deck_3562949

Question 1

Check OS version

Answer 1

cat /etc/redhat-releaserpm -q centos-release or

Question 2

vi tips - moving the cursor

V - selects entire lines
v - selects range of text

Answer 2

:set number | v - copy:set nonumber | p -paste0 - move cursor to start of line | x - cut+paste:0 - first line$ - move cursor to end of line:$ - last linew - next wordb - preceding word

Question 3

toggle between the last two directories

Answer 3

cd -

Question 4

Use dirs, pushd and popd

to manipulate directory stack

Answer 4

dirspushdpopd

Question 5

vi tips II

% Find matching () { or } d Delete
^l Redraw screen dd Delete line
^r Refresh screen c Change
z Current line at top y

Answer 5

ZZ Exit, saving changes t Up to forward Q Enter ex mode T Back up to End of insert | Go to column : Execute ex command w,W Forward one word :! Shell command b,B Back one word ^g Show filename/size e,E End of word ^f Forward one screen ^h Erase last character ^b Back one screen ^w Erase last word ^d Forward half screen ^? Interrupt ^u Backward half screen ~ Toggle character case G Go to line a Append after / Search forward for i,I Insert before ? Search backward for A Append at end of line n Repeat last search o Open line below N Reverse last search O Open line above ]]fGOTO Next section/function r Replace character [[ Previous section/function R Replace characters

Question 6

vi Options:

autoindent Automatic line indentation
autowrite Write before quit
ignorecase Ignore case in searches
number Display line numbers
showmatch Show matches to ) and } as typed
terse

Answer 6

q Quit set Enable option q! Quit, discard changes set no Disable option r Read in file set all Show all options sh Invoke shell vi Vi mode wq Write and quit w Write file w! Overwrite file /Emilee Tellez

Question 7

verify syslog is installed

Answer 7

rpm -qa | grep syslog

Question 8

verify rsyslog service is set to start

Answer 8

chkconfig rsyslog –listchkconfig rsyslog –level 2345 on

Question 9

ls - no details

Answer 9

ls -a ls -A (no implicit “.” or “..”)ls -aF (classify ex. “/”)

Question 10

ls group directories first

Answer 10

ls –group-directories-first

Question 11

check running level

Answer 11

runlevel

Question 12

change running level

Answer 12

init 3 (0 - 6)

Question 13

GRUB abbreviation

Answer 13

Grand Unified Bootloader

Question 14

grubby –update-kernel=ALL –args=”…”

Answer 14

grubby –update-kernel=ALL –args=”video=hyperv_fb:1024x768”

Question 15

check listening ports with netstat

Answer 15

netstat -ant (all TCP ports numeric list)

Question 16

check listening ports with list open files

Answer 16

lsof -i :8080 (ex port 8080vi /etc/rsysl)

Question 17

restart network service

Answer 17

service network restart

Question 18

Hyper-v install cdrom module

Answer 18

insmod /lib/modules/$(uname -r)/kernel/drivers/ata/ata_piix.kolsmod | grep piixrmmod …

Question 19

The file contains gateway?!? and host info

Answer 19

/etc/sysconfig/network

Question 20

ifconfig add/delete secondary (subinterface) interface

Answer 20

ifconfig eth0:0 10.10.20.218 netmask 255.255.255.0 upifconfig eth0:0 del 10.10.20.218

Question 21

ip address add

Answer 21

ip address add 192.168.99.37/24 dev eth0you can add more than one IP (the additional become secondary)

Question 22

add a permanent secondary IP

Answer 22

cp the existing ifg-ethxthem edit it, removing the gateway and changing the name:DEVICE=eth0:1BOOTPROTO=staticONBOOT=yesIPADDR=10.1.1.2NETMASK=255.255.255.0

Question 23

List all processes

Display tree

Answer 23

ps aux | less-A all processesa all proc on term (+ other users)x —||— (w/o controlling ttys)pstreepgrep firefox get process ID by name

Question 24

kill

Answer 24

kill PID (simply kill a PID)kill -KILL (bypass the program & send to OS kernel)kill -l list signalskill -0 -HUP (restart daemon w Hang-Up signal)kill -9 -KILL

Question 25

grep (case insensitive)

Answer 25

grep -i