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sed uses POSIX 1003.2 regular expressions, when invoked with the -r option.
-r : use extended regular expressions -i : edit (I)n-place
change spelling error in all tex files:
$ for f in *.tex;do (sed -e "s/rythm/rhythm/g" <$f >$f.sed);mv $f.sed $f;done
funky: replace all "\begin{}" og "\end{}" with "\svin<>" og "\ko<>":
$ sed -e 's/\\begin{\([a-z_]*\)}/\\svin<\1>/' -e 's/\\end{\([a-z_]\)}/\\ko<\1>/' svin.tex
fix the tendency of EMacs-users to put "\begin{document}" a.o. in all of their .tex-files:
$ sed -e 's/^\\(begin\|end\){document}/% \\1{document}/g' -e 's/\input{preamble}/% \input{preamble}/g' *.tex
convert latex -> plain text:
$ sed -e 's/\$//g' -e 's/\\[a-zA-Z]*//g' -e 's/{[a-z_]*}//g' -e 's/ \+/ /g' -e 's/ ,/,/g' idiot.tex
convert LaTeX bibliography file to \cites:
$ sed -e '/^[@].*/!d' -e 's/@[[:alpha:]]*{\([[:alnum:]_]*\),/\\cite{\1}/g' bibliography.bib
" -e '/^[@].*/!d' ": means: remove all lines that does NOT begin with a '@'
the rest means: replace all "@<name>{<#1>," with \cite{<#1>}