How to display only new results that did not exist in the previous grep run
I had one script which did a very basic job, grepping for the keyword ‘ERROR’ and printing the results to the console. It worked but i……
$ grep -rn "#Linux" ./posts
How to add swap space to Linux
One of the most common operations is to add swap space to a Linux machine, there are two ways, the first one is to create a swap partition……
Linux: How to expand an ext4 filesystem online
In the older times to expand a file system you would need to unmount the filesystem and apply some commands typically using the parted……
Awk: how to change timestamp format of a column
Recently i had a task to convert a csv file with timestamps in one column from a format to another! i didn't want to use Python for this……
Linux: How to delete files and directories older than a number of days
One very common task is to delete files and directories that are older than a number of days, this is what usually we do with backups and……
How to send email through sendgrid API using curl
Do you use sendgrid to send emails? if yes this article will help you to use curl to send emails through shell, lets see how!…
Linux: Execute commands in parallel with parallel-ssh
parallel-ssh is an asynchronous parallel SSH library designed for large scale automation.…
Linux: How to kill a process using its listening port or used files!
To kill a Linux process you need to know either its PID or the process name, but there is also another way not so well known but still very……
How to avoid multiple sudo commands in one-liners
We all love one-liners but soon one-liner like this will destroy the coolness of using oneliners…
Linux: text parsing tools and techniques
Knowing how to parse text files in Linux is essential in order to troubleshoot and analyze log files, in this example i will show you……