Some application scenarios for the shell

Source: Internet
Author: User

List the number of connections per IP
awk ' /^tcp/{print} ' awk ' !/^::/{print $ {} ' Sort Uniq Sort awk ' begin{printf "%-10s%s\n", "Connum", "IP"}{printf "%-10s%s\n", $1,$2} '

Command explanation:

    • Netstat-n refused to display aliases, can show the number of all converted into numbers;
    • awk '/^tcp/{print $ ' prints the 5th column of the line starting with TCP;
    • Awk-f: '!/^::/{print $ ' with a colon as the delimiter, and "::" is removed, and the first column is printed;
    • Uniq-c the number of times each line appears in the input file before the output line;
    • Sort-rn in reverse order, sorted by numerical value;
    • awk ' begin{printf '%-10s%s\n "," Connum "," IP "}{printf"%-10s%s\n ", $1,$2} ' start adding a row Connum IP,"-"left aligned," 10s "string occupies 10 columns

List the top 10 most visited IPs in a log
Cat awk ' {print $} ' Sort | Uniq Sort Head Ten

Command explanation:

    • Uniq-c the number of times each line appears in the input file before the output line;
    • Sort-rn in reverse order, sorted by numerical value;
    • Head-n 10 first 10 rows;

Some application scenarios for the shell

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