bash命令

# last | egrep ‘(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])‘ | tr -s " " |cut -d" "  -f3 | uniq -c 呵呵呵呵呵呵

Xshell 5 (Build 0788)
Copyright (c) 2002-2015 NetSarang Computer, Inc. All rights reserved.

Type `help‘ to learn how to use Xshell prompt.
[d:\~]$ 

Connecting to 172.18.19.92:22...
Connection established.
To escape to local shell, press ‘Ctrl+Alt+]‘.

Last login: Mon Aug  8 08:37:22 2016 from 172.18.19.177
[root@localhost ~]# ^C
[root@localhost ~]# screen -ls
There is a screen on:
    43529.talk    (Attached)
1 Socket in /var/run/screen/S-root.

[root@localhost ~]# 

[root@localhost ~]# ifconfig | egrep ‘(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])‘
        inet 172.18.19.92  netmask 255.255.255.0  broadcast 172.18.19.255
        inet 127.0.0.1  netmask 255.0.0.0
        inet 192.168.122.1  netmask 255.255.255.0  broadcast 192.168.122.255

[root@localhost ~]# ifconfig
eno16777736: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 172.18.19.92  netmask 255.255.255.0  broadcast 172.18.19.255
        inet6 fe80::20c:29ff:fe3e:a13  prefixlen 64  scopeid 0x20<link>
        ether 00:0c:29:3e:0a:13  txqueuelen 1000  (Ethernet)
        RX packets 277761  bytes 323212801 (308.2 MiB)
        RX errors 0  dropped 3  overruns 0  frame 0
        TX packets 107462  bytes 11883689 (11.3 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0