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% Document Info
\author{jj973}
\pdfinfo{
  /Title (sysadmin-juan-s-cheatsheet.pdf)
  /Creator (Cheatography)
  /Author (jj973)
  /Subject (sysadmin Juan's cheatsheet Cheat Sheet)
}

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    \vspace{-7pt}
    {\parbox{\dimexpr\textwidth-2\fboxsep\relax}{\noindent
        \hspace*{-6pt}\includegraphics[width=5.8cm]{/web/www.cheatography.com/public/images/cheatography_logo.pdf}}
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\begin{tabulary}{11cm}{L}
    \vspace{-2pt}\large{\bf{\textcolor{DarkBackground}{\textrm{sysadmin Juan's cheatsheet Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{jj973} via \textcolor{DarkBackground}{\uline{cheatography.com/89671/cs/20410/}}}
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\begin{multicols}{3}
\begin{tabulary}{5.8cm}{LL}
  \SetRowColor{FootBackground}
  \mymulticolumn{2}{p{5.377cm}}{\bf\textcolor{white}{Cheatographer}}  \\
  \vspace{-2pt}jj973 \\
  \uline{cheatography.com/jj973} \\
  \end{tabulary}
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\begin{tabulary}{5.8cm}{L}
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  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Not Yet Published.\\
   Updated 11th December, 2019.\\
   Page {\thepage} of \pageref{LastPage}.
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  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Sponsor}}  \\
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  \vspace{-5pt}
  %\includegraphics[width=48px,height=48px]{dave.jpeg}
  Measure your website readability!\\
  www.readability-score.com
\end{tabulary}
\end{multicols}}




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\begin{multicols*}{4}

\begin{tabularx}{3.833cm}{x{1.30454 cm} x{2.12846 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{commands miscellanea}}  \tn
% Row 0
\SetRowColor{LightBackground}
the ps command, & which shows the status of running processes \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
vimtutor & tutorial for vim \tn 
% Row Count 3 (+ 1)
% Row 2
\SetRowColor{LightBackground}
rmdir & erases directory \tn 
% Row Count 4 (+ 1)
% Row 3
\SetRowColor{white}
whoami & tells what kind of user you are \tn 
% Row Count 6 (+ 2)
% Row 4
\SetRowColor{LightBackground}
passwd & set up password or change the one you have \tn 
% Row Count 8 (+ 2)
% Row 5
\SetRowColor{white}
xemacs ".bashrc" & calls text editor \tn 
% Row Count 10 (+ 2)
% Row 6
\SetRowColor{LightBackground}
cat & scan docs. from conCATenate \tn 
% Row Count 12 (+ 2)
% Row 7
\SetRowColor{white}
ln & let you make links between files \tn 
% Row Count 14 (+ 2)
% Row 8
\SetRowColor{LightBackground}
stty "funtion key" & lets you set up the function keys \tn 
% Row Count 16 (+ 2)
% Row 9
\SetRowColor{white}
stty -a & show the current function key \tn 
% Row Count 18 (+ 2)
% Row 10
\SetRowColor{LightBackground}
stty sane & fix the shell \tn 
% Row Count 19 (+ 1)
% Row 11
\SetRowColor{white}
ls {\emph{{[}"range"{]}}}.{[}"range"{]} & looks for combinations that satisfy specification \tn 
% Row Count 22 (+ 3)
% Row 12
\SetRowColor{LightBackground}
tail -"\#" & displays the last \# of lines of a text file \tn 
% Row Count 24 (+ 2)
% Row 13
\SetRowColor{white}
head -"\#" & displays the first \#of lines of a text file \tn 
% Row Count 26 (+ 2)
% Row 14
\SetRowColor{LightBackground}
less & show less of a text file \tn 
% Row Count 27 (+ 1)
% Row 15
\SetRowColor{white}
awk & organize data in in columns and rows \tn 
% Row Count 29 (+ 2)
% Row 16
\SetRowColor{LightBackground}
sort & sort lines of text files \tn 
% Row Count 30 (+ 1)
\end{tabularx}
\par\addvspace{1.3em}

