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‎course-linux-command-line-bash-scripting-metacentrum‎

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Subproject commit d952feac61388f192ba74759613cae9884da4b49

‎presentation/debian.png‎

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‎presentation/fedora.png‎

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‎presentation/linux_bash_metacentrum_course.38.vrb‎

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\frametitle{Extending permissions --- ACL}\framesubtitle {Access control list}
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\begin{itemize}
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\item By default, it is not possible to give specific permission to the user who is not owner, nor member of group owing the file
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\item In ext4 FS it has to be turned on manually (usually it is by default), it is part of XFS and Btrfs
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\item Command \texttt{getfacl} lists those extra permissions
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\item When in use, ``basic'' tools listing permissions (e.g. \texttt{ls -l}, ACL in use is marked by ``\texttt{+}'' on the beginning of the line) sometimes do not show correct result
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\item Command \texttt{setfacl} sets it
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\end{itemize}
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\begin{bashcode}
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getfacl FILE # get ACL for FILE
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setfacl -m u/g:USER/GROUP:r/w/x FILE # Add for USER/GROUP r/w/x right
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setfacl -R # Recursive
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setfacl -b # Remove all ACL
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\end{bashcode}

‎presentation/linux_bash_metacentrum_course.39.vrb‎

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\frametitle{Extending permissions --- ACL}\framesubtitle {Access control list}
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\begin{itemize}
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\item By default, it is not possible to give specific permission to the user who is not owner, nor member of group owing the file
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\item In ext4 FS it has to be turned on manually (usually it is by default), it is part of XFS and Btrfs
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\item Command \texttt{getfacl} lists those extra permissions
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\item When in use, ``basic'' tools listing permissions (e.g. \texttt{ls -l}, ACL in use is marked by ``\texttt{+}'' on the beginning of the line) sometimes do not show correct result
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\item Command \texttt{setfacl} sets it
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\end{itemize}
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\begin{bashcode}
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getfacl FILE # get ACL for FILE
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setfacl -m u/g:USER/GROUP:r/w/x FILE # Add for USER/GROUP r/w/x right
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setfacl -R # Recursive
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setfacl -b # Remove all ACL
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\end{bashcode}

‎presentation/linux_bash_metacentrum_course.40.vrb‎

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\frametitle{Extending permissions --- ACL}
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\begin{itemize}
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\item Access control list
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\item By default, it is not possible to give specific permission to the user who is not owner, nor member of group owing the file
5+
\item In ext4 FS it has to be turned on manually (usually it is by default), it is part of XFS and Btrfs
6+
\item Command \texttt{getfacl} lists those extra permissions
7+
\item When in use, ``basic'' tools listing permissions (e.g. \texttt{ls -l}, ACL in use is marked by ``\texttt{+}'' on the beginning of the line) sometimes do not show correct result
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\item Command \texttt{setfacl} sets it
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\end{itemize}
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\begin{bashcode}
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getfacl FILE # get ACL for FILE
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setfacl -m u/g:USER/GROUP:r/w/x FILE # Add for USER/GROUP r/w/x right
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setfacl -R # Recursive
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setfacl -b # Remove all ACL
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\end{bashcode}

‎presentation/linux_bash_metacentrum_course.56.vrb‎

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\frametitle{Links}
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\begin{itemize}
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\item Soft links --- like links on the web --- short-cut to another place: \texttt{ln -s source target}
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\begin{itemize}
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\item When we delete link, nothing happens, when target, non-working link remains
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\end{itemize}
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\end{itemize}
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\begin{bashcode}
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ls -l bin/cinema5
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lrwxrwxrwx 1 vojta users 42 5. dub 2014 cinema5 -> # "l" marks link
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/home/vojta/bin/cinema5-0.2.1-beta/cinema5* # "->" points to target
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\end{bashcode}
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\begin{itemize}
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\item Hard links --- only second name for file already presented on the disk (available only for files): \texttt{ln source target}
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\end{itemize}
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\begin{bashcode}
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ln .bashrc .bashrcX
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ls -l .bash* # Numbers in first column show links pointing to it
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# For directories - number of items, for files = 1
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-rw------- 1 vojta users 27298 21. led 16.43 .bash_history # One link
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-rw-r--r-- 2 vojta users 2707 29. lis 16.21 .bashrc # Same data as below
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-rw-r--r-- 2 vojta users 2707 29. lis 16.21 .bashrcX # Two links
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\end{bashcode}

