How to display all existing regular file names from a text file?
Example:
$ cat file.txt
zzz
xxx/yyy
234 546
"abc def"
--bbb
$ cat file.txt | <one-liner>
zzz
xxx/yyy
 In this list from file.txt regular files zzz and xxx/yyy exist (for example). Hence, the <one-liner> displays zzz and xxx/yyy.
 What would be an implementation of this, preferably as a one-liner?
 I've quickly tried to play with something like xargs -I {} --max-lines=1 test -f "{}". However, it seems that it's not the right path.
 
                