实用Linux命令记录

ss统计网络连接情况

[root@Dev-8.8.8.8 ~]# ss -tan |awk 'NR>1 {++sum[$1]} END{for(i in sum) print i"\t"sum[i]}'
ESTAB	33
TIME-WAIT	876
CLOSE-WAIT	4
LISTEN	9
[root@Dev-8.8.8.8 ~]#

split切割大文件

[root@Dev-8.8.8.8 logs]# split -l 100000 error.log -d -a 3 err_
[root@Dev-8.8.8.8 logs]#
[root@Dev-8.8.8.8 logs]# ll err_*
-rw-r--r-- 1 root root 13032896 Apr 26 10:00 err_000
-rw-r--r-- 1 root root 14881719 Apr 26 10:00 err_001
-rw-r--r-- 1 root root 34141600 Apr 26 10:00 err_002
-rw-r--r-- 1 root root 13040097 Apr 26 10:00 err_003
-rw-r--r-- 1 root root 13029133 Apr 26 10:00 err_004
-rw-r--r-- 1 root root 13029906 Apr 26 10:00 err_005
-rw-r--r-- 1 root root 21787781 Apr 26 10:00 err_006
-rw-r--r-- 1 root root 13024913 Apr 26 10:00 err_007
-rw-r--r-- 1 root root 14810882 Apr 26 10:00 err_008
-rw-r--r-- 1 root root 22828835 Apr 26 10:00 err_009
-rw-r--r-- 1 root root 10308780 Apr 26 10:00 err_010
[root@Dev-8.8.8.8 logs]#

# 补充：按指定文件大小分割
split -b 100m access.log -d -a 4 acc_

　　

文件去重

涉及 awk程序指令模型

补充 awk知识

# 参考：http://www.letuknowit.com/topics/20120401/use-awk-remove-duplicate-lines.html/

root@standby[16:34:30]$ cat 2.txt
hello world
awk
coding ants
hello world
awk
hello world
awk
coding ants
coding ants
root@standby[16:34:31]$ awk '!sum[$0]++' 2.txt
hello world
awk
coding ants
root@standby[16:34:38]$ awk '!sum[$0]++ {print $0}' 2.txt
hello world
awk
coding ants
root@standby[16:34:42]$ awk '!sum[$0]++ {print sum[$0]"\t"$0}' 2.txt
1	hello world
1	awk
1	coding ants
root@standby[16:34:55]$ awk '!sum[$0] {sum[$0]++; print sum[$0]"\t"$0}' 2.txt
1	hello world
1	awk
1	coding ants
root@Prism.Dev-10.49.134.67[16:35:04]$ 

文件去重并统计重复的行数，最后按行数排序

root@standby[16:57:35]$ cat 1.txt
hello world
awk
coding ants
hello world
awk
hello world
awk language is cool!
coding ants
coding Python
root@standby[16:57:36]$ sort 1.txt
awk
awk
awk language is cool!
coding ants
coding ants
coding Python
hello world
hello world
hello world
root@standby[16:57:44]$ sort 1.txt |uniq
awk
awk language is cool!
coding ants
coding Python
hello world
root@standby[16:57:46]$ 

# 显示重复次数
root@standby[16:57:46]$ sort 1.txt |uniq -c
      2 awk
      1 awk language is cool!
      2 coding ants
      1 coding Python
      3 hello world
root@standby[16:57:49]$ sort 1.txt |uniq -c |sort -k1 -n
      1 awk language is cool!
      1 coding Python
      2 awk
      2 coding ants
      3 hello world
root@standby[16:58:04]$ 

# 只显示重复的行
root@standby[16:58:10]$ sort 1.txt |uniq -d
awk
coding ants
hello world
root@standby[16:58:10]$ 

# 只显示唯一的行
root@standby[16:58:16]$ sort 1.txt |uniq -u
awk language is cool!
coding Python
root@standby[16:58:18]$

获取ip地址

root@standby[17:08:25]$ ifconfig eth0
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 10.130.8.100  netmask 255.255.224.0  broadcast 10.130.31.255
        ether fa:16:3e:c3:d5:2d  txqueuelen 1000  (Ethernet)
        RX packets 619942009  bytes 626016909706 (583.0 GiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 5486035  bytes 2419266407 (2.2 GiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

root@standby[17:08:28]$ ifconfig eth0 | grep "inet " | sed -e "s/^.*inet \(.*\)  netmask.*$/\1/"
10.130.8.100
root@standby[17:08:32]$

# 可用在Linux命令行提示符
export PS1="\[\033[01;31m\]\u\[\033[00m\]@\[\033[01;32m\]standby-`/sbin/ifconfig eth0 | grep "inet " | sed -e "s/^.*inet \(.*\)  netmask.*$/\1/"`\[\033[00m\][\[\033[01;33m\]\t\[\033[00m\]]$ "