用法·
双园括号((...))：
用于算术表达式。
支持标准算术运算符，如==!=
单方括号[...]和双括号[[...]]：
用于测试表达式。
支持数字比较运算符，如-le，，，，，，。-lt-ge-gt-eq-ne
示例脚本
#!/usr/bin/bash
x=3
#Using((...))forarithmeticcomparison
if((x="$b"))
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Unix1998
later add
博文
(2024-07-01 08:00:53)
(2024-06-29 18:29:47)
美国战略目的是保证能随便印发钞票，中国需要台湾回归，
是否可以，中国支持美金，发行一部分美金并在香港东南各省流通，台湾名义上归属大陆，大陆再把福建加上内地一些地区，送给台湾，实行台湾制度，
这样美国可以发行更多地美金，中国名义上收回台湾，中美和平，不再冷热战，共同管理世界。
乌东国际共管，俄罗斯远东或加拿大划一块面积条件相近的土[阅读全文]
(2024-06-04 07:04:11)
看到美国加拿大中国很多医院能做胰腺的的微创手术，但是加拿大的医疗体系似乎有些问题，家庭医生和专科医生在没有生命危险的情况,坚决拒绝讨论这个问题。如果生长到几厘米需要whipplesurgery的话，胰腺，十二指肠，胃等需要切除，还要链接血管，似乎是10小时或更长的手术。
那位网友在美国加拿大中国做过或听说过微创手术，LaparoscopicSurgery，希望能分享一些信息
谢[阅读全文]
(2024-05-09 17:30:27)
InOpenShift,loadbalancers,Ingresscontrollers,andNodePortareallcomponentsrelatedtomanaginganddirectingnetworktrafficwithinaKubernetescluster.1.**LoadBalancers**:Loadbalancersareresponsiblefordistributingincomingnetworktrafficacrossmultiplebackendservers,ensuringhighavailabilityandreliabilityofapplications.InOpenShift,loadbalancerscanbeusedtodistributetraffictovariouspods(instancesofapplications)run...[阅读全文]
(2024-05-09 15:25:38)
hefiledefinesvariousaspectsofyourapplicationdeployment,including: Containerimagetouse Numberofreplicas(pods)torun ResourcerequestsandlimitsforCPUandmemory Environmentvariablesforyourapplication Portmappingsforcontainerizedapplications Volumemountsforpersistentstorage Networkconfigurations(optional) Securityconfigurations(optional) BenefitsofUsingManifestFiles: Declarative:Theyspecifythe...[阅读全文]
(2024-05-09 12:00:21)
Here'showwecankeepandbackupyourjobsandconfigurationdatabeforeupgradingJenkinsDockerinstance:1.BackupJenkinsConfigurationDirectory: IdentifytheVolume:First,locatethevolumethatstoresJenkinsconfigurationdata.Bydefault,it'softennamedjenkins_homeinDockerdeployments.Youmighthavemountedthisvolumetoaspecificdirectoryonyourhostmachineduringinitialsetup. BackuptheDirectory:Useacommandlikedockercp<...[阅读全文]
(2024-05-09 11:16:07)
Inmostcases,theclusterIPandnodeIPaddressesofaKubernetesorOpenShiftclusterareinternalandnotdirectlyaccessiblefromoutsidethecluster'snetwork.TheseinternalIPsaretypicallyassignedfromprivateIPaddressrangesdefinedbyRFC1918(e.g.,10.0.0.0/8,172.16.0.0/12,or192.168.0.0/16)andareusedforcommunicationbetweenthenodesandcomponentswithinthecluster.Here'sabreakdownoftheseterms:1.**ClusterIP**:Thisisanint...[阅读全文]
(2024-05-03 16:08:15)
thefourmostcommonlyusedHTTPmethods(alsoreferredtoasverbs)are: GET:Usedtoretrievedatafromtheserver.Itshouldonlyretrievedataandshouldhavenoothereffectontheserver. POST:Usedtosenddatatotheservertocreateanewresource.Itcanalsobeusedtosubmitformdatatotheserver. PUT:Usedtoupdateanexistingresourceontheserver.Theentireresourceisreplacedwiththenewrepresentationprovidedintherequest. PATCH:Usedtoupdate...[阅读全文]
(2024-04-29 16:29:02)
Here'sageneraloverviewofthestepsinvolved: InstallPostgreSQLorMySQL:Dependingonyourpreferenceandrequirements,youcanchooseeitherPostgreSQLorMySQLasthebackenddatabaseforAirflow.Installthechosendatabasesystemfollowingitsinstallationinstructions. CreateaDatabase:AfterinstallingPostgreSQLorMySQL,createanewdatabaseforAirflowtouse.Youcandothisusingtherespectivedatabasemanagementtoolsorcommand-linei...[阅读全文]
(2024-04-29 16:27:10)
fromairflowimportDAG
fromairflow.operators.ssh_operatorimportSSHOperator
fromdatetimeimportdatetimedefault_args={
'owner':'airflow',
'depends_on_past':False,
'start_date':datetime(2024,4,29),
'email_on_failure':False,
'email_on_retry':False,
'retries':1
}dag=DAG('ssh_example',default_args=default_ar...[阅读全文]
fromairflow.operators.ssh_operatorimportSSHOperator
fromdatetimeimportdatetimedefault_args={
'owner':'airflow',
'depends_on_past':False,
'start_date':datetime(2024,4,29),
'email_on_failure':False,
'email_on_retry':False,
'retries':1
}dag=DAG('ssh_example',default_args=default_ar...[阅读全文]
