diff --git a/TODO b/TODO
index 14ce516..7b69e0a 100644
--- a/TODO
+++ b/TODO
@@ -1,11 +1,57 @@
 - refactor the elevation detection stuff. I'm not terribly happy with it.
 
-- password generator utility/library
+- add generic password prompt func that takes in a `prompt []byte` param and returns `(passwd []byte, err error)`
+```
+func getPasswd(prompt []byte) (passwd []byte, err error) {
+
+        var b []byte
+        var newLnd bool
+        var origIn *term.State
+        var origOut *term.State
+        var fdIn int = int(os.Stdin.Fd())
+        var fdOut int = int(os.Stdout.Fd())
+
+        if origIn, err = term.GetState(fdIn); err != nil {
+                return
+        }
+        if origOut, err = term.GetState(fdOut); err != nil {
+                return
+        }
+        defer func() {
+                var tErr error
+
+                if !newLnd {
+                        fmt.Println()
+                }
+
+                if tErr = term.Restore(fdIn, origIn); tErr != nil {
+			return
+                }
+                if tErr = term.Restore(fdOut, origOut); tErr != nil {
+			return
+                }
+        }()
+
+	os.Stdout.Write(prompt)
+        if b, err = term.ReadPassword(fdIn); err != nil {
+                return
+        }
+        passwd = b
+        fmt.Println()
+        newLnd = true
+
+        return
+}
+```
+
+
+- password generator/hash+salter and "checksum/hash guesser" utility/library
 -- incorporate with r00t2.io/pwgen
 -- incorporate with https://github.com/tredoe/osutil ?
 -- cli flag to dump flat hashes too (https://github.com/hlandau/passlib and others soon in pwgen)
 
 - auger needs to be build-constrained to linux.
+-- (i think i fixed this)
 
 - unit tests
 
diff --git a/envs/.osenvs.WIP/TODO b/envs/.osenvs.WIP/TODO
deleted file mode 100644
index 4c131fb..0000000
--- a/envs/.osenvs.WIP/TODO
+++ /dev/null
@@ -1,30 +0,0 @@
-macOS:
-HOME
-LOGNAME
-OLDPWD
-PATH
-PWD
-SHELL
-SHLVL
-SSH_CLIENT
-SSH_CONNECTION
-SSH_TTY
-TERM
-TMPDIR
-USER
-_
-e.g.
-HOME=/Users/bts
-LOGNAME=bts
-OLDPWD=/Users/bts
-PATH=/usr/local/bin:/System/Cryptexes/App/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/local/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/appleinternal/bin
-PWD=/Users/bts
-SHELL=/bin/zsh
-SHLVL=1
-SSH_CLIENT=192.168.2.99 39690 22
-SSH_CONNECTION=192.168.2.99 39690 192.168.2.148 22
-SSH_TTY=/dev/ttys000
-TERM=xterm-256color
-TMPDIR=/var/folders/qv/bm6dlyd94x5fs6qpkfpj0jsr0000gq/T/
-USER=bts
-_=/usr/bin/env
diff --git a/envs/TODO b/envs/TODO
new file mode 100644
index 0000000..6563fe7
--- /dev/null
+++ b/envs/TODO
@@ -0,0 +1,78 @@
+- func and struct to return segregated system-level env vars vs. user env vars (mostly usable on windows) (see .TODO.go.UNFINISHED and ITERATION/EXPECTED DEFAULTS below)
+
+- - for envs, provide helpers: UsernmEnv and PasswdEnv
+-- each takes an argument, envVar, that specifies an env var name to lookup via envs.HasEnv.
+-- returns (val string, ok bool, err error)
+-- for PasswdEnv:
+--- param `ask bool`; if envVar doesn't exist and `ask` is true, prompt user for password (https://pkg.go.dev/golang.org/x/term#ReadPassword)
+--- param `prompt []byte`; if empty, use generic "enter password (will not echo back)", otherwise use `prompt` as prompt (only prompted if `ask` == true)
+--- param `confirm bool`; if true, prompt for user confirmation
+-- for UsernmEnv:
+--- param `ask int`;
+      if > 0, always prompt user (using `prompt`) if EnvVar doesn't exist.
