CODEWITHSUNDEEP
sed
exl
exl

Reputation: 1853

using sed to rename files based on contents in OSX

I'm using OSX, and I'm trying to take a piece of text within a .Rnw file, and then rename that file.

The file (text file) looks like this:

\begin{question}


A business incurs the following costs per unit: Labor  \$125/unit; Materials \$45/unit and rent  \$250,000/month. If the firm produces 1,000,000 units a month, the total variable costs equal
\begin{answerlist} 
\item \$125Million

\item \$45Million

\item \$1Million

\item \$170Million


\end{answerlist}
\end{question}

\begin{solution}
\begin{answerlist}
\item F. 
\item F. 
\item F. 
\item F. 
\end{answerlist}
\end{solution}

\exname{target}
\extype{schoice}
\exsolution{0001}
\exshuffle{TRUE}

I want to grab the text in the \exname{} field, and make it the new title of the file. So, I want the file here to contain the contents as posted, and the whole file should be named "target.Rnw".

The link below got me started, but I can't make it work, such that the script takes the base file, then renames it based on that which is in the \exname{} field.

https://unix.stackexchange.com/questions/158447/grep-search-expression-and-rename-file

Upvotes: 0

Views: 67

Answers (1)

Sundeep
Sundeep

Reputation: 23677

See if this works:

$ cat ip.Rnw
\end{solution}

\exname{target}
\extype{schoice}
\exsolution{0001}
\exshuffle{TRUE}

$ # use { or } as delimiters
$ # print second field if first field is \exname
$ awk -F'[{}]' '$1=="\\exname"{print $2}' ip.Rnw
target

$ # with sed, use capture group and backreference
$ sed -n 's/^\\exname{\(.*\)}/\1/p' ip.Rnw 
target

$ # echo is for testing purpose, remove it once things seem fine
$ echo mv ip.Rnw "$(awk -F'[{}]' '$1=="\\exname"{print $2 ".Rnw"}' ip.Rnw)"
mv ip.Rnw target.Rnw

Upvotes: 2

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