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RHCSA Exam Study Guide with Complete Solutions
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RHCSA Exam Study Guide with Complete Solutions Repeat last command - Answer️️ -!! Repeat last argument in current command - Answer️️ -!$ Kernel log message command - Answer️️ -dmesg File usage - Answer️️ -du -hsx h - human, s - summarize, x - single fs Umount a busy drive - A...

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  • August 28, 2024
  • 49
  • 2024/2025
  • Exam (elaborations)
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  • rhcsa exam study guide with complete solutions

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©SOPHIABENNET@2024/2025 Tuesday, August 20, 2024 10:21 AM

RHCSA Exam Study Guide with Complete Solutions

Repeat last command - Answer✔️✔️-!!

Repeat last argument in current command - Answer✔️✔️-!$

Kernel log message command - Answer✔️✔️-dmesg

File usage - Answer✔️✔️-du -hsx

h - human, s - summarize,

x - single fs

Umount a busy drive - Answer✔️✔️-kill -9 'lsof +D /mnt/cdrom'

(list open files, +D=directory and contents)

Compare file contents - Answer✔️✔️-diff

Search for all gzip files, not dirs - Answer✔️✔️-find -type f -name *.gz

Command to tell crond what to do - Answer✔️✔️-crontab

crontab order - Answer✔️✔️-Min, hour, date, month, day, command

Show what's in crond - Answer✔️✔️-crontab -l

Turn on firewall for run levels 2-5 - Answer✔️✔️-chkconfig iptables on

Check if <cmd> is running - Answer✔️✔️-service <cmd> status <=old

systemctl status <cmd> <=new

Set tasks for crond - Answer✔️✔️-crontab -e


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, ©SOPHIABENNET@2024/2025 Tuesday, August 20, 2024 10:21 AM

e = edit

Mail location - Answer✔️✔️-/var/spool/mail

Command to check messages - Answer✔️✔️-mail

Check <cmd> run level schedule - Answer✔️✔️-chkconfig --list <cmd>

Print a file's number of lines - Answer✔️✔️-wc -I <file>

l=line

User account commands - Answer✔️✔️-useradd, userdel, usermod

usermod switches - Answer✔️✔️-G second group, g main group, u user ID
num, d home, s shell

Set user password - Answer✔️✔️-passwd --stdin <user>

Delete user account AND home dir - Answer✔️✔️-userdel -r

r = remove

Force user password change - Answer✔️✔️-chage -d 0 <user>

change + age

-d = last day

Group-file field categories - Answer✔️✔️-/etc/group gname:x:gid:users

User account lock cmd - Answer✔️✔️-usermod -L or -U <usr>

U = unlock




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, ©SOPHIABENNET@2024/2025 Tuesday, August 20, 2024 10:21 AM

Check if user account is locked - Answer✔️✔️-less /etc/passwd

user:! means locked

:!! means no password set

Show password parameters - Answer✔️✔️-chage -l <login>

l = list

Set password max life - Answer✔️✔️-chage -M <# of days>

Firewall settings GUI - Answer✔️✔️-system-config-firewall

Scan for open ports - Answer✔️✔️-netstat -tulpn (as root)

nmap 192.168.1.10

tu=tcp/udp, l=only listening, p=sh pid, n=numeric address

Yum repo location - Answer✔️✔️-/etc/yum.repos.d

Turn <cmd> on for important run levels - Answer✔️✔️-chkconfig <cmd> on

cmd to see if crond is running - Answer✔️✔️-ps -ef | grep crond

e=every process, f=ASCII process hierarchy

or

service crond status <=old

systemctl status crond <=new

start crond - Answer✔️✔️-service crond start <=old




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, ©SOPHIABENNET@2024/2025 Tuesday, August 20, 2024 10:21 AM

systemctl start crond <=new

turn <cmd> on for important run levels - Answer✔️✔️-chkconfig <cmd> on

check what levels <cmd> is set to run at - Answer✔️✔️-chkconfig --list
<cmd>

cmd to set instructions for crond - Answer✔️✔️-crontab -e

script comment symbol - Answer✔️✔️-#

crontab format - Answer✔️✔️-min hr date month day command

what day number is Sunday - Answer✔️✔️-zero

cmd to get crontab help - Answer✔️✔️-man 5 crontab

cmd to view email - Answer✔️✔️-mail

where are emails stored - Answer✔️✔️-/var/spool/mail

show list of crond tasks - Answer✔️✔️-crontab -l

be careful of this when creating crond tasks - Answer✔️✔️-the created task
will run as the user you are logged in as

cmd for disk usage - Answer✔️✔️-du -hsx

h - human, s - summarize, x - single fs

cmd to find all open instances of cdrom - Answer✔️✔️-lsof +D /dev/cdrom

list open files, +D is for all instances and included files

repeat previous argument - Answer✔️✔️-!$


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