Comment by arp242

For zsh I use this to setup $PATH, which seems to address most of the use cases of this tool:

  ### Setup PATH
  dirs=(
      /usr/lib/ccache/bin                   # ccache
      ~/.local/script ~/.local/bin          # My local scripts.
      ~/.local/gobin                        # GOBIN
      /usr/local/bin /usr/local/sbin        # local takes precedence
      /bin /sbin /usr/bin /usr/sbin         # Standard Unix
      /usr/pkg/bin   /usr/pkg/sbin          # NetBSD
      /usr/X11R6/bin /usr/X11R6/sbin        # OpenBSD
      /opt/ooce/bin                         # illumos
      ~/.local/share/gem/ruby/*/bin(N[-1])  # Ruby
      ~/.luarocks/bin(N[-1])                # Lua
      ~/.local/dotnet/root ~/.local/dotnet/tools  # .NET
      /usr/lib/plan9/bin                    # Plan 9 from userspace
      ~/code/Vim/gopher.vim/tools/bin       # gopher.vim
      ~/.nimble/bin                         # Nim
      ~/.cargo/bin                          # Rust
      ~/.ghcup/bin                          # Haskell
  )
  typeset -U path=()                        # No duplicates
  # Use full path so /bin and /usr/bin aren't duplicated if it's a symlink.
  for d in $dirs:A; [[ -d $d ]] && path+=($d)
  unset dirs d

typeset -U makes the $path array "unique", and :A ensures the full path is always used (in case of symlinks).

You can probably do something similar with bash, but idk.

$path is tied to $PATH and an array, so you can use it as such for some of the other things:

  print ${(F)path} | grep /bin  # (F) to print one array per line
  print ${(F)path} | sort       # can also use (o) to print ordered