7/31/2019 ibm ques

1/4

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

7/31/2019 ibm ques

2/4

-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

7/31/2019 ibm ques

3/4

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

7/31/2019 ibm ques

4/4

#dmesg|grepRAM

TherearethreeanotherwaytocheckmemoryonLinux

1:-free-t-m2:vmstat3:top

Q.PatchmanagementusingRHN