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Q.Howtocheckenvironmentvariablesenv
Q.Howtocheckallsystem-widevariablesset-a
Q.WhatisACLQ.Howtocheckaclofanyfilegetfaclfile_namegetfacl-a===tocheckallacls
Q.Howtosetaclinparticulardirectorysetfacl-md:u::
Q.Whatisstickybit
Q.Howtocheckuserpasswordage,expiryetc..chageusername
Q.entriesin/etc/shadowfile
Q.Whatisthediffbetweenat&crontab
Q.Crontabentrydetails
minshoursday(1-31)month(1-12)week(1-7)command
Q.INplaceof"dayofweek",0denoteswhat?SUNDAY
Q.Disablerootlogin
root/sbin/nologin
switch
Q.Howtorebuildtheinitrd
mkinitrdcommand-whatdoesthiscommanddomkinitrd/boot/initrd........img
Q.Commandtoconfigureraidmdadm
Q.WhatisthedifferencebetweenRaid1andRaid5
Q.5diskintoraid5,100GBeach.Howmuchstorageyouwillget,raid5formula400GBFormulaism-1or(totalnoofdisks-1)
Q.Howtocheckdiskusagefoharddisksdf-hdu-hQ.Backupcommandtar
ThirdPartyutility-Veritas
Q.Whatissignal?Twotypes-SigtermandSigkill
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-1(HUP)-Hangupsignal,Rereadtheconfigfile-9 -Killsignal-15 -terminationsignal
Q.WhatisDHCP,itsdaemon,configfiledaemon-dhcpdconfigfile-/etc/dhcpd.confdatabasefile-/var/lib/dhcp/dhcpd-leases
Q.whatissymlinks?TypesTwo-SoftlinkandHardlink
Q.Whatisumask?umaskforuser-002umaskforroot-022
Q.Whatisthedefualtvalueofpermissionofthefilesanddirectoriescreatedbyrootwithumask022Forfiles-644Fordirectories-755
Q.Whatisfstab?Itsentry.filesystemtable
Q.LOgsaresavedinwhichlocation/var/log/
Q.HowtosetsyslogoptionssothatclientsystemrelatedmsgsstoredinsyslogserverUSe'-r'oprtionin/etc/sysconfig/syslogfileinsyslogserverInclient,add'authpriv.* @ip_add_of_syslog_server'in/etc/syslog.conf.
Q.Whatisinit3&5.Init1usage
singleusermode,rootpasswd
Q.Howtochecklabelofmountedfilesysteme2labelcommand
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Q.Howtocheckallmountedfilesystemmountmount-a
Q.CommandtogetMachineconfiguration
I) Name:arch-printmachinearchitectureSynopsis:archDescription:archisdeprecatedcommandsincereleaseutil-linux2.13.U
seuname-m.
OncurrentLinuxsystems,archprintsthingssuchas"i386","i486","i586","alpha","sparc","arm","m68k","mips","ppc".
II) Name:uname-printsysteminformationSynopsis:uname[OPTION]...Description:Printcertainsysteminformation.WithnoOPTION,sameas-
s.
-a,--allprintallinformation,inthefollowingorder,exceptomit-pand-i
ifunknown:-s,--kernel-nameprintthekernelname-n,--nodenameprintthenetworknodehostname-r,--kernel-releaseprintthekernelrelease-v,--kernel-versionprintthekernelversion-m,--machine
printthemachinehardwarename-p,--processorprinttheprocessortypeor"unknown"-i,--hardware-platformprintthehardwareplatformor"unknown"-o,--operating-systemprinttheoperatingsystem--helpdisplaythishelpandexit--versionoutputversioninformationandexit
III)sam,clickonPerformanceMonitorsSectionandthenclickonSystemProp
erties.ThereyoucanopenThecategoryprocessorandyouwillhaveyoursolution.
IV)YoucanfindsomeCPUinfosin"machinfo"command,whichwillreturnsthenumberofcores.
V)Togetthenumberofsockets(physicalprocessors)fromthepsp_socket_idinpstat_getprocessor().
VI)TochecktheRAMsize
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#dmesg|grepRAM
TherearethreeanotherwaytocheckmemoryonLinux
1:-free-t-m2:vmstat3:top
Q.PatchmanagementusingRHN