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https://unix.stackexchange.com/q/434701
Title:
How can I change what's displayed at a login shell?
ID:
/2018/03/31/How-can-I-change-what_s-displayed-at-a-login-shell_
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March 31, 2018
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From Ask Ubuntu:
Check the Ask Ubuntu link above for comments and possibly new answers from other users.
now bash script
The heavy lifting is the splash component that shows this:
$ now
Weather report: Edmonton March 2018 ββββββββββββββββββββββββββββββ
Su Mo Tu We Th Fr Sa β ββββΊβ ββββββ βββββ³β β
\ / Sunny 1 2 3 β βββ β βΉββββββ« β£βββββ β
.-. -23--14 Β°C 4 5 6 7 8 9 10 β ββββΊβ»βΈβΉβββΈβββ βΉ βΉ βΉ β
β ( ) β β 22 km/h 11 12 13 14 15 16 17 ββββββββββββββββββββββββββββββ
`-β 14 km 18 19 20 21 22 23 24
/ \ 0.9 mm 25 26 27 28 29 30 31
Yes it really is -14 in Edmonton and feels like -23. A good time to spend the long-weekend inside playing the newly arrived Tomb Raider 2013! Maybe brush up on that Resume to move to Vancouver or Montrealβ¦
Here is the code:
#!/bin/bash
# NAME: now
# PATH: $HOME/bin
# DESC: Display current weather, calendar and time
# CALL: Called from terminal or ~/.bashrc
# DATE: Apr 6, 2017. Modified: Mar 30, 2018.
# NOTE: To display all available toilet fonts use this one-liner:
# for i in ${TOILET_FONT_PATH:=/usr/share/figlet}/*.{t,f}lf; do j=${i##*/}; toilet -d "${i%/*}" -f "$j" "${j%.*}"; done
# Setup for 92 character wide terminal
DateColumn=34 # Default is 27 for 80 character line, 34 for 92 character line
TimeColumn=61 # Default is 49 for " " " " 61 " " " "
#--------- WEATHER ----------------------------------------------------------
# Current weather, already in color so no need to override
echo " "
# Replace Edmonton with your city name, GPS, etc. See: curl wttr.in/:help
curl wttr.in/Edmonton?0 --silent --max-time 3
# Timeout #. Increase for slow connection---^
echo " "
echo " " # Pad with blank lines for calendar & time to fit
#--------- DATE -------------------------------------------------------------
# calendar current month with today highlighted.
# colors 00=bright white, 31=red, 32=green, 33=yellow, 34=blue, 35=purple,
# 36=cyan, 37=white
tput sc # Save cursor position.
# Move up 9 lines
while [ $((++i)) -lt 10 ]; do tput cuu1; done
# Depending on length of your city name and country name you will:
# 1. Comment out next three lines of code. Uncomment fourth code line.
# 2. Change subtraction value and set number of print spaces to match
# subtraction value. Then place comment on fourth code line.
Column=$(($DateColumn - 10))
tput cuf $Column # Move x column number
printf " " # Blank out ", country" with x spaces
#tput cuf $DateColumn # Position to column 27 for date display
# -h needed to turn off formating: https://askubuntu.com/questions/1013954/bash-substring-stringoffsetlength-error/1013960#1013960
cal -h > /tmp/terminal
CalLineCnt=1
Today=$(date +"%d")
# Prefix with space when length < 2
if [[ ${#Today} < 2 ]] ; then
Today=" "$Today
fi
printf "\033[32m" # color green -- see list above.
while IFS= read -r Cal; do
printf "$Cal"
if [[ $CalLineCnt > 2 ]] ; then
# See if today is on current line & invert background
tput cub 22
for (( j=0 ; j <= 18 ; j += 3 )) ; do
Test=${Cal:$j:2} # Current day on calendar line
if [[ "$Test" == "$Today" ]] ; then
printf "\033[7m" # Reverse: [ 7 m
printf "$Today"
printf "\033[0m" # Normal: [ 0 m
printf "\033[32m" # color green -- see list above.
tput cuf 1
else
tput cuf 3
fi
done
fi
tput cud1 # Down one line
tput cuf $DateColumn # Move 27 columns right
CalLineCnt=$((++CalLineCnt))
done < /tmp/terminal
printf "\033[00m" # color -- bright white (default)
echo ""
tput rc # Restore saved cursor position.
