Bash script to return the last 8 posts from a subreddit

reddit-rss-feeder.sh

#!/bin/sh
#
# usage: ./reddit-rss-feeder.sh subreddit-name hot/new/rising/controversial/top/gilded
#   default subreddit-name = popular
#   default tab = hot
# e.g.: ./reddit-rss-feeder.sh bikewrench new
#
# This script uses rsstail to retrieve latests entries from Reddit Bikecommuting rss feed
# and process them through awk. Each update shows a timestamp separator.
#
# Slightly modified from jvalencia80 (https://gist.github.com/jvalencia80/101f57cf9294e9410f69b95a9a78e6ae) by Ironjanowar (https://gist.github.com/Ironjanowar/527f274017b406f486060a2e89bf97e8) and minor additions by normcyr
#
# It will work with most RSS feeds out there.
#
# rsstail options used here (according to rsstail code, https://github.com/flok99/rsstail):
# -r: print in reverse order (newest first)
# -l: show link
# -H: string HTML
# -u: input URL
# -i: interval check in seconds
# -n: number of posts to return

if [ $# -eq 1 ]; then
    subreddit="r/$1"
    tab="hot"
elif [ $# -eq 2 ]; then
    subreddit="r/$1"
    tab="$2"
else
    subreddit="r/popular"
fi

echo "Getting /$subreddit/$tab"

rsstail -rlH -u https://www.reddit.com/$subreddit/$tab/.rss -i 300 -n 8 | awk '
        BEGIN {
                ResetColor  = "\033[0m"
                BrightColor = "\033[1;33m"
                DarkColor   = "\033[1;30m"
                last_update = systime()
        }
        /^Title:/ {
                title = $0
                sub(/Title:/, "", title)
        }
        /^Link:/ {
                link = $0
                sub(/Link:/, "", link)
        }
        title && link {
                # timestamp spam protection (30 seconds)
                if (systime() - last_update >= 30) {
                        print DarkColor "---[ " strftime("%H:%M") " ]-------------" ResetColor
                        print ""
                        last_update = systime()
                }

                print BrightColor title ResetColor
                print DarkColor link ResetColor
                print ""
                title = link = ""
        }
'

Need to deal with error if subreddit does not exist.