Lists ebook matches in user's default calibre library by title and (with arg) path.

calibfind.sh

calibfind () 
{ 
    local cmd;
    local title;
    while [[ $# -gt 0 ]]; do
        case "$1" in 
            -h | --h | -help | --help)
                echo "Usage:";
                echo "  calibfind <title>          # list ebook info by title";
                echo "  calibfind -path <title>    # return space-delimited quoted file paths";
                return 0
            ;;
            -path | --path)
                cmd="paths";
                shift;
                title="$1"
            ;;
            *)
                cmd="find";
                title="$1"
            ;;
        esac;
        shift;
    done;
    if [[ -z "$title" ]]; then
        echo "Usage: calibfind [-path] <title>";
        return 1;
    fi;
    case "$cmd" in 
        find)
            ( stty cols 500;
            calibredb list --search "title:$title" -f title )
        ;;
        paths)
            ( stty cols 500;
            calibredb list --search "title:$title" -f formats ) | perl -ne 'print "\"$1\" " if /\[(.*?)\]/'
        ;;
    esac
}

Usage

> calibfind trinity
id title                                          
17 Holy Trinity Monastary Jordanville Prayer Book


> calibfind -path trinity
"/home/user/Calibre Library/Unknown/Holy Trinity Monastary Jordanville Prayer Book (17)/Holy Trinity Monastary Jordanville Prayer - Unknown.epub" laptop:/usr/share/cosmic$