Invert the color of an entire line in Bash

Question

I understand that the title may seem a little confusing. However, I have an example, GNU Nano. The Nano editor has this one line at the top whose color is totally inverted.Does anyone know how this can be achieved in Bash script?

Answer 1

That's quite easy, you can try this:

# Reset
reset='\033[0m'

# White Background
BG='\033[47m'

# Black Foreground
FG='\033[0;30m'

# Usage
echo -e "$FG$BG This will print black text on white background $reset"

If you want the whole line:

reset='\033[0m'
BG='\033[47m'
FG='\033[0;30m'

text="A black text on white"
cols=$(tput cols)

# Left Aligned
x=$((cols-${#text}))

printf "$FG$BG%s%*s$reset\n" "$text" $x

# Centered text
x_center=$(((${#text}+cols)/2))
x_rest=$((cols-x_center))

printf "$FG$BG%*s%*s$reset\n" $x_center "$text" $x_rest

Example output:

More detail: https://stackoverflow.com/a/28938235/3689465