> To add file extensions, you’ll need to run the following find command. > It will change the names of ALL files within the current directory by appending .csv

> To add file extensions, you’ll need to run the following find command. > It will change the names of ALL files within the current directory by appending .csv, so be careful. > find . -type f -exec mv '{}' '{}'.csv \; Could use instead: find . -name 'new_filname*' -exec mv '{}' '{}'.csv \; Although simpler would be using: split -l 500 filename.csv --additional-suffix=.cvs Also the suffix supplied to sed's in-place is optional sed -i '' 's/\$//g' data.txt sed -i 's/\$//g' data.txt # same as above