A zsh function that prints all the shell commands ran by the current user since the beginning of the today!

today.zsh

#!/usr/bin/env zsh

function today (){
    if [[ 0 -eq $# ]]; then
        lines=10
    else
        lines="$1"
    fi
    
    output=$(fc -lin -$lines)

    filtered=$(echo $output | grep $(date "+%Y-%m-%d"))
    filtered_lines="$(echo $filtered | wc -l)"

    if [[ $lines -eq $filtered_lines ]]; then
        lines=$(($lines * 2))
        today $lines
    else
        echo $filtered
    fi
}