作者：长沙祛疤--欣奕除疤_998 | 来源：互联网 | 2017-10-25 12:17
文章标题：bash判断进程存在的3种方法。Linux是中国IT实验室的一个技术频道。包含桌面应用，Linux系统管理，内核研究，嵌入式系统和开源等一些基本分类
当前系统中的进程：
apple@ubuntu:~$ ps -ef
UID PID PPID C STIME TTY TIME CMD
root 1 0 0 13:57 ? 00:00:02 /sbin/init
root 2 0 0 13:57 ? 00:00:00 [kthreadd]
root 3 2 0 13:57 ? 00:00:00 [migration/0]
root 4 2 0 13:57 ? 00:00:00 [ksoftirqd/0]
root 5 2 0 13:57 ? 00:00:00 [watchdog/0]
root 6 2 0 13:57 ? 00:00:00 [migration/1]
root 7 2 0 13:57 ? 00:00:00 [ksoftirqd/1]
root 8 2 0 13:57 ? 00:00:00 [watchdog/1]
root 9 2 0 13:57 ? 00:00:00 [events/0]
root 10 2 0 13:57 ? 00:00:00 [events/1]
root 11 2 0 13:57 ? 00:00:00 [khelper]
root 12 2 0 13:57 ? 00:00:00 [kstop/0]
root 13 2 0 13:57 ? 00:00:00 [kstop/1]
root 14 2 0 13:57 ? 00:00:00 [kintegrityd/0]
root 15 2 0 13:57 ? 00:00:00 [kintegrityd/1]
root 16 2 0 13:57 ? 00:00:00 [kblockd/0]
root 17 2 0 13:57 ? 00:00:00 [kblockd/1]
root 18 2 0 13:57 ? 00:00:00 [kacpid]
root 19 2 0 13:57 ? 00:00:00 [kacpi_notify]
root 20 2 0 13:57 ? 00:00:00 [cqueue]
root 21 2 0 13:57 ? 00:00:00 [ata/0]
root 22 2 0 13:57 ? 00:00:00 [ata/1]
root 23 2 0 13:57 ? 00:00:00 [ata_aux]
root 24 2 0 13:57 ? 00:00:00 [ksuspend_usbd]
root 25 2 0 13:57 ? 00:00:00 [khubd]
root 26 2 0 13:57 ? 00:00:00 [kseriod]
root 27 2 0 13:57 ? 00:00:00 [kmmcd]
root 28 2 0 13:57 ? 00:00:00 [btaddconn]
root 29 2 0 13:57 ? 00:00:00 [btdelconn]
root 30 2 0 13:57 ? 00:00:00 [pdflush]
root 31 2 0 13:57 ? 00:00:00 [pdflush]
root 32 2 0 13:57 ? 00:00:00 [kswapd0]
root 33 2 0 13:57 ? 00:00:00 [aio/0]
root 34 2 0 13:57 ? 00:00:00 [aio/1]
root 35 2 0 13:57 ? 00:00:00 [ecryptfs-kthrea]
root 38 2 0 13:57 ? 00:00:00 [pciehpd]
root 39 2 0 13:57 ? 00:00:00 [scsi_eh_0]
root 40 2 0 13:57 ? 00:00:00 [scsi_eh_1]
root 41 2 0 13:57 ? 00:00:00 [kstriped]
root 42 2 0 13:57 ? 00:00:00 [kmpathd/0]
root 43 2 0 13:57 ? 00:00:00 [kmpathd/1]
root 44 2 0 13:57 ? 00:00:00 [kmpath_handlerd]
root 45 2 0 13:57 ? 00:00:00 [ksnapd]
root 46 2 0 13:57 ? 00:00:00 [kondemand/0]
root 47 2 0 13:57 ? 00:00:00 [kondemand/1]
root 48 2 0 13:57 ? 00:00:00 [krfcommd]
root 256 2 0 13:57 ? 00:00:00 [mpt_poll_0]
root 717 2 0 13:57 ? 00:00:00 [scsi_eh_2]
root 753 2 0 13:57 ? 00:00:00 [kdmflush]
root 764 2 0 13:57 ? 00:00:00 [kdmflush]
root 795 2 0 13:57 ? 00:00:00 [kjournald]
root 915 1 0 13:57 ? 00:00:00 /sbin/udevd --daemon
root 1617 2 0 13:57 ? 00:00:00 [kpsmoused]
root 2166 1 0 13:57 tty4 00:00:00 /sbin/getty 38400 tty4
root 2167 1 0 13:57 tty5 00:00:00 /sbin/getty 38400 tty5
root 2172 1 0 13:57 tty2 00:00:00 /sbin/getty 38400 tty2
root 2173 1 0 13:57 tty3 00:00:00 /sbin/getty 38400 tty3
root 2174 1 0 13:57 tty6 00:00:00 /sbin/getty 38400 tty6
root 2244 1 0 13:57 ? 00:00:00 /usr/sbin/acpid -c /etc/acpi/eve
root 2259 1 0 13:57 ? 00:00:00 /usr/sbin/syslog-ng -p /var/run/
105 2279 1 0 13:57 ? 00:00:00 /bin/dbus-daemon --system
root 2311 1 0 13:58 ? 00:00:00 /usr/sbin/incrond -f /etc/incron
root 2381 1 0 13:58 ? 00:00:00 dhclient3 -e IF_METRIC=100 -pf /
root 2442 1 0 13:58 ? 00:00:00 /usr/sbin/sshd
root 2453 1 0 13:58 ? 00:00:00 /usr/lib/postfix/master
postfix 2465 2453 0 13:58 ? 00:00:00 pickup -l -t fifo -u -c
postfix 2468 2453 0 13:58 ? 00:00:00 qmgr -l -t fifo -u
108 2472 1 0 13:58 ? 00:00:00 /usr/sbin/hald
root 2475 1 0 13:58 ? 00:00:00 /usr/sbin/console-kit-daemon
root 2538 2472 0 13:58 ? 00:00:00 hald-runner
root 2567 2538 0 13:58 ? 00:00:00 hald-addon-input: Listening on /
root 2594 2538 0 13:58 ? 00:00:00 hald-addon-storage: polling /dev
root 2595 2538 0 13:58 ? 00:00:00 hald-addon-storage: no polling o
108 2600 2538 0 13:58 ? 00:00:00 hald-addon-acpi: listening on ac
daemon 2647 1 0 13:58 ? 00:00:00 /usr/sbin/atd
root 2672 1 0 13:58 ? 00:00:00 /usr/sbin/cron
root 2691 1 0 13:58 tty1 00:00:00 /sbin/getty 38400 tty1
root 2994 2442 0 14:11 ? 00:00:00 sshd: apple [priv]
apple 3003 2994 0 14:11 ? 00:00:00 sshd: apple@pts/0
apple 3004 3003 1 14:11 pts/0 00:00:00 -bash
apple 3024 3004 0 14:11 pts/0 00:00:00 ps -ef
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