script robustness

Welcome to today's deep dive into an effective but less commonly known bash scripting technique. Today, we're exploring the use of the exec {fd}<>file construct, which opens up powerful possibilities for file handling in bash scripts. Q1: What does exec {fd}<>file do in a Bash script? A1: The exec {fd}<>file command is used to open a file for both reading and writing. {fd} automatically assigns a file descriptor to the file named file. This means that the file is attached to a newly allocated file descriptor (other than 0, 1, or 2, which are reserved for stdin, stdout, and stderr, respectively).