Read File Lines into Bash Arrays with mapfile
Use Bash mapfile to load file lines into an array without dropping the final line, plus version checks and memory limits.
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bashUsing Bash mapfile to Load Files into Arrays Efficiently
Learn how Bash’s mapfile builtin loads files into arrays faster and cleaner than traditional while-read loops, with a concrete example, trade‑offs, and verification steps.
Stop Reaching for while-read: Bash's readarray Is Often the Better Tool
Bash's readarray (mapfile) loads a whole file into an array in one shot — faster than while-read loops, free of subshell bugs, and ideal when the file fits in memory.
Speeding Up Line Processing in Bash with mapfile (readarray)
Bash’s mapfile builtin reads a file into an array in one go, cutting runtime and simplifying code compared to the classic while‑read loop. This guide shows how to use mapfile, benchmark the speedup, and when it’s appropriate.