25:03 2020       06:05 00:00:01 /usr/sbin/httpd -DFOREGROUND
 6176 httpd           Sat Feb 29 08:26:10 2020       04:58 00:00:03 /usr/sbin/httpd -DFOREGROUND
 6181 httpd           Sat Feb 29 08:26:11 2020       04:57 00:00:00 /usr/sbin/httpd -DFOREGROUND
 6332 httpd           Sat Feb 29 08:30:54 2020       00:14 00:00:00 /usr/sbin/httpd -DFOREGROUND
 6333 httpd           Sat Feb 29 08:30:55 2020       00:13 00:00:00 /usr/sbin/httpd -DFOREGROUND
 6334 httpd           Sat Feb 29 08:30:55 2020       00:13 00:00:00 /usr/sbin/httpd -DFOREGROUND
 6342 httpd           Sat Feb 29 08:30:57 2020       00:11 00:00:00 /usr/sbin/httpd -DFOREGROUND
 6343 httpd           Sat Feb 29 08:30:57 2020       00:11 00:00:00 /usr/sbin/httpd -DFOREGROUND
 6344 httpd           Sat Feb 29 08:30:57 2020       00:11 00:00:00 /usr/sbin/httpd -DFOREGROUND
 6345 httpd           Sat Feb 29 08:30:57 2020       00:11 00:00:00 /usr/sbin/httpd -DFOREGROUND
 6353 ps              Sat Feb 29 08:31:08 2020       00:00 00:00:00 ps -eo pid,comm,lstart,etime,time,args
 8097 tlsmgr          Thu Feb  6 08:09:25 2020 23-00:21:43 00:00:01 tlsmgr -l -t unix -u
10794 kworker/5:0     Fri Feb 28 20:23:46 2020    12:07:22 00:00:00 [kworker/5:0]
11849 kworker/4:2     Fri Feb 28 20:40:00 2020    11:51:08 00:00:00 [kworker/4:2]
13237 kworker/6:1     Thu Feb 27 20:10:07 2020  1-12:21:01 00:00:01 [kworker/6:1]
16855 kworker/1:1     Fri Feb 28 22:30:00 2020    10:01:08 00:00:00 [kworker/1:1]
18177 kworker/4:1     Sat Feb  8 14:59:57 2020 20-17:31:11 00:00:14 [kworker/4:1]
18568 kworker/2:1     Fri Feb 28 23:10:00 2020    09:21:08 00:00:00 [kworker/2:1]
20507 uptimed         Wed Feb 26 15:07:43 2020  2-17:23:25 00:00:01 /usr/sbin/uptimed -f
22379 kworker/7:0     Sat Feb 29 00:30:00 2020    08:01:08 00:00:00 [kworker/7:0]
25292 kworker/6:2     Sat Feb 29 02:00:00 2020    06:31:08 00:00:00 [kworker/6:2]
25437 kworker/3:1     Fri Feb 28 15:03:58 2020    17:27:10 00:00:03 [kworker/3:1]
25671 kworker/0:2     Wed Feb 19 13:00:01 2020  9-19:31:07 00:00:15 [kworker/0:2]
25717 kworker/1:0     Sat Feb 22 18:50:00 2020  6-13:41:08 00:00:10 [kworker/1:0]
28698 kworker/3:0     Fri Feb 28 16:15:58 2020    16:15:10 00:00:00 [kworker/3:0]
31733 kworker/2:2     Mon Feb 24 20:30:00 2020  4-12:01:08 00:00:06 [kworker/2:2]

Vediamo il significato di ogni colonna

PID: è l'id del processo
COMMAND: è il comando che ha lanciato il processo, senza opzioni o argomenti
STARTED: è la data di avvio del processo.
ELAPSED: è il tempo di esecuizone del processo, nel nostro caso nel formato "etime"
TIME: tempo cumulativo di utilizzo della cpu, espresso nel formato "etime".
COMMAND: è il comando che ha lanciato il processo, comprensivo di opzioni e argomenti

Per maggiori dettagli relativi al comando ps, si rimanda alla sua manual page:

# man ps

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