+      if == 0, use current username if `current == true` and prompt for confirmation/override (if `current == false`, always prompt).
+      if < 0, never prompt and fallback to current username if `current == true`, return empty/not ok if `current == false`.
+--- param `current bool`; if envVar doesn't exist and `current` is true,
+--- param `prompt []byte`; if empty, use generic "enter username" (use fmt.Scanln), otherwise use `prompt` as prompt (only prompted if `ask` >= 0)
+
+
+#################################
+## ITERATION/EXPECTED DEFAULTS ##
+#################################
+macOS:
+HOME
+LOGNAME
+OLDPWD
+PATH
+PWD
+SHELL
+SHLVL
+SSH_CLIENT
+SSH_CONNECTION
+SSH_TTY
+TERM
+TMPDIR
+USER
+_
+e.g.
+HOME=/Users/bts
+LOGNAME=bts
+OLDPWD=/Users/bts
+PATH=/usr/local/bin:/System/Cryptexes/App/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/local/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/appleinternal/bin
+PWD=/Users/bts
+SHELL=/bin/zsh
+SHLVL=1
+SSH_CLIENT=192.168.2.99 39690 22
+SSH_CONNECTION=192.168.2.99 39690 192.168.2.148 22
+SSH_TTY=/dev/ttys000
+TERM=xterm-256color
+TMPDIR=/var/folders/qv/bm6dlyd94x5fs6qpkfpj0jsr0000gq/T/
+USER=bts
+_=/usr/bin/env
+
+
+
+Windows:
+https://github.com/MicrosoftDocs/win32/blob/docs/desktop-src/shell/csidl.md
+https://learn.microsoft.com/en-us/windows/deployment/usmt/usmt-recognized-environment-variables
+https://learn.microsoft.com/en-us/windows/win32/procthread/environment-variables
+https://cdn.callback.com/help/CXH/RefDoc/html/T_callback_ShellBoost_Core_WindowsShell_CSIDL.htm
+https://ss64.com/ps/syntax-env.html
+https://ss64.com/nt/syntax-variables.html
+
+Linux:
+https://specifications.freedesktop.org/basedir/latest/
+https://ss64.com/bash/syntax-variables.html
+environ(7)?
+Might need to do an LFS install and run `env` there.
+get list of standard envs in addn to POSIX (see below)
+
+macOS + Linux:
+https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap08.html
+https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/V1_chap08.html
+enumerate default bash and zsh env vars on each, and switch on $SHELL.
+
+macOS:
+https://developer.apple.com/documentation/xcode/environment-variable-reference (XCode only?)
+https://ss64.com/mac/syntax-variables.html
+needs `env` in clean environment
diff --git a/envs/funcs.go b/envs/funcs.go
index eda66c1..ee7341a 100644
--- a/envs/funcs.go
+++ b/envs/funcs.go
@@ -332,6 +332,30 @@ func InterpolateString(s *string) (err error) {
 	return
 }
 
+// MustEnv wraps [GetEnvErr], but will panic on non-nil err.
+func MustEnv(key string) (value string) {
+
+	var err error
+
+	if value, err = GetEnvErr(key); err != nil {
+		panic(err)
+	}
+
+	return
+}
+
+// MustEnvNoBlank wraps [GetEnvErrNoBlank], but will panic on non-nil err.
+func MustEnvNoBlank(key string, ignoreWhitespace bool) (value string) {
+
+	var err error
+
+	if value, err = GetEnvErrNoBlank(key, ignoreWhitespace); err != nil {
+		panic(err)
+	}
+
+	return
+}
+
 // interpolateMap is used by [Interpolate] for maps. v should be a [reflect.Value] of a map.
 func interpolateMap(v reflect.Value) (err error) {
 
diff --git a/gfxres/TODO b/gfxres/TODO
new file mode 100644
index 0000000..8dece35
--- /dev/null
+++ b/gfxres/TODO
@@ -0,0 +1,17 @@
+- clean up from PoC into unit tests and exported functions/constants etc.
