practicum.tex

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\title{\textbf{Not Sucking in the UNIX Environment}}
\date{}
\author{CS4803UWS at the\\
Georgia Institute of Technology
}

\begin{document}

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\colorbox{black}{\textbf{not sucking in the unix environment}}
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\hfill \scriptsize{copyright \copyright\ 2013}\\
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\begin{frame}
\huge{SCRIPTING}
\end{frame}

\begin{frame}{Bash grammar\footnote{\tiny{This does not conform to {\tt bash(1)} as of 4.2; I believe the official grammar to be inaccurate.}}}
\tiny{
\begin{description}
\item[\textbf{compound::=}] {\tt(}<list>{\tt)} | {\tt\{}<list>{\tt;\}} | {\tt((}<arithexpr>{\tt))} | {\tt[[}<condexpr>{\tt]]} |\\
 {\tt for} <name> [{\tt in} <word> \ldots {\tt;}] {\tt do} <list> {\tt; done} |\\
 {\tt for ((} <expr> {\tt;} <expr> {\tt;} <expr> {\tt)) ;} {\tt do} <list> {\tt; done} |\\
 {\tt select} <name> [{\tt in} <word>] {\tt; do} <list> {\tt; done} |\\
 {\tt case} <word> {\tt in} [[{\tt(}<pattern> [| <pattern>\ldots]{\tt)}] <list> {\tt;;}] \ldots {\tt esac} |\\
 {\tt if} <list> {\tt; then} <list> {\tt;} [{\tt elif} <list> {\tt; then} <list> {\tt;}] \ldots [{\tt else} <list> {\tt;}] {\tt fi} |\\
 {\tt while} <list> \textbf{FIXME} |\\
 {\tt until} <list> \textbf{FIXME}
\item[\textbf{function::=}]\ <name> () <compound> [<redirection>] | \\
 {\tt function} name [{\tt ()}] <compound> [<redirection>]
\item[\textbf{coproc::=}] {\tt coproc} <name> 
\item[\textbf{list::=}]\ <pipeline> [{\tt;} | {\tt\&} | {\tt\&\&} | {\tt||} <pipeline> \ldots] [{\tt;} | {\tt\&}]
\item[\textbf{pipeline::=}] [{\tt time} [{\tt -p}]] [{\tt!}] <command> [{\tt|} | {\tt|\&} <command> \ldots]
\item[\textbf{arithexpr::=}]
\item[\textbf{condexpr::=}]
\item[\textbf{command::=}]
\end{description}
}
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\begin{frame}{Shell scripts}
\begin{itemize}
\item POSIX conformance: probably not worth it
\item First line: \texttt{\#!/bin/sh} or \texttt{/usr/bin/env} \textit{shell}
\item Second line: \texttt{set -e || exit 1}
\item Pipelines only fail if the last command fails\footnote{Unless \texttt{-o pipefail} (bash-only) is used.}
\item Catch subshell errors via assignment
\item \texttt{trap} on signals and pseudo-signal 0\footnote{bash allows \texttt{trap}ping EXIT as a synonym for 0.}
\end{itemize}
\end{frame}

\begin{frame}{Redirection}
\begin{itemize}
\item Pipe creation occurs prior to redirection
\item Redirect to stderr: \texttt{>\&2}
\item Functions can be redirected at definition, \textit{and} at invocation
\item Pipes can't target functions (use \texttt{read} if you must)
\item Redirect both stdout and stderr: \texttt{>} \textit{redir} \texttt{2>\&1}
\item Send stderr to stdin through pipe: \texttt{|\&} (\texttt{2>\&1 |})
\item Duplicate to stdout and a file: \texttt{| tee} \textit{file}
\item Append: \texttt{>}\texttt{>}\textit{file}
\item Dup and append: \texttt{| tee -a} \textit{file}
\item \texttt{/dev/std\{in, out, err\}}: stdio in a filename context
\end{itemize}
\end{frame}

\begin{frame}{Perl}
Please don't write perl.
\end{frame}

\begin{frame}{FIXME}
\huge FIXME approximately 5 more pages...
\end{frame}

\begin{frame}
\huge{C/C++}
\end{frame}

\begin{frame}{GNU Autotools in one terrible diagram}
\includegraphics[scale=0.45]{images/circleoflife.png}
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\begin{frame}{FIXME}
\huge FIXME approximately 10 more pages...
\end{frame}

\begin{frame}{Recommended reading}
\begin{itemize}
\small{
\item Dennis Ritchie. ``Evolution of the Unix Time-sharing System'' (1979).
\item Neil Brown. ``Ghosts of UNIX Past'' LWN, in four parts (2004).
\item Tom Christiansen. ``\texttt{csh} Programming Considered Harmful'' (1995).
\item Mendel Cooper. ``Advanced Bash-Scripting Guide'' (2012).
\item Peter Krumins. ``\texttt{sed} One-Liners Explained'' (2008).
\item Peter Krumins. ``\texttt{awk} One-Liners Explained'' (2008).
\item Steve Yegge. ``Ancient Languages: Perl'' (2004-12-04).
\item ``Implementing a Job Control Shell'' GNU libc Info pages.
\item Neal Stephenson. \textit{In the Beginning was the Command Line} (1999).
}
\end{itemize}
\end{frame}

\begin{frame}{Hack on!}
``One of the main causes of the fall of the Roman Empire was that, lacking zero, they had no way to indicate successful termination of their C programs.''\hfill---Robert Firth
\vfill
``It's easier to port a shell than a shell script.''\hfill---Larry Wall
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\end{document}