cat files with directory

Just as another idea, try tail -n +1 ./tmp/*.txt

==> file1.txt <==
<contents of file1.txt>

==> file2.txt <==
<contents of file2.txt>

==> file3.txt <==
<contents of file3.txt>

$ for file in ./tmp/*.txt; do echo "$file";  cat "$file"; done

-or-

$ find ./tmp -maxdepth 1 -name "*.txt" -print -exec cat "{}" \;

You could easily write a tiny script doing just that,

for f in "$@" do; echo "This is from $f"; cat -- "$f"; done