Why my application can’t open more than 1024 or 4096 sockets in Linux

Linux sets a default limit on number of FDs that can be opened by a process. These limits can be changed with Super user permissions.
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Seemless directory navigation in bash

It is time (and brain) consuming to remember and type the directory path if you require to move across directories frequently. You can save some time and energy with three in-built commands supported by bash. They are pushd, popd and dirs. Read more on this in “Seemless directory navigation in bash” at TechPulp.com
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Linux file compression tools/utilities

Linux has various types of compression and decompression tools like tar, gzip, bzip2, zip and compress. Read the full article explaining how to use them with examples here.
http://www.techpulp.com/articles/linux/art-linux-compression-utilities.php

Identify processes that have open sockets

The lsof can be used to find the list of processes that have active sockets open.
Then netstat command can be used to verify it.
Find more details here.
http://www.techpulp.com/articles/linux/tip-identify-process-with-open-socket.php