[求助]。求高手帮忙。谢谢了。

shopt -s checkwinsize
    [ "$PS1" = "[url="file://\s-\v\$"]\\s-\\v\\\$[/url] " ] && PS1="[\u@\h \W]\\$ "

    if [ "x$SHLVL" != "x1" ]; then # We're not a login shell
        for i in /etc/profile.d/*.sh; do
        if [ -r "$i" ]; then
            . $i
        fi
    done
    fi
fi
求高手帮忙解释解释呀。谢高手帮忙......