linux shell中利用awk獲取關鍵字符的用法，實例說明。

1、busybox ifconfig wlan0

 

wlan0     Link encap:Ethernet  HWaddr 3C:CF:5B:84:15:90  

          inet addr:192.168.1.115  Bcast:192.168.1.255  Mask:255.255.255.0

          inet6 addr: fe80::3ecf:5bff:fe84:1590/64 Scope:Link

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:4224 errors:0 dropped:0 overruns:0 frame:0

          TX packets:1016 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000

          RX bytes:525489 (513.1 KiB)  TX bytes:67242 (65.6 KiB)

 

2、

awk 默認以空格作爲分隔符

以"addr:"爲分間隔。在“addr:”之前的數據爲"$1","addr:"之後的數據爲“$2”

 

命令：busybox ifconfig wlan0 | busybox awk -F'addr:' '{print $1}'

 

wlan0     Link encap:Ethernet  HWaddr 3C:CF:5B:84:15:90  

          inet

          inet6

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:4243 errors:0 dropped:0 overruns:0 frame:0

          TX packets:1016 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000

          RX bytes:527614 (515.2 KiB)  TX bytes:67242 (65.6 KiB)

 

命令:busybox ifconfig wlan0 | busybox awk -F'addr:' '{print $2}'

 

192.168.1.115  Bcast:192.168.1.255  Mask:255.255.255.0

 fe80::3ecf:5bff:fe84:1590/64 Scope:Link

 

3、將"addr:" "Bcast:"都作爲分隔符，看效果

 

命令：busybox ifconfig wlan0 | busybox awk -F'addr:|Bcast:' '{print $2}'

 

192.168.1.115  

 fe80::3ecf:5bff:fe84:1590/64 Scope:Link

 

命令:busybox ifconfig wlan0 | busybox awk -F'addr:|Bcast:' '{print $3}'

 

192.168.1.255  Mask:255.255.255.0

 

4、打印出關鍵字的所在行的信息，默認以空格爲分隔符

 

命令：busybox ifconfig wlan0 | busybox awk '/Mask/{print $1}'

 

inet

 

命令：busybox ifconfig wlan0 | busybox awk '/Bcast/{print $1}'

 

inet

 

命令：busybox ifconfig wlan0 | busybox awk '/Mask/{print $2}'

 

addr:192.168.1.115

 

命令：busybox ifconfig wlan0 | busybox awk '/Mask/{print $3}'

 

Bcast:192.168.1.255

 

命令：busybox ifconfig wlan0 | busybox awk -F'addr:' '/Mask/{print $2}'

 

192.168.1.115  Bcast:192.168.1.255  Mask:255.255.255.0

 

命令：busybox ifconfig wlan0 | busybox awk -F'addr:|Bcast' '/Mask/{print $2}'

 

192.168.1.115 （空格）  

 

5、可以通過tr命令刪除某些字符

 

命令：lsmod

 

dwc_otg 281370 0 - Live 0x0000000000000000

aml_thermal 18163 0 - Live 0x0000000000000000 (O)

mali 195296 10 - Live 0x0000000000000000 (O)

aml_nftl_dev 82380 0 - Live 0x0000000000000000 (PO)

 

命令：lsmod | busybox tr -d "aml"

 

dwc_otg 281370 0 - Live 0x0000000000000000

_ther 18163 0 - Live 0x0000000000000000 (O)

i 195296 10 - Live 0x0000000000000000 (O)

_nft_dev 82380 0 - Live 0x0000000000000000 (PO)

 

將'a','m','l'字符都給刪除了

 

6、busybox ifconfig wlan0 | busybox awk -F 'addr:|Bcast' '/Mask/{print $2}' | busybox tr -d " "

得到不含空格的IP地址：192.168.1.115