Search keyword in multiple PDF file

Search keyword “pattern” from all PDF file and list the frequency to a file.

find . -name “*.pdf” -exec sh -c ‘a=$(pdftotext -enc ASCII7 “{}” – | grep –with-filename –color “pattern” | wc -l); if [ $a != 0 ]; then echo “$a {}” >> pattern.txt; fi;’ \;

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