deb包中preinst、postinst、prerm、postrm等脚本的执行顺序及参数
1、首次安装deb (dkpg -i)
调用顺序：
preinst -> postinst
各调用程序$1对应参数：
preinst: install
postinst: configure
2、卸载 (dpkg -r)
调用顺序：
prerm -> postrm
各调用程序$1对应参数：
prerm : remove
postrm : remove
prerm -> postrm -> postrm
各调用程序$1对应参数：
prerm : remove
postrm : remove
postrm : purge
4、升级 (dpkg -i 同一个软件包)
调用顺序：
prerm -> preinst -> postrm -> postinst
各调用程序$1对应参数：
prerm: upgrade newversion (e.g.: ****** prerm upgrade 2.7.1-22 )
preinst: upgrade oldversion newversion (e.g.: ****** preinst upgrade 2.7.1-21 2.7.1-22)
postrm: upgrade newversion (e.g.: ****** postrm upgrade 2.7.1-22)
postinst: configure oldversion (e.g.: ****** postinst configure 2.7.1-21)
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prerm: remove upgrade
postrm: remove purge upgrade
preinst: install upgrade
postinst: configure
