Bash question

[Stewart C. Russell]

You could do something like:

ls *pdf | sed 's/_.*//;' | sort -u | while read prefix
do
  pdftk --outfile joined_${prefix}.pdf --infiles ${prefix}*pdf
done

This gives you loop over every unique prefix. I've assumed that every 
file starts with prefix+'_'. I know I have the arguments for pdftk 
wrong; it's slightly odd the way it's used. But I hope you get the idea.

cheers,
  Stewart
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