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%\usepackage{opensans}          % Can't make this work so far. Shame. Would be lovely.
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% Document Info
\author{nhatlong0605}
\pdfinfo{
  /Title (lfcs-module2-userandgroupmanagement.pdf)
  /Creator (Cheatography)
  /Author (nhatlong0605)
  /Subject (LFCS\_Module2\_UserandGroupManagement Cheat Sheet)
}

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\begin{multicols}{3}
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    {\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{LFCS\_Module2\_UserandGroupManagement Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{nhatlong0605} via \textcolor{DarkBackground}{\uline{cheatography.com/68292/cs/17201/}}}
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\begin{multicols}{3}
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  \mymulticolumn{2}{p{5.377cm}}{\bf\textcolor{white}{Cheatographer}}  \\
  \vspace{-2pt}nhatlong0605 \\
  \uline{cheatography.com/nhatlong0605} \\
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  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Published 24th September, 2018.\\
   Updated 6th April, 2020.\\
   Page {\thepage} of \pageref{LastPage}.
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  %\includegraphics[width=48px,height=48px]{dave.jpeg}
  Measure your website readability!\\
  www.readability-score.com
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\begin{document}
\raggedright
\raggedcolumns

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% from this page to resize cheat sheet text:
% www.emerson.emory.edu/services/latex/latex_169.html
\footnotesize % Small font.

