How yo output file using bash coloring? - bash

Question

I would like to print a MOTD using styled text when an user connects to the server (ubuntu 18.04) using SSH.
The only way I found is to print the file by myself because Ubuntu originally only cats the motd file.
So now, I have a colord motd file but I don't found any way to print out the contents with the style.
I found this command on stackoverflow:
cat /home/user/conf/bash/motd | sed 's/$/\\n/' | sed 's/ /\\a /g'
But this is not working propertly with large ASCII text.
here is the current test motd file
____ ____ ________ _____ ______ ___ ____ ____ ________
|_ _| |_ _||_ __ ||_ _| .' ___ | .' `.|_ \ / _||_ __ |
\ \ /\ / / | |_ \_| | | / .' \_|/ .-. \ | \/ | | |_ \_|
\ \/ \/ / | _| _ | | _ | | | | | | | |\ /| | | _| _
\ /\ / _| |__/ | _| |__/ |\ `.___.'\\ `-' /_| |_\/_| |_ _| |__/ |
\/ \/ |________||________| `.____ .' `.___.'|_____||_____||________|
Welcome to my Server !
Aliases:
\e[4ml\e[0m => ls -lA
\e[1;93mll\e[0m => ls -l
Have you any solution to do it please ?

Answer 1

Hi i'm using my color table when i need colors in scripts. Here it is.
#!/bin/bash
#--------------------------------------------------------------------+
#Color picker, usage: printf ${BLD}${CUR}${RED}${BBLU}"Hello!)"${DEF}|
#-------------------------+--------------------------------+---------+
# Text color | Background color | |
#-----------+-------------+--------------+-----------------+ |
# Base color|Lighter shade| Base color | Lighter shade | |
#-----------+-------------+--------------+-----------------+ |
BLK='\e[30m'; blk='\e[90m'; BBLK='\e[40m'; bblk='\e[100m' #| Black |
RED='\e[31m'; red='\e[91m'; BRED='\e[41m'; bred='\e[101m' #| Red |
GRN='\e[32m'; grn='\e[92m'; BGRN='\e[42m'; bgrn='\e[102m' #| Green |
YLW='\e[33m'; ylw='\e[93m'; BYLW='\e[43m'; bylw='\e[103m' #| Yellow |
BLU='\e[34m'; blu='\e[94m'; BBLU='\e[44m'; bblu='\e[104m' #| Blue |
MGN='\e[35m'; mgn='\e[95m'; BMGN='\e[45m'; bmgn='\e[105m' #| Magenta |
CYN='\e[36m'; cyn='\e[96m'; BCYN='\e[46m'; bcyn='\e[106m' #| Cyan |
WHT='\e[37m'; wht='\e[97m'; BWHT='\e[47m'; bwht='\e[107m' #| White |
#----------------------------------------------------------+---------+
# Effects |
#--------------------------------------------------------------------+
DEF='\e[0m' #Default color and effects |
BLD='\e[1m' #Bold\brighter |
DIM='\e[2m' #Dim\darker |
CUR='\e[3m' #Italic font |
UND='\e[4m' #Underline |
INV='\e[7m' #Inverted |
COF='\e[?25l' #Cursor Off |
CON='\e[?25h' #Cursor On |
#--------------------------------------------------------------------+
# Text positioning, usage: XY 10 10 "Hello World!" |
XY () { printf "\e[${2};${1}H${3}"; } # |
#--------------------------------------------------------------------+
# Print line, usage: line - 10 | line -= 20 | line "Hello World!" 20 |
line () { printf -v LINE "%$2s"; printf -- "${LINE// /$1}"; } # |
# Create sequence like {0..X} |
cnt () { printf -v _N %$1s; _N=(${_N// / 1}); printf "${!_N[*]}"; } #|
#--------------------------------------------------------------------+
welcome=(''
$RED" ____ ____ ________ _____ ______ ___ ____ ____ ________ \n"$DEF
$RED"|_ _| |_ _||_ __ ||_ _| .' ___ | .' \`.|_ \ / _||_ __ | \n"$DEF
$GRN" \ \ /\ / / | |_ \_| | | / .' \_|/ .-. \ | \/ | | |_ \_| \n"$DEF
$GRN" \ \/ \/ / | _| _ | | _ | | | | | | | |\ /| | | _| _ \n"$DEF
$BLU" \ /\ / _| |__/ | _| |__/ |\ \`.___.'\\\\\ \`-' /_| |_\/_| |_ _| |__/ |\n"$DEF
$BLU" \/ \/ |________||________| \`.____ .' \`.___.'|_____||_____||________| \n"$DEF
)
printf "${welcome[*]}"

Answer 2

I would use variable in my file but It's seems that parsing variable implies parsing other things so it's not compatible with the banner that is ASCII only.
So I exported the banner to another file and now, I am able to print color and the banner.
Here is the SH sample
RED="\e[31m"
BANNER=$(<banner.txt)
printf "$(eval "echo \"$(<myfile.txt)\"")"
banner.txt
____ ____ ________ _____ ______ ___ ____ ____ ________
|_ _| |_ _||_ __ ||_ _| .' ___ | .' `.|_ \ / _||_ __ |
\ \ /\ / / | |_ \_| | | / .' \_|/ .-. \ | \/ | | |_ \_|
\ \/ \/ / | _| _ | | _ | | | | | | | |\ /| | | _| _
\ /\ / _| |__/ | _| |__/ |\ `.___.'\\ `-' /_| |_\/_| |_ _| |__/ |
\/ \/ |________||________| `.____ .' `.___.'|_____||_____||________|
myfile.txt
$BANNER
Welcome to my Server !
TEXT FIRST
${RED}TEXT IS RED
\e[34mTEXT IS BLUE\e[0m
TEXT THIRD
I am now looking for a prettier solution.