fontcharlist.sh

#!/bin/bash -

# Source: https://unix.stackexchange.com/a/595816
# To get a list of characters in a font:
# ./fontcharlist.sh /fontdir/font

Usage() {
    echo "$0 FontFile"
    exit 1
}
SayError() {
    local error=$1
    shift
    echo "$0: $@"
    exit "$error"
}

[ "$#" -ne 1 ] && Usage

width=70
fontfile="$1"

[ -f "$fontfile" ] || SayError 4 'File not found'

list=$(fc-query --format='%{charset}\n' "$fontfile")

for range in $list; do
    IFS=- read start end <<< "$range"
    if [ "$end" ]; then
        start=$((16#$start))
        end=$((16#$end))
        for ((i = start; i <= end; i++)); do
            printf -v char '\\U%x' "$i"
            printf '%b' "$char"
        done
    else
        printf '%b' "\\U$start"
    fi
done | grep -oP '.{'"$width"'}'