\vfill
\columnbreak
\begin{tabularx}{3.833cm}{x{1.30454 cm} x{2.12846 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{commands miscellanea (cont)}}  \tn
% Row 17
\SetRowColor{LightBackground}
clear & cleans the screen \tn 
% Row Count 1 (+ 1)
% Row 18
\SetRowColor{white}
man & manual \tn 
% Row Count 2 (+ 1)
% Row 19
\SetRowColor{LightBackground}
du & estimates the file memory usage \tn 
% Row Count 4 (+ 2)
% Row 20
\SetRowColor{white}
free & displays the amount of free and used memory in the system \tn 
% Row Count 7 (+ 3)
% Row 21
\SetRowColor{LightBackground}
df & report file system disk space usage \tn 
% Row Count 9 (+ 2)
% Row 22
\SetRowColor{white}
lsblk & command used to report info about block devices as follows \tn 
% Row Count 12 (+ 3)
% Row 23
\SetRowColor{LightBackground}
fdisk & manipulate disk partion table \tn 
% Row Count 14 (+ 2)
% Row 24
\SetRowColor{white}
uname & print system info \tn 
% Row Count 15 (+ 1)
% Row 25
\SetRowColor{LightBackground}
cat /proc/cpuinfo & cpu info \tn 
% Row Count 17 (+ 2)
% Row 26
\SetRowColor{white}
lscpu & cpu info \tn 
% Row Count 18 (+ 1)
% Row 27
\SetRowColor{LightBackground}
sudo & gets root authority \tn 
% Row Count 19 (+ 1)
% Row 28
\SetRowColor{white}
grep & search for a string in a file \tn 
% Row Count 21 (+ 2)
% Row 29
\SetRowColor{LightBackground}
tar & creates, view or extracts from archive \tn 
% Row Count 23 (+ 2)
% Row 30
\SetRowColor{white}
find & find files with a pattern \tn 
% Row Count 25 (+ 2)
% Row 31
\SetRowColor{LightBackground}
ssh & remotely login \tn 
% Row Count 26 (+ 1)
% Row 32
\SetRowColor{white}
awk & controls output \tn 
% Row Count 27 (+ 1)
% Row 33
\SetRowColor{LightBackground}
gzip & creates a *.gz compressed file \tn 
% Row Count 29 (+ 2)
% Row 34
\SetRowColor{white}
shutdow & turn off the machine \tn 
% Row Count 30 (+ 1)
\end{tabularx}
\par\addvspace{1.3em}

\vfill
\columnbreak
\begin{tabularx}{3.833cm}{x{1.30454 cm} x{2.12846 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{commands miscellanea (cont)}}  \tn
% Row 35
\SetRowColor{LightBackground}
kill & terminates a process \tn 
% Row Count 1 (+ 1)
% Row 36
\SetRowColor{white}
mount & it mounts file \tn 
% Row Count 2 (+ 1)
% Row 37
\SetRowColor{LightBackground}
ifconfig & view the newtwork interrface \tn 
% Row Count 4 (+ 2)
% Row 38
\SetRowColor{white}
whereis & find the address of a specific command \tn 
% Row Count 6 (+ 2)
% Row 39
\SetRowColor{LightBackground}
uptime & show the running time of the system \tn 
% Row Count 8 (+ 2)
% Row 40
\SetRowColor{white}
hostname & displays the system hostname \tn 
% Row Count 10 (+ 2)
% Row 41
\SetRowColor{LightBackground}
cal & show the month calender \tn 
% Row Count 11 (+ 1)
% Row 42
\SetRowColor{white}
bg & sends a process to the background \tn 
% Row Count 13 (+ 2)
% Row 43
\SetRowColor{LightBackground}
df & shows file system disk space \tn 
% Row Count 15 (+ 2)
% Row 44
\SetRowColor{white}
diff & serves to find differences between to files \tn 
% Row Count 17 (+ 2)
% Row 45
\SetRowColor{LightBackground}
lspci & serves to visualize P.C.I. devices \tn 
% Row Count 19 (+ 2)
% Row 46
\SetRowColor{white}
top & used to manage top processes \tn 
% Row Count 21 (+ 2)
% Row 47
\SetRowColor{LightBackground}
ping host & send echo message to the host \tn 
% Row Count 23 (+ 2)
% Row 48
\SetRowColor{white}
dig domain & show the dns specification for the domain \tn 
% Row Count 25 (+ 2)
% Row 49
\SetRowColor{LightBackground}
scp & allows to remotely copy files from one machine to another machine \tn 
% Row Count 28 (+ 3)
% Row 50
\SetRowColor{white}
ip addr & shows ip address and related information \tn 
% Row Count 30 (+ 2)
\end{tabularx}
\par\addvspace{1.3em}

