Statement True Even if Time is Different - bash

Question

I've been working on a bash script to change my background depending on the time of day but I can't figure out why the background is always changed to dawn even if the time is Noon.
#!/bin/bash
date=$(date "+%H")
DawnNum=$(seq -s " -o " 5 9)
DayNum=$(seq -s " -o " 10 17)
DuskNum=$(seq -s " -o " 18 22)
NightNum=$(seq -s " -o " 23 24)
NightNumCont=$(seq -s " -o " 0 4)
if
[ -e ~/.cache/weather.txt ] ;
then
rm ~/.cache/weather.txt ;
else
echo "Cache is clean." ;
fi
curl -o ~/.cache/weather.txt -s "https://weather.yahooapis.com/forecastrss?w=2470169&u=f" ;
cat ~/.cache/weather.txt | grep Rain -n | grep 29 || cat ~/.cache/weather.txt | grep Snow -n | grep 29 ;
current=$?
if
[ "$current" -eq 0 ] && [ "$date" -eq $DawnNum -o $DayNum ] ; then
gsettings set org.cinnamon.desktop.background picture-uri "file:///home/user/Pictures/Google Now/mountains-stormday.png" ;
elif
[ "$current" -eq 0 ] && [ "$date" -eq $DuskNum -o $NightNum ] ; then
gsettings set org.cinnamon.desktop.background picture-uri "file:///home/user/Pictures/Google Now/mountains-stormnight.png" ;
elif
[ "$current" -ne 0 ] && [ "$date" -eq $DawnNum ] ; then
gsettings set org.cinnamon.desktop.background picture-uri "file:///home/user/Pictures/Google Now/mountainsdawn.png" ;
elif
[ "$current" -ne 0 ] && [ "$date" -eq $DayNum ] ; then
gsettings set org.cinnamon.desktop.background picture-uri "file:///home/user/Pictures/Google Now/mountainsday.png" ;
elif
[ "$current" -ne 0 ] && [ "$date" -eq $DuskNum ] ; then
gsettings set org.cinnamon.desktop.background picture-uri "file:///home/user/Pictures/Google Now/mountainsdusk.png" ;
elif
[ "$current" -ne 0 ] && [ "$date" -eq $NightNum ] ; then
gsettings set org.cinnamon.desktop.background picture-uri "file:///home/user/Pictures/Google Now/mountainsnight.png" ;
else
gsettings set org.cinnamon.desktop.background picture-uri "file:///home/user/Pictures/Google Now/sanfranciscodawn.png" ;
fi
exit

Answer 1

I would recommend simplifying your logic and reducing repetition in your code. As you are using bash and working with integers, you can use (( )) numerical tests to determine what time range you are within. This kind of test doesn't require you to use $ variable names and expresses your meaning a little more clearly:
#!/bin/bash
date=$(date "+%H")
dawn_start=5
day_start=10
dusk_start=18
night_start=23
# ...
current=$?
if [[ "$current" == 0 ]]; then
if (( date >= dawn_start )) && (( date < dusk_start )); then
uri="mountains-stormday.png"
else
uri="mountains-stormnight.png"
fi
else
if (( date >= dawn_start )) && (( date < day_start )); then
uri="mountainsdawn.png"
elif (( date >= day_start )) && (( date < dusk_start )); then
uri="mountainsday.png"
elif (( date >= dusk_start )) && (( date < night_start )); then
uri="mountainsdusk.png"
elif (( date >= night_start )) || (( date < dawn_start )); then
uri="mountainsnight.png"
fi
fi
# catch-all, if $uri hasn't been set
[[ -z "$uri" ]] && uri="sanfranciscodawn.png"
dir="file:///home/user/Pictures/Google Now"
gsettings set org.cinnamon.desktop.background picture-uri "$dir/$uri"

Answer 2

This doesn't do what you expect:
[ "$date" -eq $DawnNum -o $DayNum ]
The problem is that -eq binds more tightly than -o.
A simpler test that might do what you are aiming for is:
[ "$date" -ge 5 ] && [ "$date" -le 17 ]