+- "Class" and "String" methods for each of the standard named resolutions
+
+refs:
+https://en.wikipedia.org/wiki/Display_resolution
+https://en.wikipedia.org/wiki/Display_aspect_ratio
+https://en.wikipedia.org/wiki/Display_resolution_standards
+https://en.wikipedia.org/wiki/Video_Graphics_Array
+https://en.wikipedia.org/wiki/Extended_Graphics_Array
+https://en.wikipedia.org/wiki/Super_VGA
+https://en.wikipedia.org/wiki/Digital_Cinema_Package
+https://www.lenovo.com/us/en/glossary/what-is-sxga/
+https://www.corsair.com/us/en/explorer/gamer/monitors/wuxga-resolution-explained/
+https://www.lenovo.com/us/en/glossary/wqxga/
+https://www.strong-eu.com/blog/hd-fhd-uhd-4k-what-are-the-differences
+https://www.unravel.com.au/aspect-ratio-cheat-sheet
+https://www.wearethefirehouse.com/aspect-ratio-cheat-sheet
diff --git a/gfxres/main.go b/gfxres/main.go
new file mode 100644
index 0000000..31a5589
--- /dev/null
+++ b/gfxres/main.go
@@ -0,0 +1,652 @@
+package main
+
+import (
+	"fmt"
+	`math`
+	`slices`
+	"strconv"
+	`strings`
+
+	mapset `github.com/deckarep/golang-set/v2`
+)
+
+type (
+	AspectRatio struct {
+		ar    float64
+		arStr string
+		arW   float64
+		arH   float64
+		gcd   int
+		res   *Resolution
+	}
+	Resolution struct {
+		w  int
+		h  int
+		ar *AspectRatio
+	}
+)
+
+func (a *AspectRatio) AsFloat() (ar float64) {
+
+	if a == nil {
+		return
+	}
+
+	if a.ar == 0 {
+		a.ar = float64(a.res.w) / float64(a.res.h)
+	}
+
+	ar = a.ar
+
+	return
+}
+
+func (a *AspectRatio) AsSlice() (ar [2]float64) {
+
+	if a.arW == 0 {
+		a.arW = float64(a.res.w) / float64(a.GCD())
+	}
+	if a.arH == 0 {
+		a.arH = float64(a.res.h) / float64(a.GCD())
+	}
+
+	ar = [2]float64{
+		a.arW,
+		a.arH,
+	}
+
+	return
+}
+
+/*
+Cmp is a comparison function that can be used for sorting.
+
+The return cmp value has the same meaning as in [slices.SortFunc]:
+
+If a comes before other, cmp == -1
+If a comes after other, cmp == 1
+If a and other are equal, cmp == 0
+*/
+func (a *AspectRatio) Cmp(other AspectRatio) (cmp int) {
+
+	var aSlice [2]float64
+	var oSlice [2]float64
+
+	if a == nil {
+		return
+	}
+
+	aSlice = a.AsSlice()
+	oSlice = other.AsSlice()
+
+	if aSlice[0] == oSlice[0] && aSlice[1] == oSlice[1] {
+		return
+	}
+	if aSlice[0] == oSlice[0] {
+		if aSlice[1] < oSlice[1] {
+			cmp = -1
+		} else {
+			cmp = 1
+		}
+	} else {
+		if aSlice[0] < oSlice[0] {
+			cmp = -1
+		} else {
+			cmp = 1
+		}
+	}
+
+	return
+}
+
+func (a *AspectRatio) Equals(other AspectRatio) (isEqual bool) {
+
+	isEqual = a.Cmp(other) == 0
+
+	return
+}
+
+func (a *AspectRatio) FloatString() (s string) {
+
+	if a == nil {
+		return
+	}
+
+	if a.ar == 0 {
+		a.ar = float64(a.res.w) / float64(a.res.h)
+	}
+
+	s = strconv.FormatFloat(a.ar, 'f', -1, 64)
+
+	return
+}
+
+func (a *AspectRatio) GCD() (gcd int) {
+
+	var x int
+	var y int
+
+	if a == nil {
+		return
+	}
+
+	if a.gcd == 0 {
+		x = a.res.w
+		y = a.res.h
+		// Euclidean GCD ("Greatest Common Divisor") algorithm
+		for y != 0 {
+			x, y = y, x%y
+		}
+		a.gcd = x
+	}
+
+	gcd = a.gcd
+
+	return
+}
+
+func (a *AspectRatio) Resolution() (r Resolution) {
+
+	var ar [2]float64
+	var resInts [2]int
+
+	if a == nil {
+		return
+	}
+
+	resInts = a.res.AsSlice()
+	ar = a.AsSlice()
+
+	// Return a fully populated copy.
