array=( $var )
If the variable should be a single element:
array=( "$var" )
If it's multiple lines, each of which should be an element:
# For bash mapfile -t array <<< "$var" # For ksh printf '%s\n' "$var" | while IFS="" read -r line; do array+=("$line"); done
If it's a line with multiple words (separated by spaces, other delimiters can be chosen with IFS), each of which should be an element:
# For bash IFS=" " read -r -a array <<< "$var" # For ksh IFS=" " read -r -A array <<< "$var"
You are expanding a variable unquoted in an array. This will invoke the shell's sloppy word splitting and glob expansion.
Instead, prefer explicitly splitting (or not splitting):
whileloops as appropriate.
This prevents the shell from doing unwanted splitting and glob expansion, and therefore avoiding problems with data containing spaces or special characters.
If you have already taken care (through setting IFS and
set -f) to have word splitting work the way you intend, you can ignore this warning.
ShellCheck is a static analysis tool for shell scripts. This page is part of its documentation.