\begin{multicols*}{3}

\begin{tabularx}{5.377cm}{x{2.4885 cm} x{2.4885 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Creating Users, Groups}}  \tn
% Row 0
\SetRowColor{LightBackground}
useradd -s /bin/zsh -c 'my user' -m anna & Create user anna with default shell (-s) and home dir (-m) \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
id user & Show user info \tn 
% Row Count 4 (+ 1)
% Row 2
\SetRowColor{LightBackground}
groupadd sales & Create 'sales' group \tn 
% Row Count 5 (+ 1)
% Row 3
\SetRowColor{white}
usermod -aG sales anna & Add anna to supplementary group 'sales' \tn 
% Row Count 7 (+ 2)
% Row 4
\SetRowColor{LightBackground}
useradd -D & Display default value of user \tn 
% Row Count 9 (+ 2)
% Row 5
\SetRowColor{white}
\seqsplit{/etc/default/useradd} & Configuration file for default value \tn 
% Row Count 11 (+ 2)
% Row 6
\SetRowColor{LightBackground}
/etc/login.defs & Additional configuration value \tn 
% Row Count 13 (+ 2)
% Row 7
\SetRowColor{white}
/etc/skel & Content in skel will be copied to new user home dir \tn 
% Row Count 16 (+ 3)
% Row 8
\SetRowColor{LightBackground}
lid -g groupname & List all users that are members of a group \tn 
% Row Count 19 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{2.38896 cm} x{2.58804 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Resource Access Restrictions}}  \tn
% Row 0
\SetRowColor{LightBackground}
yum groups install 'Directory Client' & Install the Utility \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
yum install authconfig-gtk & Install graphic interface of auth \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
\seqsplit{/etc/security/limits}.conf & Limit configuration file:nproc, hard limit, soft limit \tn 
% Row Count 7 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{2.28942 cm} x{2.68758 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Access Control List}}  \tn
% Row 0
\SetRowColor{LightBackground}
setfacl -R -m d:g:sales:rx account & Set ACL so 'sales' group can read, execute on account dir and all sub-dir on default \tn 
% Row Count 4 (+ 4)
% Row 1
\SetRowColor{white}
getfacl & Display all access control list permissions (+ symbol) \tn 
% Row Count 7 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{System-Wide Environment Profile}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{env (environment variable) \newline export {\emph{var}} (store variable) \newline unset {\emph{var}} (reset variable) \newline env -i bash (change environment) \newline  \newline vim /etc/environment (set new variable) \newline LINUX="/home/long" \newline source /etc/environement (source new variable w/o reboot)} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Manage Template User Environment}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{vim /etc/skel/.bashrc (file for setting) \newline /etc/skel (putting new file here will make it default for new user only)} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{1.84149 cm} x{3.13551 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Permissions}}  \tn
% Row 0
\SetRowColor{LightBackground}
Read & 4, Read on File, Ls on Di \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
Write & 2, Modify on File, Create/Del on Dir \tn 
% Row Count 3 (+ 2)
% Row 2
\SetRowColor{LightBackground}
Execute & 1, Run on File, Cd into Dir \tn 
% Row Count 5 (+ 2)
% Row 3
\SetRowColor{white}
chgrp account account & Change group owner of account dir to 'account' group \tn 
% Row Count 8 (+ 3)
% Row 4
\SetRowColor{LightBackground}
chown anna account & Change anna to owner of 'account' dir \tn 
% Row Count 10 (+ 2)
% Row 5
\SetRowColor{white}
chown linda.sales sales & Change user and group owner of 'sales' dir to linda, sales \tn 
% Row Count 13 (+ 3)
% Row 6
\SetRowColor{LightBackground}
chmod g+w account & Make members of 'account' group have write permissions on account dir \tn 
% Row Count 16 (+ 3)
% Row 7
\SetRowColor{white}
chmod 770 sales & Make user, group have read, write, execute permission; others none \tn 
% Row Count 19 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{1.44333 cm} x{3.53367 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Extended Attributes}}  \tn
% Row 0
\SetRowColor{LightBackground}
chattr +i file1 & Make file1 has "immutable" attribute \tn 
% Row Count 2 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{2.4885 cm} x{2.4885 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Managing Quota on Ext4}}  \tn
% Row 0
\SetRowColor{LightBackground}
yum install -y quota & Install quota package \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
vim /etc/fstab & Config file for mounting file system automatically \tn 
% Row Count 5 (+ 3)
% Row 2
\SetRowColor{LightBackground}
mount -o remount /quota & Make sure the file system mounted with right options \tn 
% Row Count 8 (+ 3)
% Row 3
\SetRowColor{white}
quotacheck -mavug & Scan the file system \tn 
% Row Count 9 (+ 1)
% Row 4
\SetRowColor{LightBackground}
quota -vu lisa & Display quota on user lisa \tn 
% Row Count 11 (+ 2)
% Row 5
\SetRowColor{white}
quotaon -a & Activating quota \tn 
% Row Count 12 (+ 1)
% Row 6
\SetRowColor{LightBackground}
edquota -u lisa & Edit quota limit on user lisa; soft to 10; hard to 10 \tn 
% Row Count 15 (+ 3)
% Row 7
\SetRowColor{white}
edquota -b lisa linda & Copy the quota limit from lisa to linda \tn 
% Row Count 17 (+ 2)
% Row 8
\SetRowColor{LightBackground}
dd if=/dev/zero of=/quota/bigfile bs=1M count=3 & if input file; of output file; bs block size; write 3 times \tn 
% Row Count 20 (+ 3)
% Row 9
\SetRowColor{white}
repquota -aug & Display quota overview \tn 
% Row Count 22 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{2.33919 cm} x{2.63781 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Password Properties}}  \tn
% Row 0
\SetRowColor{LightBackground}
echo password | passwd -stdin brenda & Echo password to change brenda's password \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
chage brenda & Interactive change \tn 
% Row Count 3 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{1.4931 cm} x{3.4839 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{User,Group Configuration File}}  \tn
% Row 0
\SetRowColor{LightBackground}
cat /etc/group & Group config file \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
\seqsplit{sales:x:1004:anna} & \seqsplit{GroupName:Password:GroupID:GroupMembers} \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
cat /etc/passwd & User config file \tn 
% Row Count 6 (+ 2)
% Row 3
\SetRowColor{white}
cat /etc/shadow & User Config file \tn 
% Row Count 8 (+ 2)
% Row 4
\SetRowColor{LightBackground}
vipw -s & vi passwd consistently \tn 
% Row Count 9 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{1.44333 cm} x{3.53367 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Advanced Permissions}}  \tn
% Row 0
\SetRowColor{LightBackground}
suio & 4; run as owner on file \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
sgio & 2; run as group owner on file; inherit dir group owner \tn 
% Row Count 3 (+ 2)
% Row 2
\SetRowColor{LightBackground}
sticky & 1; delete only if owner on dir \tn 
% Row Count 5 (+ 2)
% Row 3
\SetRowColor{white}
chmod u+s playme & Set UserID bit on playme \tn 
% Row Count 7 (+ 2)
% Row 4
\SetRowColor{LightBackground}
chmod g+s * & Set GroupID bit on * \tn 
% Row Count 8 (+ 1)
% Row 5
\SetRowColor{white}
chmod +t * & Apply StickyBit, other users cannot delete file created by owner \tn 
% Row Count 11 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{2.33919 cm} x{2.63781 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Finding files w/ special permissions}}  \tn
% Row 0
\SetRowColor{LightBackground}
find -perm 0600 & Find file with read,write for users only \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
find / -perm /4000 -exec ls -l \{\} \textbackslash{}; & Find files in root dir with userID bit and list it \tn 
% Row Count 5 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}


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

\end{document}