+	r = Resolution{
+		w: resInts[0],
+		h: resInts[1],
+	}
+	r.ar = &AspectRatio{
+		ar:    a.AsFloat(),
+		arStr: a.String(),
+		arW:   ar[0],
+		arH:   ar[1],
+		gcd:   a.GCD(),
+		res:   &r,
+	}
+
+	return
+}
+
+func (a *AspectRatio) String() (s string) {
+
+	if a == nil {
+		return
+	}
+
+	if a.arStr == "" {
+		if a.arW == 0 {
+			a.arW = float64(a.res.w) / float64(a.GCD())
+		}
+		if a.arH == 0 {
+			a.arH = float64(a.res.h) / float64(a.GCD())
+		}
+		a.arStr = fmt.Sprintf(
+			"%d:%d",
+			int(math.Round(a.arW)),
+			int(math.Round(a.arH)),
+		)
+	}
+
+	s = a.arStr
+
+	return
+}
+
+func (r *Resolution) AsSlice() (res [2]int) {
+
+	res = [2]int{r.w, r.h}
+
+	return
+}
+
+func (r *Resolution) AspectRatio() (ar AspectRatio) {
+
+	if r == nil {
+		return
+	}
+
+	if r.ar == nil {
+		r.ar = NewAspectRatio("", r.w, r.h)
+	}
+
+	ar = AspectRatio{
+		ar:    r.ar.AsFloat(),
+		arStr: r.ar.String(),
+		arW:   r.ar.arW,
+		arH:   r.ar.arH,
+		gcd:   r.ar.GCD(),
+		res: &Resolution{
+			w: r.w,
+			h: r.h,
+		},
+	}
+	ar.res.ar = &ar
+
+	return
+}
+
+/*
+Cmp is a comparison function that can be used for sorting.
+
+The return cmp value has the same meaning as in [slices.SortFunc]:
+
+If r comes before other, cmp == -1
+If r comes after other, cmp == 1
+If r and other are equal, cmp == 0
+*/
+func (r *Resolution) Cmp(other Resolution) (cmp int) {
+
+	if r == nil {
+		return
+	}
+	if r.w == other.w && r.h == other.h {
+		return
+	}
+	if r.w == other.w {
+		if r.h < other.h {
+			cmp = -1
+		} else {
+			cmp = 1
+		}
+	} else {
+		if r.w < other.w {
+			cmp = -1
+		} else {
+			cmp = 1
+		}
+	}
+
+	return
+}
+
+func (r *Resolution) Equals(other Resolution) (isEqual bool) {
+
+	isEqual = r.Cmp(other) == 0
+
+	return
+}
+
+func (r *Resolution) Inverted() (i *Resolution) {
+
+	i = &Resolution{
+		w: r.h,
+		h: r.w,
+	}
+	i.ar = &AspectRatio{
+		res: i,
+	}
+
+	return
+}
+
+func (r *Resolution) String() (s string) {
+
+	s = fmt.Sprintf("%dx%d", r.w, r.h)
+
+	return
+}
+
+var (
+	resolutions [][2]int = [][2]int{
+
+		/*
+			Common
+		*/
+
+		// qqVGA ("Quarter-QVGA")
+		[2]int{120, 160}, // 3:4
+		[2]int{160, 120}, // 4:3, Standard qqVGA
+		[2]int{160, 128}, // 5:4
+
+		[2]int{320, 240}, // ???, qVGA ("Quarter VGA") (commonly inverted as 240x320 on mobile)
+
+		// HQVGA ("Half-qVGA")
+		[2]int{160, 240}, // ???
