什么是Patch?
简单的说，补丁就是一些替换现存的文件和目录的文件目录集合。补丁纠正应用程序的错误或增加功能。
Patch编号
每个补丁都有编号。例如补丁号为101945，版本是34的话，这个补丁的目录名就是101945-34.

patchadd命令用于安装补丁:
# cd /tmp
# ls
105160-01 ps_data sdt_fl8zKOI_
# patchadd 105160-01
Checking installed packages and patches...
Verifying sufficIEnt filesystem capacity (dry run method)
Installing patch packages...
Patch number 105160-01 has been successfully installed.
See /var/sadm/patch/105160-01/log for details
Patch packages installed:
SUNWdtbas

patchrm用于删除补丁
# patchrm 105633-06
Checking installed packages and patches...
Patch 105633-06 has been backed out.
#

下面的命令用于检查系统的补丁情况
# patchadd -p
Patch: 105160-05 Obsoletes: Requires: Incompatibles:Packages: SUNWdtbas
# showrev -p
Patch: 105160-05 Obsoletes: Requires:Incompatibles: Packages: SUNWdtbas

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