\vfill
\columnbreak
\begin{tabularx}{3.833cm}{x{1.30454 cm} x{2.12846 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{commands miscellanea (cont)}}  \tn
% Row 51
\SetRowColor{LightBackground}
expr & allows to perform some mathematical operations \tn 
% Row Count 2 (+ 2)
% Row 52
\SetRowColor{white}
env & permit to see the current environment variables \tn 
% Row Count 4 (+ 2)
% Row 53
\SetRowColor{LightBackground}
history & shows the last one hundred commands execute in the system \tn 
% Row Count 7 (+ 3)
% Row 54
\SetRowColor{white}
iwlist & displays wireless devices plus configuration files \tn 
% Row Count 10 (+ 3)
% Row 55
\SetRowColor{LightBackground}
locate & find files by name \tn 
% Row Count 11 (+ 1)
% Row 56
\SetRowColor{white}
lshw & display some basic information about the machine \tn 
% Row Count 13 (+ 2)
% Row 57
\SetRowColor{LightBackground}
lsusb & display information about usb \tn 
% Row Count 15 (+ 2)
% Row 58
\SetRowColor{white}
nice & nice - run a program with modified scheduling priority \tn 
% Row Count 18 (+ 3)
% Row 59
\SetRowColor{LightBackground}
pidof & find the process ID of a running program. \tn 
% Row Count 20 (+ 2)
% Row 60
\SetRowColor{white}
split & serves to split large files in to smaller ones \tn 
% Row Count 22 (+ 2)
% Row 61
\SetRowColor{LightBackground}
sum & checksum and count the blocks in a file \tn 
% Row Count 24 (+ 2)
% Row 62
\SetRowColor{white}
watch & execute a program periodically, showing output fullscreen \tn 
% Row Count 27 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{x{1.7165 cm} x{1.7165 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{setting NFS tutorial}}  \tn
% Row 0
\SetRowColor{LightBackground}
sudo yum install nfs-utils nfs-utils-lib & install NFS \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
sudo systemctl enable rpcbind; \$ sudo systemctl start rpcbind; \$ sudo systemctl enable nfs-server; \$ sudo systemctl start nfs-server; \$ sudo systemctl start nfs-lock; \$ sudo systemctl start nfs-idmap & commands to start the service in charge of the service's functionality \tn 
% Row Count 13 (+ 10)
% Row 2
\SetRowColor{LightBackground}
\$ sudo mkdir /NFSsharedFolder; \$ sudo chmod –R 0755 /NFSsharedFolder & commands to create and prepared a folder \tn 
% Row Count 17 (+ 4)
% Row 3
\SetRowColor{white}
\$ sudo nano /etc/export & open nano to modify the export file \tn 
% Row Count 19 (+ 2)
% Row 4
\SetRowColor{LightBackground}
/NFSsharedFolder 172.25.0.0/16(rw,sync,no\_root\_squash,no\_all\_squash) & add this line to the export line \tn 
% Row Count 23 (+ 4)
% Row 5
\SetRowColor{white}
\$ sudo systemctl restart nfs-server & restart the NFS server \tn 
% Row Count 25 (+ 2)
% Row 6
\SetRowColor{LightBackground}
\$ sudo firewall-cmd -{}-permanent -{}-add-port=111/tcp; \$ sudo firewall-cmd -{}-permanent -{}-add-port=875/tcp; \$ sudo firewall-cmd -{}-permanent -{}-add-port=2049/tcp; \$ sudo firewall-cmd -{}-permanent -{}-add-port=20048/tcp; \$ sudo firewall-cmd -{}-permanent -{}-add-port=42955/tcp; \$ sudo firewall-cmd -{}-permanent -{}-add-port=46666/tcp; \$ sudo firewall-cmd -{}-permanent -{}-add-port=54302/tcp; \$ sudo firewall-cmd -{}-reload & commands to open and configure appropriate ports \tn 
% Row Count 46 (+ 21)
\end{tabularx}
\par\addvspace{1.3em}