#-------- TIME --------------------------------------------------------------
tput sc # Save cursor position.
# Move up 9 lines
i=0
while [ $((++i)) -lt 10 ]; do tput cuu1; done
tput cuf $TimeColumn # Move 49 columns right
# Do we have the toilet package?
if hash toilet 2>/dev/null; then
echo " "$(date +"%I:%M %P")" " | \
toilet -f future --filter border > /tmp/terminal
# Do we have the figlet package?
elif hash figlet 2>/dev/null; then
echo $(date +"%I:%M %P") | figlet > /tmp/terminal
# else use standard font
else
echo $(date +"%I:%M %P") > /tmp/terminal
fi
while IFS= read -r Time; do
printf "\033[01;36m" # color cyan
printf "$Time"
tput cud1 # Up one line
tput cuf $TimeColumn # Move 49 columns right
done < /tmp/terminal
tput rc # Restore saved cursor position.
exit 0
Table of Contents
Prerequisites
For the fancy time display you need to install toilet:
sudo apt install toilet
For another fancy time display (but not quite as fancy) install figlet:
sudo apt install figlet
Otherwise the time will be displayed in βnormalβ font.
Weather
Weather is provided by the curl wttr.in/cityname?0 command. In your terminal use: curl wttr.in/:help for additional details.
Weather: Change city name
Youβll want to modify this section of code and change Edmonton to your city name:
# Replace Edmonton with your city name, GPS, etc. See: curl wttr.in/:help
curl wttr.in/Edmonton?0 --silent --max-time 3
# Timeout #. Increase for slow connection---^
Unicode is supported for city names like /ΠΠΎΡΠΊΠ²Π° (Moscow). Airport letters are supported such as YEG for Edmonton.
Weather: Remove country name
When terminal is set for 92 characters wide, the weather displays as βEdmonton, Canada.β which is too long for my liking:
Worse yet when terminal is set for default 80 characters wide:
To circumvent the problem, β, Countrynameβ is blanked out on the screen with this code:
# Depending on length of your city name and country name you will:
# 1. Comment out next three lines of code. Uncomment fourth code line.
# 2. Change subtraction value and set number of print spaces to match
# subtraction value. Then place comment on fourth code line.
Column=$(($DateColumn - 10))
tput cuf $Column # Move x column number
printf " " # Blank out ", country" with x spaces
#tput cuf $DateColumn # Position to column 27 for date display
If you need help with this part of the script please post comment below for assistance.
Terminal screen width adjustments
Adjust the spacing to your terminal screen width by changing:
# Setup for 92 character wide terminal
DateColumn=34 # Default is 27 for 80 character line, 34 for 92 character line
TimeColumn=61 # Default is 49 for " " " " 61 " " " "
Tying it all together in ~/.bashrc
Edit your ~/.bashrc file and add these lines to the bottom:
# Splash Calendar and time
now
# ASCII Linux distribution display
screenfetch
Save the `~/.bashrcβ file changes.
To display the Ubuntu information you need screenfetch:
sudo apt install screenfetch
There are similar display packages to screenfetch so shop around!
If you want the same command prompt with βββββββββββ dividing line between commands, change these lines:
if [ "$color_prompt" = yes ]; then
PS1='βββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]\$ '
else
PS1='βββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
${debian_chroot:+($debian_chroot)}\u@\h:\w\$ '
fi
unset color_prompt force_color_prompt
Note the length of the separator line coincides with width of screenfetch output. In this case it is 92 characters wide and gnome-terminal preferences are set accordingly.