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RHCSA Redhat – Questions With Complete Solutions
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RHCSA Redhat – Questions With Complete Solutions
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RHCSA Redhat – Questions With Complete SolutionsRepeat last command Right Ans - !!
Repeat last argument in current command Right Ans - !$
Kernel log message command Right Ans - dmesg
File usage Right Ans - du -hsx
h - human, s - summarize,
x - single fs
Umount a busy drive Right Ans - kill -9 'lsof +D /mnt/cdrom'
(list open files, +D=directory and contents)
Compare file contents Right Ans - diff
Search for all gzip files, not dirs Right Ans - find -type f -name *.gz
Command to tell crond what to do Right Ans - crontab
crontab order Right Ans - Min, hour, date, month, day, command
Show what's in crond Right Ans - crontab -l
Turn on firewall for run levels 2-5 Right Ans - chkconfig iptables on
Check if <cmd> is running Right Ans - service <cmd> status <=old
systemctl status <cmd> <=new
Set tasks for crond Right Ans - crontab -e
e = edit
Mail location Right Ans - /var/spool/mail
Command to check messages Right Ans - mail
Check <cmd> run level schedule Right Ans - chkconfig --list <cmd>
,Print a file's number of lines Right Ans - wc -I <file>
l=line
User account commands Right Ans - useradd, userdel, usermod
usermod switches Right Ans - G second group, g main group, u user ID
num, d home, s shell
Set user password Right Ans - passwd --stdin <user>
Delete user account AND home dir Right Ans - userdel -r
r = remove
Force user password change Right Ans - chage -d 0 <user>
change + age
-d = last day
Group-file field categories Right Ans - /etc/group gname:x:gid:users
User account lock cmd Right Ans - usermod -L or -U <usr>
U = unlock
Check if user account is locked Right Ans - less /etc/passwd
user:! means locked
:!! means no password set
Show password parameters Right Ans - chage -l <login>
l = list
Set password max life Right Ans - chage -M <# of days>
Firewall settings GUI Right Ans - system-config-firewall
Scan for open ports Right Ans - netstat -tulpn (as root)
nmap 192.168.1.10
tu=tcp/udp, l=only listening, p=sh pid, n=numeric address
Yum repo location Right Ans - /etc/yum.repos.d
,Turn <cmd> on for important run levels Right Ans - chkconfig <cmd> on
cmd to see if crond is running Right Ans - ps -ef | grep crond
e=every process, f=ASCII process hierarchy
or
service crond status <=old
systemctl status crond <=new
start crond Right Ans - service crond start <=old
systemctl start crond <=new
turn <cmd> on for important run levels Right Ans - chkconfig <cmd> on
check what levels <cmd> is set to run at Right Ans - chkconfig --list <cmd>
cmd to set instructions for crond Right Ans - crontab -e
script comment symbol Right Ans - #
crontab format Right Ans - min hr date month day command
what day number is Sunday Right Ans - zero
cmd to get crontab help Right Ans - man 5 crontab
cmd to view email Right Ans - mail
where are emails stored Right Ans - /var/spool/mail
show list of crond tasks Right Ans - crontab -l
Be careful of this when creating crond tasks Right Ans - the created task
will run as the user you are logged in as
cmd for disk usage Right Ans - du -hsx
h - human, s - summarize, x - single fs
cmd to find all open instances of cdrom Right Ans - lsof +D /dev/cdrom
list open files, +D is for all instances and included files
, repeat previous argument Right Ans - !$
cmd to repeat most recent command Right Ans - !!
cmd to search in / for files named "root" (not dirs) Right Ans - find / -type f
-name root
What values do you set to staticly assign an IP to eth0 at system startup
Right Ans - /etc/sysconfig/network-scripts/ifcfg-eth0 =>
ONBOOT=YES
PROTO=none
DNS server settings are stored here Right Ans - /etc/resolve.conf
remember this if you change any network config Right Ans - service
network restart <=old
systemctl restart network <=new
what if no DNS server Right Ans - /etc/hosts is used as a sort of DNS cache
file
where do you make a hostname change permanent Right Ans -
/etc/sysconfig/network
cmd to temp change hostname Right Ans - hostname
how do you get into the grub loader at boot up Right Ans - hold down shift
how do you apply grub config changes Right Ans - update-grub
how do you change to single user mode during bootup Right Ans - enter
grub loader (hold shift during boot), hit e to edit, edit kernel argument, put a
"1" (one) at the very end of the line
cmd to show if selinux is enabled/installed Right Ans - getenforce
hint=security, law enforcement
cmd to start the environment GUI Right Ans - startx
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