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• Creating an array from a text file in Bash
• What is the difference between thee approaches to reading a file that has just one line?

• Creating an array from a text file in Bash
• What is the difference between thee approaches to reading a file that has just one line?
• Bash while read loop extremely slow compared to cat, why?

• Creating an array from a text file in Bash

• Creating an array from a text file in Bash
• What is the difference between thee approaches to reading a file that has just one line?

Based on @chepner's answer here:

-u is a bash extension. For POSIX compatibility, each call would look something like read -r X <&3.