[CentOS 7系列]作業控制
阿新 • • 發佈：2017-06-30
作業
/* */ ~]# cat /etc/passwd | wc -l & ##管道符表示後面的命令作用於前面命令的結果
[2] 30138 ##“&”表示放在後臺運行
[[email protected] ~]# 21
jobs ## jobs命令用於查看後臺的任務
[1]+ 已停止 top
[2]- 完成 cat /etc/passwd | wc -l1、jobs
[[email protected] ~]# top
top - 06:39:07 up 8:24, 3 users, load average: 0.01, 0.04, 0.05
Tasks: 87 total, 1 running, 84 sleeping, 2 stopped, 0 zombie
%Cpu(s): 0.5 us, 0.4 sy, 0.0 ni, 99.0 id, 0.1 wa, 0.0 hi, 0.0 si, 0.0 st
KiB Mem : 1008392 total, 157936 free, 132356 used, 718100 buff/cache
KiB Swap: 2097148 total, 2097148 free, 0 used. 660208 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
30125 root 20 0 157572 2076 1504 R 6.2 0.2 0:00.01 top
1 root 20 0 45528 5812 3672 S 0.0 0.6 0:02.34 systemd
2 root 20 0 0 0 0 S 0.0 0.0 0:00.01 kthreadd
3 root 20 0 0 0 0 S 0.0 0.0 0:04.36 ksoftirqd/0
4 root 20 0 0 0 0 D 0.0 0.0 0:38.92 kworker/0:0
7 root rt 0 0 0 0 S 0.0 0.0 0:00.00 migration/0
8 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcu_bh
9 root 20 0 0 0 0 S 0.0 0.0 0:01.27 rcu_sched
10 root rt 0 0 0 0 S 0.0 0.0 0:02.68 watchdog/0
12 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 khelper
13 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kdevtmpfs
14 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 netns
15 root 20 0 0 0 0 S 0.0 0.0 0:00.01 khungtaskd
16 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 writeback
17 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kintegrityd
18 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 bioset
19 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kblockd
[1]+ 已停止 top ## ctrl+z 暫停一個任務
[[email protected]2、fg
[[email protected] ~]# jobs
[1]- 已停止 top
[2]+ 已停止 man fdisk
[[email protected] ~]# fg 1 ##將任務調度到前臺運行
top - 06:58:25 up 8:43, 3 users, load average: 0.00, 0.01, 0.05
Tasks: 102 total, 3 running, 82 sleeping, 17 stopped, 0 zombie
%Cpu(s): 0.0 us, 0.2 sy, 0.0 ni, 99.8 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
KiB Mem : 1008392 total, 153464 free, 136164 used, 718764 buff/cache
KiB Swap: 2097148 total, 2097148 free, 0 used. 656136 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
4 root 20 0 0 0 0 R 0.2 0.0 0:40.85 kworker/0:0
30083 root 20 0 143020 5556 4252 S 0.1 0.6 0:00.93 sshd
9 root 20 0 0 0 0 S 0.0 0.0 0:01.34 rcu_sched
287 root 20 0 0 0 0 S 0.0 0.0 0:08.18 xfsaild/sda3
502 root 20 0 327432 26912 6556 S 0.0 2.7 0:04.39 firewalld
30087 root 20 0 115508 2168 1764 R 0.0 0.2 0:00.21 bash
1 root 20 0 45528 5812 3672 S 0.0 0.6 0:02.35 systemd
10 root rt 0 0 0 0 S 0.0 0.0 0:02.71 watchdog/0
801 root 20 0 553152 18520 5816 S 0.0 1.8 0:07.17 tuned
20876 root 20 0 0 0 0 S 0.0 0.0 0:00.41 kworker/u12+
2 root 20 0 0 0 0 S 0.0 0.0 0:00.01 kthreadd
3 root 20 0 0 0 0 S 0.0 0.0 0:04.39 ksoftirqd/0
7 root rt 0 0 0 0 S 0.0 0.0 0:00.00 migration/0
8 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcu_bh
12 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 khelper
13 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kdevtmpfs
14 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 netns
## ctrl+c 結束一個任務
[[email protected]