rwxrob-dot/opacity at main - rwxrob-dot - blob42 source forge

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 #!/bin/sh
 test -z "$1" && exit 1
 yml="$HOME/.config/alacritty/alacritty.yml"
 perl -p -i -e 's/^background_opacity:\s*\S+/background_opacity: .'$1'/' $yml