pstree命令

pstree命令是用于查看进程树之间的关系，即哪个进程是父进程，哪个是子进程，可以清楚的看出来是谁创建了谁。

pstree未找到命令是因为没有安装psmisc

yum install psmisc

#pstree

base:~$ pstree -help
pstree: invalid option -- 'e'
Usage: pstree [-acglpsStuZ] [ -h | -H PID ] [ -n | -N type ]
              [ -A | -G | -U ] [ PID | USER ]
       pstree -V
Display a tree of processes.

  -a, --arguments     show command line arguments
  -A, --ascii         use ASCII line drawing characters
  -c, --compact       don't compact identical subtrees
  -h, --highlight-all highlight current process and its ancestors
  -H PID,
  --highlight-pid=PID highlight this process and its ancestors
  -g, --show-pgids    show process group ids; implies -c
  -G, --vt100         use VT100 line drawing characters
  -l, --long          don't truncate long lines
  -n, --numeric-sort  sort output by PID
  -N type,
  --ns-sort=type      sort by namespace type (cgroup, ipc, mnt, net, pid,
                                              user, uts)
  -p, --show-pids     show PIDs; implies -c
  -s, --show-parents  show parents of the selected process
  -S, --ns-changes    show namespace transitions
  -t, --thread-names  show full thread names
  -T, --hide-threads  hide threads, show only processes
  -u, --uid-changes   show uid transitions
  -U, --unicode       use UTF-8 (Unicode) line drawing characters
  -V, --version       display version information
  -Z, --security-context
                      show SELinux security contexts
  PID    start at this PID; default is 1 (init)
  USER   show only trees rooted at processes of this user

几个重要的参数：

-a :同时显示参数

-A: 各进程树之间的连接以ASCII码字符来连接

-U:各进程树之间的连接以utf8字符来连接，某些终端可能会有错误

-p:同时列出每个进程的PID

-u: 同时列出每个进程的所属账号名称：

base:~$ pstree
systemd─┬─ModemManager───2*[{ModemManager}]
        ├─NetworkManager─┬─dhclient
        │                └─2*[{NetworkManager}]
        ├─accounts-daemon───2*[{accounts-daemon}]
        ├─agetty
        ├─atd
        ├─chronyd
        ├─containerd─┬─containerd-shim─┬─mysqld───34*[{mysqld}]
        │            │                 └─10*[{containerd-shim}]
        │            ├─containerd-shim─┬─php-fpm───3*[php-fpm]
        │            │                 └─12*[{containerd-shim}]
        │            ├─containerd-shim─┬─nginx───8*[nginx]
        │            │                 └─10*[{containerd-shim}]
        │            ├─containerd-shim─┬─redis-server───3*[{redis-server}]
        │            │                 └─9*[{containerd-shim}]
        │            └─31*[{containerd}]
        ├─cron
        ├─dbus-daemon
        ├─dockerd─┬─2*[docker-proxy───21*[{docker-proxy}]]
        │         ├─2*[docker-proxy───5*[{docker-proxy}]]
        │         ├─docker-proxy───7*[{docker-proxy}]
        │         └─27*[{dockerd}]
        ├─irqbalance───{irqbalance}
        ├─lvmetad
        ├─lxcfs───4*[{lxcfs}]
        ├─networkd-dispat───{networkd-dispat}
        ├─polkitd───2*[{polkitd}]
        ├─rsync
        ├─rsyslogd───3*[{rsyslogd}]
        ├─sshd───sshd───sshd───bash───pstree
        ├─systemd───(sd-pam)
        ├─systemd-journal
        ├─systemd-logind
        ├─systemd-resolve
        ├─systemd-udevd
        ├─tinyproxy───100*[tinyproxy]
        ├─unattended-upgr───{unattended-upgr}
        ├─uuidd
        ├─wpa_supplicant
        ├─wrapper─┬─java───22*[{java}]
        │         └─{wrapper}
        └─zabbix_agentd───5*[zabbix_agentd]

完结