fp

fp (FilterPath) is the filter equivalent for the Unix test util.

Quick start

$ ls
file-foo dir-read-write dir-read-only

# list files in the current directory, and filter for writable directories
$ ls | fp -dw
dir-read-write

For help, run fp with -? or --help.

The accepted filter flags are the same ones used by Unix test. See POSIX documentation or man test.