How not to read lines.

evilReadLines.sh

#!/usr/bin/env bash
# bash / ksh93 / mksh / zsh
# Don't do this!

${ZSH_VERSION+false} || emulate ksh
unset -v isKsh93
[[ ${!KSH_VERSION} == .sh.version ]] && isKsh93=

# Reads lines from file or stdin into arrayName, stupidly.
# evilReadLines arrayName [ file ]
function evilReadLines {
	# Ensure $1 is nonempty, and $2 is either a readable file, or if $2 is
	# unset, stdin isn't a terminal.
	[[ -n $1 && ( -r $2 || ( -z ${2+_} && ! -t 0 ) ) ]] || return

	# Make $1 a reference parameter, and the a local var of the same name a
	# reference to $1, in ksh93 only.
	${isKsh93+eval typeset -n "${1}=\$1"}

	# Preserve the previous glob and brace expansion states.
	# set options are only local in ksh93.
	typeset -a onReturn
	if [[ ! -o noglob ]]; then
		set -f
		onReturn+=('set +f')
	fi

	if [[ -o braceexpand ]]; then
		set +o braceexpand
		onReturn+=('set -o braceexpand')
	fi

	# Do the stupid word split.
	IFS=$'\n' command eval "$1"'=($(<"${2:-/dev/fd/0}"))'

	# Reset previous option states.
	typeset cmd
	for cmd in "${onReturn[@]}"; do
		eval "$cmd"
	done
}

function main {
	# set -x; ${isKsh93+typeset -ft evilReadLines}
	typeset -a myArray

	# Pass in an array name and file name
	evilReadLines myArray
	typeset -p myArray
}

main <<\EOF
foo
bar
baz
EOF

# vim: set fenc=utf-8 ff=unix ft=sh :