The /proc/sys/net/ipv4/ip_local_port_range defines the local port range that is used by TCP and UDP traffic to choose the local port. You will see in the parameters of this file two numbers: The first number is the first local port allowed for TCP and UDP traffic on the server, the second is the last local port number. For high-usage systems you may change its default parameters to 32768-61000.

Even when you know the basics of searching in Mac’s Mail, sometimes an email message you clearly remember stubbornly stays lost.

If a Mail search doesn’t display messages that you know it should - and you’ve ruled out user error such as selecting the wrong mailbox, or choosing a header instead of message contents—there are several possible causes. Which solution to use depends on whether errors occur searching message contents (the body of your message) or headers (the contents of the To, CC, BCC, From, and Subject fields).

While SQL databases are insanely useful tools, their monopoly in the last decades is coming to an end. And it’s just time: I can’t even count the things that were forced into relational databases, but never really fitted them. (That being said, relational databases will always be the best for the stuff that has relations.)

But, the differences between NoSQL databases are much bigger than ever was between one SQL database and another. This means that it is a bigger responsibility on software architects to choose the appropriate one for a project right at the beginning.

To find duplicate words in a text by grep and support non-greedy search, you need to use -P which uses Perl regular expression to parse the pattern.

A very good post from The Unix School

In this article of the awk series, we will see the different scenarios in which we need to split a file into multiple files using awk. The files can be split into multiple files either based on a condition, or based on a pattern or because the file is big and hence needs to split into smaller files.

This is the summary of the discussion we had this Friday.

(I promise will enhance its appearance in future. :D)

There are many ways and many commands available to split a file in Linux - by size, by lines or by a certain pattern of the content. Here are some samples.

Usage of find command.

Usages of Linux rpm command.

In Git, there are two main ways to integrate changes from one branch into another: the merge and the rebase. Let’s see what rebasing is.