command substitution

When stepping into the world of Linux, mastering the Bash shell can significantly augment your productivity and capability in handling tasks efficiently. Among the interesting features of Bash scripting, command substitution and pipelines stand out due to their power and versatility. This tutorial will clearly explain how these features work and how to use them effectively, while also guiding you on operating instructions for different package managers like apt, dnf, and zypper. Command substitution is a feature in Bash that allows the output of a shell command to replace the command itself. Command substitutions are executed in a subshell, and their output is then used in the context where they are called.

Command substitution is one of the vital features that you can leverage within shell scripting to make your scripts more dynamic and functional. It allows the output of a shell command to be captured and substituted in another command, or used as a value in a variable. This feature is incredibly useful in programming situations where the output from one command is dependent on the output of another. In the world of shell scripting, especially in Unix-like operating systems, command substitution is a mechanism by which the shell executes a command and replaces the command itself with the output. This output then can be used as input or arguments to another command.