\vfill
\columnbreak
\begin{tabularx}{3.833cm}{x{1.7165 cm} x{1.7165 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{setting NFS tutorial (cont)}}  \tn
% Row 7
\SetRowColor{LightBackground}
move to the client & to continue the configuration \tn 
% Row Count 2 (+ 2)
% Row 8
\SetRowColor{white}
\$ sudo yum install nfs-utils nfs-utils-lib & also need to install nfs in the client side of the relationship \tn 
% Row Count 6 (+ 4)
% Row 9
\SetRowColor{LightBackground}
\$ sudo systemctl enable rpcbind \$ sudo systemctl start rpcbind \$ sudo systemctl enable nfs-server \$ sudo systemctl start nfs-server \$ sudo systemctl start nfs-lock \$ sudo systemctl start nfs-idma & commands to start appropiate services \tn 
% Row Count 16 (+ 10)
% Row 10
\SetRowColor{white}
\$ sudo mkdir /NFSfolder \$ sudo chmod –R 755 /NFSfolder & create and set up share folder \tn 
% Row Count 19 (+ 3)
% Row 11
\SetRowColor{LightBackground}
\$ sudo nano /etc/fstab & open nano to edit fstab folder \tn 
% Row Count 21 (+ 2)
% Row 12
\SetRowColor{white}
\seqsplit{172.25.22.10:/NFSsharedFolder/} /NFSfolder/ nfs4 defaults 0 0 & add this line to the fstab folder \tn 
% Row Count 24 (+ 3)
% Row 13
\SetRowColor{LightBackground}
\$ sudo mount & use this command to check what was mounted in the specified NFS server \tn 
% Row Count 28 (+ 4)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{x{1.7165 cm} x{1.7165 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{File modification}}  \tn
% Row 0
\SetRowColor{LightBackground}
chown USER FILE & changes the user ownership of a file to the specified user \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
chown USER: FILE & changes the user and the group to the specified user \tn 
% Row Count 6 (+ 3)
% Row 2
\SetRowColor{LightBackground}
chown USER:GROUP FILE & changes the user, and group ownership of the file to the specified user and group respectively \tn 
% Row Count 11 (+ 5)
% Row 3
\SetRowColor{white}
chown :GROUP FILE & changes the group ownership of the file to the specified group \tn 
% Row Count 15 (+ 4)
% Row 4
\SetRowColor{LightBackground}
chgrp GROUP FILE & changes the group ownership of the file to the specified group \tn 
% Row Count 19 (+ 4)
% Row 5
\SetRowColor{white}
chmod {[}0,1,2,4,7{]}{[}0,1,2,4,7{]}{[}0,1,2,4,7{]} & changes readability, writability, and executability of a file to owner, group owner, and everyone respectively \tn 
% Row Count 25 (+ 6)
% Row 6
\SetRowColor{LightBackground}
chmod {[}u(user),g(group),o(others), a(all){]}{[}+,-{]}{[}r(read),w(write),x(execute),t(write to not delete){]} File & adds or removes permission to r,w,x from u,g,o or a \tn 
% Row Count 31 (+ 6)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{x{1.7165 cm} x{1.7165 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{tutorial on how to setup Samba}}  \tn
% Row 0
\SetRowColor{LightBackground}
\$ sudo cp /etc/samba/smb.conf \seqsplit{/etc/samba/smb.conf.backup} & creates backup file in case you mess it up \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
sudo mkdir /SharedFolder/ & create folder to be shared \tn 
% Row Count 5 (+ 2)
% Row 2
\SetRowColor{LightBackground}
\$ sudo chmod -R 755 /SharedFolder/ & set right permissions \tn 
% Row Count 7 (+ 2)
% Row 3
\SetRowColor{white}
\$ sudo firewall-cmd -{}-permanent -{}-zone=public -{}-add-service=samba & set firewall \tn 
% Row Count 11 (+ 4)
% Row 4
\SetRowColor{LightBackground}
\$ sudo firewall-cmd -{}-reload & set firewall \tn 
% Row Count 13 (+ 2)
% Row 5
\SetRowColor{white}
\$ sudo nano /etc/samba/smb.conf & open nano to start the file configuration \tn 
% Row Count 16 (+ 3)
% Row 6
\SetRowColor{LightBackground}
follow instruction in comment & then come back to this line and keep inputting the commands \tn 
% Row Count 19 (+ 3)
% Row 7
\SetRowColor{white}
\$ sudo smbpasswd –a user1 & set up password for user1 \tn 
% Row Count 21 (+ 2)
% Row 8
\SetRowColor{LightBackground}
\$ sudo systemctl enable smb.service; \$ sudo systemctl enable nmb.service; \$ sudo systemctl start smb.service; \$ sudo systemctl start nmb.service & commands to enter testing phase \tn 
% Row Count 29 (+ 8)
% Row 9
\SetRowColor{white}
Move to the client side & and continue \tn 
% Row Count 31 (+ 2)
\end{tabularx}
\par\addvspace{1.3em}

