Recursive ls with conditions

Why can't I use a command like this to find all the pdf files in a directory and subdirectories?

The wildcard *.pdf in your command is expanded by bash to all matching files in the current directory, before executing ls.

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How do I do it? (I'm using bash in ubuntu)

find is your answer.

find . -name \*.pdf

is recursive listing of pdf files. -iname is case insensitive match, so

find . -iname \*.pdf

lists all .pdf files, including for example foo.PDF

Also, you can use ls for limited number of subfolders, for example

ls *.pdf */*.pdf

to find all pdf files in subfolders (matches to bar/foo.pdf, not to bar/foo/asdf.pdf, and not to foo.PDF).

If you want to remove files found with find, you can use

find . -iname \*.pdf -delete

Use find instead of ls

find . -name '*.pdf'

As others have said, find is the answer.

Now to answer the other part.

• How would I then go about deleting all these files?

  find . -iname *.pdf -exec rm {} \;

Should do it.