file descriptor

The blog discusses the `exec {fd}file` command in bash scripting, used to automatically assign an unused file descriptor to a file for both reading and writing. It underscores the benefit of avoiding manual file descriptor numbering, thereby minimizing errors and boosting script robustness. The command requires pre-existing files and does not create new ones. Practical examples illustrate its utility in efficient file I/O operations within scripts.

The blog explores using `exec 3>&1` in Bash for redirecting subshell output to a parent's file descriptor, enhancing script flexibility and debug capabilities. It covers basics of file descriptors, provides examples, and discusses the advantages of capturing and displaying output simultaneously for debugging and logging.