[root@centos7 log]# ps -f -e -o pid,ppid,pgid,comm

PID PPID PGID COMMAND

5070 5068 5070 bash

7169 5070 7169 \_ bash

7173 7169 7169 \_ bash

7179 7173 7169 | \_ bzip2

7174 7169 7169 \_ bash

7180 7174 7169 | \_ bzip2

7175 7169 7169 \_ bash

7181 7175 7169 | \_ bzip2

7176 7169 7169 \_ bash

7182 7176 7169 | \_ bzip2

7177 7169 7169 \_ bash

7178 7177 7169 \_ bzip2

2290 2288 2290 bash

7183 2290 7183 \_ ps

1675 1638 1675 bash

817 1 817 agetty