"Linux" text extraction

Extract IP address :

Method ①:

" : " " " -f1

ifconfig: The command that displays or configures the network device is followed by the device name.

The Ifconfig eth3 is displayed as follows:

grep: followed by a regular expression that displays the rows that appear in the regular expression

The Ifconfig eth3|grep bcast is displayed as:

cut:-D followed by the number after the delimiter-F indicates the first data to get the split

Ifconfig eth3|grep bcast|cut-d ":" After-f2 shown as:

Ifconfig eth3|grep bcast|cut-d ":"-f2|cut-d ""-f1 then acquired the IP address

Awk Small Example

From http://www.cnblogs.com/xupeizhi/archive/2012/07/23/2605371.html

① output file contains rows that conform to a regular expression

awk '/111*/' text output text file contains rows that conform to the 111* field

② the nth field of each row in the output file

awk ' {print '} ' text output text file in the first field of each line

awk ' {print $1,$3} ' text output text is separated from the first and third fields in each line

"Linux" text extraction