\vfill
\columnbreak
\begin{tabularx}{3.833cm}{x{1.7165 cm} x{1.7165 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{tutorial on how to setup Samba (cont)}}  \tn
% Row 10
\SetRowColor{LightBackground}
\seqsplit{smb://server\_ip\_address} & type in the server connection screen \tn 
% Row Count 2 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{3.833cm}}{the configuration file should look like this:  \newline  \newline {[}Shared Folder{]} \newline path = /SharedFolder \newline read only = no \newline guest ok = yes \newline browsable =yes \newline writable = yes \newline create mask = 0755 \newline directory mask = 0755 \newline workgroup = WORKGROUP \newline  \newline then save and create user1.}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
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\begin{tabularx}{3.833cm}{x{1.54485 cm} x{1.88815 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{user and groups creations and modificaiton}}  \tn
% Row 0
\SetRowColor{LightBackground}
groupadd GROUP & creates new group \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
groupmod  -n NewGroupName & changes the group name \tn 
% Row Count 3 (+ 2)
% Row 2
\SetRowColor{LightBackground}
useradd USER & creates new user \tn 
% Row Count 4 (+ 1)
% Row 3
\SetRowColor{white}
useradd -d \seqsplit{/path/to/home/dir/} & creates a user with specified home directory \tn 
% Row Count 6 (+ 2)
% Row 4
\SetRowColor{LightBackground}
useradd -u USERID USER & allows to create user with personalized ID \tn 
% Row Count 8 (+ 2)
% Row 5
\SetRowColor{white}
useradd -G GROUP1, GROUP2... USER & allows to create user with multiples groups \tn 
% Row Count 10 (+ 2)
% Row 6
\SetRowColor{LightBackground}
cat /etc/passwd & lists all user and displays relevant information \tn 
% Row Count 13 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{x{1.51052 cm} x{1.92248 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{most used commands}}  \tn
% Row 0
\SetRowColor{LightBackground}
pwd & outputs the present working directory \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
sudo + other command(s) & allows to gain root privileges \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
root & access root user and its privileges \tn 
% Row Count 6 (+ 2)
% Row 3
\SetRowColor{white}
cd + specific address & access a specific address \tn 
% Row Count 8 (+ 2)
% Row 4
\SetRowColor{LightBackground}
cd & move to home directory \tn 
% Row Count 9 (+ 1)
% Row 5
\SetRowColor{white}
cd .. & go back to parent directory \tn 
% Row Count 11 (+ 2)
% Row 6
\SetRowColor{LightBackground}
ls & outputs information of present directory \tn 
% Row Count 13 (+ 2)
% Row 7
\SetRowColor{white}
ls + specific address & shows files in the specific directory \tn 
% Row Count 15 (+ 2)
% Row 8
\SetRowColor{LightBackground}
ls -a & option a allows to show hidden files \tn 
% Row Count 17 (+ 2)
% Row 9
\SetRowColor{white}
ls -l & show deeper description of showed files \tn 
% Row Count 19 (+ 2)
% Row 10
\SetRowColor{LightBackground}
ls -h & shows files in human readable format \tn 
% Row Count 21 (+ 2)
% Row 11
\SetRowColor{white}
touch "fileName" & creates file with the specified fileName \tn 
% Row Count 23 (+ 2)
% Row 12
\SetRowColor{LightBackground}
echo \textgreater{} "insert desired text" & allows to write text to a file(if any, erase old text in file) \tn 
% Row Count 26 (+ 3)
% Row 13
\SetRowColor{white}
echo \textgreater{}\textgreater{} "insert text here" & allows to append text to a file \tn 
% Row Count 28 (+ 2)
% Row 14
\SetRowColor{LightBackground}
cp "file" "directory" & copy files to new address \tn 
% Row Count 30 (+ 2)
\end{tabularx}
\par\addvspace{1.3em}

