没有yum命令参数的情况： 当你在Linux系统中输入yum命令而没有提供任何参数时，系统会默认显示yum命令的帮助信息，以下是一个典型的帮助信息输出：
Usage: yum [options] [command] [package …]
Options:
h, help display this help and exit
V, version display the version of yum and exit
q, quiet quiet command output
y, assumeyes assume "yes" in all yes/no prompts
assumeno assume "no" in all yes/no prompts
c, config <config> specify a configuration file
cacheonly only use cache
enablerepo=<repo> enable repository
disablerepo=<repo> disable repository
noplugins do not load plugins
nogpgcheck do not perform GPG checks on packages
repoquery=<repo> query a repository
repoid=<repo> specify a repository id
disablerepo=<repo> disable repository ( Overrides enablerepo )
enablerepo=<repo> enable repository ( Overrides disablerepo )
erroronfail stop on the first error seen
disableplugin=<plugin> disable a plugin
enablerepo=<repo> enable repository
disablegroupupdate disable updating of groups
skipbroken skip packages with unresolvable dependencies
showduplicates show all available versions of packages
obsoletes show the packages that would be replaced by the best version
best show only the best version of each package
allmatches show all matches when searching, not just the best
groupinstall=<group> install a package group
groupupdate update a package group
groupremove=<group> remove a package group
grouplist list a package group
dumpcache dump the cache to stdout
cleancache clean yum cache
clean metadata clean yum metadata
destdir=<dir> specify an install directory
installroot=<dir> specify a root directory to install to
obsoletes show the packages that would be replaced by the best version
best show only the best version of each package
debug enable debug mode
syslog log to syslog
quiet quiet command output
verbose verbose command output
bugreport prepare a bug report by gathering debugging information
bugzilla prepare a bug report by gathering debugging information
bugzillaemail=<email> send bug report to bugzilla using the specified email
bugzillabugzilla=<bugzilla> specify bugzilla server to send bug report
bugzillaproduct=<product> specify bugzilla product to send bug report
bugzillacomponent=<component> specify bugzilla component to send bug report
bugzillacc=<cc> specify bugzilla cc to send bug report
bugzillabts=<bts> specify bugzilla bts to send bug report
bugzillaccproduct=<cc_product> specify bugzilla cc product to send bug report
bugzillacccomponent=<cc_component> specify bugzilla cc component to send bug report
bugzillaccbts=<cc_bts> specify bugzilla cc bts to send bug report
bugzillahelp display bugzilla options and exit
bugzillaversion display bugzilla version and exit
bugzillaoutput=<file> write bug report to a file
bugzillacomment=<comment> add a comment to the bug report
bugzillabtscomment=<bts_comment> add a comment to the bug report
bugzillacccomment=<cc_comment> add a comment to the bug report
bugzillaccproductcomment=<cc_product_comment> add a comment to the bug report
bugzillacccomponentcomment=<cc_component_comment> add a comment to the bug report
bugzillaccbtscomment=<cc_bts_comment> add a comment to the bug report
bugzillahelp display bugzilla options and exit
bugzillaversion display bugzilla version and exit
bugzillaoutput=<file> write bug report to a file
bugzillacomment=<comment> add a comment to the bug report
bugzillabtscomment=<bts_comment> add a comment to the bug report
bugzillacccomment=<cc_comment> add a comment to the bug report
bugzillaccproductcomment=<cc_product_comment> add a comment to the bug report
bugzillacccomponentcomment=<cc_component_comment> add a comment to the bug report
bugzillaccbtscomment=<cc_bts_comment> add a comment to the bug report
bugzillahelp display bugzilla options and exit
bugzillaversion display bugzilla version and exit
bugzillaoutput=<file> write bug report to a file
bugzillacomment=<comment> add a comment to the bug report
bugzillabtscomment=<bts_comment> add a comment to the bug report
bugzillacccomment=<cc_comment> add a comment to the bug report
bugzillaccproductcomment=<cc_product_comment> add a comment to the bug report
bugzillacccomponentcomment=<cc_component_comment> add a comment to the bug report
bugzillaccbtscomment=<cc_bts_comment> add a comment to the bug report
bugzillahelp display bugzilla options and exit
bugzillaversion display bugzilla version and exit
bugzillaoutput=<file> write bug report to a file
bugzillacomment=<comment> add a comment to the bug report
bugzillabtscomment=<bts_comment> add a comment to the bug report
bugzillacccomment=<cc_comment> add a comment to the bug report
bugzillaccproductcomment=<cc_product_comment> add a comment to the bug report
bugzillacccomponentcomment=<cc_component_comment> add a comment to the bug report
bugzillaccbtscomment=<cc_bts_comment> add a comment to the bug report
bugzillahelp display bugzilla options and exit
bugzillaversion display bugzilla version and exit
bugzillaoutput=<file> write bug report to a file
bugzillacomment=<comment> add a comment to the bug report
bugzillabtscomment=<bts_comment> add a comment to the bug report
bugzillacccomment=<cc_comment> add a comment to the bug report
bugzillaccproductcomment=<cc_product_comment> add a comment to the bug report
bugzillacccomponentcomment=<cc_component_comment> add a comment to the bug report
bugzillaccbtscomment=<cc_bts_comment> add a comment to the bug report
bugzillahelp display bugzilla options and exit
bugzillaversion display bugzilla version and exit
bugzillaoutput=<file> write bug report to a file
bugzillacomment=<comment> add a comment to the bug report
bugzillabtscomment=<bts_comment> add a comment to the bug report
bugzillacccomment=<cc_comment> add a comment to the bug report
bugzillaccproductcomment=<cc_product_comment> add a comment to the bug report
bugzillacccomponentcomment=<cc_component_comment> add a comment to the bug report
bugzillaccbtscomment=<cc_bts_comment> add a comment to the bug report
bugzillahelp display bugzilla options and exit
bugzillaversion display bugzilla version and exit
bugzillaoutput=<file> write bug report to a file
bugzillacomment=<comment> add a comment to the bug report
bugzillabtscomment=<bts_comment> add a comment to the bug report
bugzillacccomment=<cc_comment> add a comment to the bug report
bugzillaccproductcomment=<cc_product_comment> add a comment to the bug report
bugzillacccomponentcomment=<cc_component_comment> add a comment to the bug report
bugzillaccbtscomment=<cc_bts_comment> add a comment to the bug report
bugzillahelp display bugzilla options and exit
bugzillaversion display bugzilla version and exit
bugzillaoutput=<
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