subshells

In Linux Bash scripting, using subshells inside loops can decrease performance due to the high resource usage of spawning new subshells in each iteration. Process substitution, which uses `(commands)`, serves as an efficient alternative, allowing direct interaction with processes as if dealing with files. This method enhances script efficiency, especially when handling large datasets or in extensive loops, avoiding the overhead brought by subshells and improving execution speed.

This article delves into subshells in Linux Bash, exploring their creation and impact on the states of parent and child processes. It explains how subshells safely execute commands using inherited environments without affecting the parent shell, including alterations to variables, directory states, and exit statuses. Practical examples and additional resources are provided to enhance Bash scripting proficiency.