\vfill
\columnbreak
\begin{tabularx}{3.833cm}{x{1.51052 cm} x{1.92248 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{most used commands (cont)}}  \tn
% Row 15
\SetRowColor{LightBackground}
mv "file" "directory" & cut files to new address \tn 
% Row Count 2 (+ 2)
% Row 16
\SetRowColor{white}
mkdir "name" & creates a new directory inside the present directory \tn 
% Row Count 5 (+ 3)
% Row 17
\SetRowColor{LightBackground}
mkdir \seqsplit{/path/to/directory/"name"} & creates directory with a specific path \tn 
% Row Count 7 (+ 2)
% Row 18
\SetRowColor{white}
rm "file" & removes files from the system \tn 
% Row Count 9 (+ 2)
% Row 19
\SetRowColor{LightBackground}
rm -r "directory" & removes recursively the specified directory from the system \tn 
% Row Count 12 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{p{0.6866 cm} x{2.7464 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{service related commands}}  \tn
% Row 0
\SetRowColor{LightBackground}
\seqsplit{journalctl} & prompts the user with the active services in the system \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
\seqsplit{systemctl} & Control the systemd system and service manager \tn 
% Row Count 4 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{p{0.78959 cm} x{2.64341 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{commands miscellanea 2}}  \tn
% Row 0
\SetRowColor{LightBackground}
flock & manage locks from shell scripts \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
lockf & apply, test or remove a POSIX lock on an open file \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
fcntl & manipulate file descriptor \tn 
% Row Count 5 (+ 1)
% Row 3
\SetRowColor{white}
statd & NSM service daemon \tn 
% Row Count 6 (+ 1)
% Row 4
\SetRowColor{LightBackground}
stat & display file or file system status \tn 
% Row Count 8 (+ 2)
% Row 5
\SetRowColor{white}
samba & A Windows AD and SMB/CIFS fileserver for UNIX \tn 
% Row Count 10 (+ 2)
% Row 6
\SetRowColor{LightBackground}
\seqsplit{smbpasswd} & The Samba encrypted password file \tn 
% Row Count 12 (+ 2)
% Row 7
\SetRowColor{white}
sssd & System Security Services Daemon \tn 
% Row Count 14 (+ 2)
% Row 8
\SetRowColor{LightBackground}
setgid & set group identity \tn 
% Row Count 15 (+ 1)
% Row 9
\SetRowColor{white}
mktemp & create a temporary file or directory \tn 
% Row Count 17 (+ 2)
% Row 10
\SetRowColor{LightBackground}
true & do nothing, successfully \tn 
% Row Count 18 (+ 1)
% Row 11
\SetRowColor{white}
false & do nothing, unsuccessfully \tn 
% Row Count 19 (+ 1)
% Row 12
\SetRowColor{LightBackground}
if & "use" a Perl module if a condition holds \tn 
% Row Count 21 (+ 2)
% Row 13
\SetRowColor{white}
test & check file types and compare values \tn 
% Row Count 23 (+ 2)
% Row 14
\SetRowColor{LightBackground}
exit & self explanatory \tn 
% Row Count 24 (+ 1)
% Row 15
\SetRowColor{white}
w & displays who is logged in and what are they doing \tn 
% Row Count 26 (+ 2)
% Row 16
\SetRowColor{LightBackground}
fg & brings the most recent  background job to the foreground \tn 
% Row Count 28 (+ 2)
% Row 17
\SetRowColor{white}
sleep & delay for a specified amount of time \tn 
% Row Count 30 (+ 2)
\end{tabularx}
\par\addvspace{1.3em}

\vfill
\columnbreak
\begin{tabularx}{3.833cm}{p{0.78959 cm} x{2.64341 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{commands miscellanea 2 (cont)}}  \tn
% Row 18
\SetRowColor{LightBackground}
tac & concatenate and print files in reverse \tn 
% Row Count 2 (+ 2)
% Row 19
\SetRowColor{white}
wall & write a message to all users \tn 
% Row Count 3 (+ 1)
% Row 20
\SetRowColor{LightBackground}
whatis & display basic information about a command passed as parameter \tn 
% Row Count 6 (+ 3)
% Row 21
\SetRowColor{white}
yes "string" & infinitely outputs a string pass as parameter to the command \tn 
% Row Count 8 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}


% That's all folks
\end{multicols*}

\end{document}