The pngquant is a tool that allows to compress PNG images via command line. On Raspberry Pi, use the APT package manager to install pngquant unless you want to install...

While working with filesystem, we may need to check if a file or directory exists. Programming languages provides various methods to do that. A table includes links to posts with...

While working with filesystem, we may need to append text to a file. Programming languages provides various methods to do that. A table includes links to posts with examples. No.Programming...

ExifTool is a command line tool for reading, writing and updating metadata of media files like images, video, audio, and PDF. It is a cross-platform tool that requires the Perl...

JSON is a text-based data format that commonly used to store or transmit data objects between systems. While working with data validators we may need to check if a string...

While working with data filtering, sometimes we may need to check if a string contains a substring. Programming languages provides various methods to do that. A table includes a links...

The inxi is a command line tool that allows to retrieve details about hardware components on a system such as CPU, RAM, disks, network interfaces, USB controllers, graphics, audio, etc...

The gdu is a command line tool that allows to view and analyze disk space usage. The gdu is similar to the ncdu command, but gdu is faster to scan...

While working with data filtering, sometimes we may need to check if a string ends with substring. Programming languages provides various methods to do that. A table includes a links...

While working with data filtering, sometimes we may need to check if a string starts with substring. Programming languages provides various methods to do that. A table includes a links...