Linux: How to append text to a file only if text does not exist
Assume the following scenario! you have multiple log lines coming from various sources but there is always the chance that there could be……
$ grep -rn "#Linux" ./posts
Linux: track a file and send an email when a particular text shows up
Assume that you have to solve the following problem, you have to constantly watch a log file for a specific event and then send an email……
How to record your terminal session and export it as animated GIF
In this article i will show you how you can record your terminal output and export it as an animated GIF, why to do that? there are……
How to grep patterns read from a file
grep is an awesome tool that allows you to search for strings, nunbers and patterns of them, its usage can be quite complicated since it……
How to append or prepend text in specific columns with awk
Assume the following scenario, you have a csv file with the following content and you need to do append / prepend text in specific columns……
How to make smaller executables with upx
UPX (Ultimate Packer for eXecutables) is a popular open-source executable packer that compresses and reduces the size of executable files……
Someone hide a jpg file without extension in your system! how you can find it?
Assume the following scenario! a hacker placed jpg files with company secrets in a server in order to retrieve them latter, jpg files have……
Linux: Find duplicate files easy!
One very common task (especially when you go out of disk space) is to find duplicate and compress them delete them etc.. in this article i……
Linux: How to create self deleting files!
In this article i will show you how you can create self deleting files!, files that will be deleted them self after a defined number of……
Validate email addresses with JQ
In this article i will show you a handy one-liner that can do the following, read from stdin a text file with email addresses, verify that……