This is the
mv command I use to change all of the filenames in my current directory from mixed case to lowercase and replace spaces with underscores.
for file in *; do mv "$file" `echo $file | tr ' ' '_' | tr '[:upper:]' '[:lower:]'` ; done
; semicolons indicate the end of each line of this command. To break it down:
for file in *loops over all the files in the directory. You could change the
*wildcard to something like
*.jpgif you wanted to only target JPG files.
do mv "$file"instructs the system to move each file in the loop to the location that immediately follows.
`echo $file | tr ' ' '_' | tr '[:upper:]' '[:lower:]'`is the location we’re moving the file to. We use the
tr“translate” command to replace spaces with underscores, and then again (separated by the
|pipe character) to replace uppercase letters with lowercase letters. Then we
echothat translated filename.
donelets the system know that the loop is done.
I use this occasionally to prep files for use on the web when working on a static site, one that isn’t hooked it up to a CMS.