grep & sed

sed.sh

# find non UTF8 encoded files
find . -type 'f' -exec file {} \; | grep 'ASCII'    

# find
grep -rnw 'app/views/bids' -e "pandoc"   

# fix
find '20' -type f -exec gsed -i.bak "s/test/\/media\/Telecom Italia/g" {} \; 
find '21' -type f -exec gsed -i.bak "s/Telecom Italia (AWS)\/pandoc-output\/media/\/media\/Telecom Italia (AWS)/g" {} \; 
find 'app/views/bids/8' -type f -exec gsed -i.bak "s/Dom-Daniel \/media\/LLC/\/media\/Dom-Daniel LLC/g" {} \; 

# rename uppercase to lowercase file extension
find . -name '*.*' -exec sh -c 'a=$(echo "$0" | gsed -r "s/([^.]*)\$/\L\1/");  [ "$a" != "$0" ] && mv "$0" "$a" ' {} \;

# Check for file references and see if filex actually exists
grep -ro 'app/views/bids/' -e  "(\/media.*)" | sed 's/\/media/public\/media/g' | sed 's/.*://g' | sed 's/[()]//g' | xargs find   
# Check for file references and see if filex actually exists #2
grep -ro 'app/views/bids/' -e  "(\/media.*)" | sed 's/\/media/public\/media/g' | sed 's/.*://g' | sed 's/^(//g' | sed 's/)$//g' | while read f; do file "$f"; done | grep "cannot open" > 404s.txt

# Find files with names _23 - _34 and create backup
find 'app/views/bids' -type f -name "_2[3-9]*" -o -name "_3[0-9]*" | xargs tar rvf bids_not_yet_needed.tar 

# Remove files with names _23 - _34
find 'app/views/bids' -type f -name "_2[3-9]*" -delete -o -name "_3[0-9]*" -delete

Brackets mean "any one of".