+		[2]int{240, 160}, // ???, Standard HQVGA
+
+		[2]int{240, 376}, // 3:2, WQVGA ("Wide qVGA")
+		[2]int{240, 432}, // 3:2, WQVGA
+		[2]int{360, 240}, // 3:2, WQVGA
+		[2]int{384, 240}, // 16:10 (8:5), WQVGA
+		[2]int{400, 240}, // 5:3, WQVGA
+		[2]int{426, 240}, // ???, WQVGA
+		[2]int{428, 240}, // ???, WQVGA
+		[2]int{432, 240}, // 18:10, WQVGA
+		[2]int{480, 240}, // ???, WQVGA
+
+		[2]int{480, 270}, // ???, WQVGA / HVGA ("Half-Size VGA")
+		[2]int{480, 272}, // ???, WQXGA / HVGA
+
+		[2]int{480, 320}, // 3:2, Standard HVGA
+		[2]int{480, 360}, // 4:3, HVGA
+		[2]int{640, 240}, // 8:3, HVGA
+
+		[2]int{640, 480}, // 4:3, VGA ("Video Graphics Array")
+
+		[2]int{640, 384}, // 15:9 (5:3), WVGA (WGA) ("Wide VGA")
+		[2]int{720, 480}, // 15:10 (3:2), WVGA
+		[2]int{768, 480}, // 16:10 (8:5), WVGA
+		[2]int{800, 450}, // 16:9, WVGA
+		[2]int{800, 480}, // 15:9 (5:3), Standard WVGA
+		[2]int{848, 480}, // ???, Standard WVGA
+		[2]int{852, 480}, // ???, Standard WVGA
+		[2]int{853, 480}, // ???, WVGA
+
+		[2]int{854, 480}, // ???, Full WVGA
+
+		[2]int{640, 400}, // ???, SVGA ("Super VGA") / UVGA ("Ultra VGA") / XVGA ("Extended VGA")
+		[2]int{640, 480}, // ???, SVGA / UVGA / XVGA
+		[2]int{800, 600}, // ???, Standard SVGA / UVGA
+		[2]int{830, 624}, // 4:3, SVGA / UVGA
+
+		[2]int{960, 640},  // 3:2, DVGA ("Double VGA") ("Retina")
+		[2]int{1136, 640}, // 16:9, DVGA (iPhone 5 variant)
+
+		[2]int{1024, 576}, // 16:9, WSVGA ("Wide SVGA")
+		[2]int{1024, 600}, // 128:75, WSVGA
+
+		[2]int{1024, 768}, // 4:3, XGA ("Extended Graphics Array") / SVGA
+
+		[2]int{1120, 832}, // 35:26, XGA+ ("Extended Graphics Array Plus")
+		[2]int{1152, 864}, // 4:3, Standard XGA+
+		[2]int{1152, 870}, // 192:145, XGA+
+		[2]int{1152, 900}, // 32:25, XGA+
+
+		[2]int{1152, 768}, // 16:9, WXGA ("Wide XGA")
+		[2]int{1280, 720}, // 16:9, WXGA
+		[2]int{1280, 768}, // 15:9, Standard WXGA
+		[2]int{1280, 800}, // 16:10, Standard WXGA
+
+		[2]int{1280, 854}, // ???, WXGA+ ("Wide XGA Plus")
+
+		[2]int{1360, 768}, // ???, FWXGA ("Full WXGA")
+		[2]int{1366, 768}, // ???, Standard WXGA / FWXGA
+
+		[2]int{1280, 960}, // 4:3, QuadVGA / SXVGA ("Super XVGA") / SXGA-
+
+		[2]int{1280, 1024}, // 5:4, SXGA ("Super XGA") / SVGA
+
+		[2]int{1360, 768}, // ???, FWXGA
+		[2]int{1366, 768}, // ???, WXGA
+
+		[2]int{1400, 1050}, // 4:3, SXGA+ ("Super XGA Plus")
+
+		[2]int{1440, 900}, // 16:10, WXGA+ / WSXGA ("Wide SXGA")
+
+		[2]int{1440, 960},  // 3:2, WSXGA
+		[2]int{1600, 1024}, // 25:16, WSXGA
+
