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lang-bash
$'\033[38;5;2m'and$'\033[0m\n'parts are ANSI escape codes. The first one colors the contents of$prompt_historyand the second resets the color to your terminals default.prompt_historytwice? Why does it need first the$()and then the{:7}? I think it has to do with executing the command every time instead of caching, but what are the rules on that? Is that why it's written how it is?history 1prints a number before the command. As far as I know you can't directly perform string manipulation like${:7}on the result of a command substitution in bash, hence the temporary variable. See my revised answer.