mapfile
reads lines into a bash array
TLDR
Read file into array
$ mapfile [array] < [file.txt]
Read with line limit$ mapfile -n [10] [array] < [file.txt]
Skip first N lines$ mapfile -s [2] [array] < [file.txt]
Remove trailing newlines$ mapfile -t [array] < [file.txt]
Use specific delimiter$ mapfile -d ':' [array] < [file.txt]
Read from command$ mapfile [array] < <(ls)
SYNOPSIS
mapfile [options] [array]
DESCRIPTION
mapfile reads lines into a bash array. It's a bash builtin for array population.
The tool is also known as readarray. It efficiently reads files line by line into arrays.
PARAMETERS
ARRAY
Array variable name.-n COUNT
Maximum lines to read.-s COUNT
Lines to skip.-t
Remove trailing delimiters.-d DELIM
Use delimiter instead of newline.
CAVEATS
Bash-specific builtin. Not available in sh. Alias is readarray.
HISTORY
mapfile was added to Bash 4.0 as a builtin for efficiently reading files into arrays.