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In the realm of software development, testing is as crucial as the code itself. This is no different for shell scripts where reliable performance is mandatory, particularly in production environments or critical applications. For Bash and other shell script developers, ShellSpec has emerged as a reliable and powerful testing framework. In this blog, we will explore the features of ShellSpec, and provide a step-by-step guide on how to install it on various Linux distributions using different package managers. ShellSpec is a full-featured BDD (Behavior Driven Development) testing framework specifically for shell scripts. It works with most POSIX compliant shells including bash, ksh, zsh, and more.