‎presentation/linux_bash_metacentrum_course.57.vrb‎

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\frametitle{Links}
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\begin{itemize}
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\item Soft links --- like links on the web --- short-cut to another place: \texttt{ln -s source target}
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\begin{itemize}
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\item When we delete link, nothing happens, when target, non-working link remains
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\end{itemize}
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\end{itemize}
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\begin{bashcode}
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ls -l bin/cinema5
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lrwxrwxrwx 1 vojta users 42 5. dub 2014 cinema5 -> # "l" marks link
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/home/vojta/bin/cinema5-0.2.1-beta/cinema5* # "->" points to target
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\end{bashcode}
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\begin{itemize}
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\item Hard links --- only second name for file already presented on the disk (available only for files): \texttt{ln source target}
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\end{itemize}
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\begin{bashcode}
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ln .bashrc .bashrcX
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ls -l .bash* # Numbers in first column show links pointing to it
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# For directories - number of items, for files = 1
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-rw------- 1 vojta users 27298 21. led 16.43 .bash_history # One link
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-rw-r--r-- 2 vojta users 2707 29. lis 16.21 .bashrc # Same data as below
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-rw-r--r-- 2 vojta users 2707 29. lis 16.21 .bashrcX # Two links
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\end{bashcode}

‎presentation/linux_bash_metacentrum_course.58.vrb‎

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\frametitle{Links}
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\begin{itemize}
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\item Soft links --- like links on the web --- short-cut to another place: \texttt{ln -s source target}
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\begin{itemize}
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\item When we delete link, nothing happens, when target, non-working link remains
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\end{itemize}
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\end{itemize}
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\begin{bashcode}
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ls -l bin/cinema5
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lrwxrwxrwx 1 vojta users 42 5. dub 2014 cinema5 -> # "l" marks link
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/home/vojta/bin/cinema5-0.2.1-beta/cinema5* # "->" points to target
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\end{bashcode}
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\begin{itemize}
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\item Hard links --- only second name for file already presented on the disk (available only for files): \texttt{ln source target}
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\end{itemize}
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\begin{bashcode}
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ln .bashrc .bashrcX
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ls -l .bash* # Numbers in first column show links pointing to it
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# For directories - number of items, for files = 1
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-rw------- 1 vojta users 27298 21. led 16.43 .bash_history # One link
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-rw-r--r-- 2 vojta users 2707 29. lis 16.21 .bashrc # Same data as below
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-rw-r--r-- 2 vojta users 2707 29. lis 16.21 .bashrcX # Two links
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\end{bashcode}

‎presentation/linux_bash_metacentrum_course.62.vrb‎

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\frametitle{Redirects and pipes}
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\begin{bashcode}
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# Add error output to the end of standard output file
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command >> outputfile 2>&1
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# Add error output to the error log text file
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command >> outputfile 2>error.log
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\end{bashcode}
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\begin{itemize}
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\item /dev/null --- ``black hole'' --- discards everything (don't care about errors?): \texttt{command 2\textgreater~/dev/null}
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\item /dev/stdin --- standard input (in case application reads files, not from standard input): \texttt{echo "Žluťoučký kůň" | iconv -f utf-8 -t cp1250 /dev/stdin}
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\item /dev/stdout --- standard output (we wish to see errors which would be discarded otherwise): \texttt{command 2\textgreater~/dev/stdout}
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\item /dev/stderr --- standard error output (right place to send errors to): \texttt{echo "error" > /dev/stderr}
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\end{itemize}

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