+		[2]int{1600, 1200}, // 4:3, UXGA ("Ultra-XGA")
+
+		[2]int{1680, 1050}, // 16:10, WSXGA+
+
+		[2]int{1920, 1200}, // 16:10, WUXGA ("Widescreen UXGA")
+
+		[2]int{2048, 1152}, // 16:9, QWXGA ("Quad-WXGA")
+
+		[2]int{2048, 1536}, // 4:3, QXGA ("Quad-XGA")
+
+		[2]int{2560, 1600}, // 16:10, WQXGA ("Wide QXGA")
+
+		[2]int{2560, 2048}, // 5:4, QSXGA ("Quad-SXGA")
+
+		[2]int{2800, 2100}, // 4:3, QSXGA+ ("Quad-SXGA Plus")
+
+		[2]int{2880, 1800}, // 16:10, WQXGA+ ("Wide QXGA Plus")
+
+		[2]int{3200, 2048}, // 25:16, WQSXGA ("Wide QSXGA")
+
+		[2]int{3200, 2400}, // 4:3, QUXGA ("Quad Ultra-XGA")
+
+		[2]int{3840, 2400}, // 16:10, WQUXGA ("Wide QUXGA")
+
+		[2]int{1136, 640},  // 16:9, Apple variant
+		[2]int{1334, 750},  // 16:9, Apple variant
+		[2]int{1792, 828},  // ???, Apple variant
+		[2]int{2436, 1125}, // ???, Apple variant
+		[2]int{2532, 1170}, // ???, Apple variant
+		[2]int{2556, 1179}, // ???, Apple variant
+		[2]int{2688, 1242}, // ???, Apple variant
+		[2]int{2778, 1285}, // ???, Apple variant
+		[2]int{2796, 1290}, // ???, Apple variant
+
+		[2]int{2160, 1080}, // 2:1, Android variant
+		[2]int{2220, 1080}, // ???, Android variant
+		[2]int{2280, 1080}, // 19:9, Android variant
+		[2]int{2400, 1080}, // 20:9, Android variant
+		[2]int{2960, 1440}, // ???, Android variant
+		[2]int{3040, 1440}, // 19:9, Android variant
+		[2]int{3120, 1440}, // ???, Android variant
+
+		[2]int{2340, 1080}, // ???, Android/Apple variant
+
+		// Assorted rare res
+		[2]int{576, 720},  // 4:5
+		[2]int{900, 720},  // 5:4
+		[2]int{960, 720},  // 4:3
+		[2]int{1200, 720}, // 5:3
+		[2]int{1280, 720}, // 16:9
+
+		[2]int{1280, 524}, // ???
+		[2]int{1280, 532}, // ???
+		[2]int{1280, 536}, // ???
+		[2]int{1280, 540}, // ???
+		[2]int{1280, 544}, // ???
+		[2]int{1280, 640}, // ???
+		[2]int{1280, 674}, // ???
+		[2]int{1280, 692}, // ???
+
+		// 1:1 - Square
+		[2]int{1080, 1080}, // Square Standard
+
+		// 9:16 - Vertical
+		[2]int{1080, 1920}, // Standard Mobile
+
+		// 16:9 - Standard widescreen
+		[2]int{1920, 1080}, // 1080p ("Full HD"/"FHD")
+		[2]int{2560, 1440}, // 1440p ("Quad HD"/ "QHD")
+		[2]int{3840, 2160}, // 2160p ("4k Ultra-HD"/"4k UHD")
+		[2]int{7680, 4320}, // 4320p ("8k Ultra-HD"/"8k UHD")
+
+		// 16:10 - "Computer monitor" widescreen
+		[2]int{1920, 1200}, // WUXGA ("Widescreen Ultra Extended Graphics Array"), https://www.corsair.com/us/en/explorer/gamer/monitors/wuxga-resolution-explained/
+		[2]int{2560, 1600}, // WQXGA ("Wide Quad Extended Graphics Array"), https://www.lenovo.com/us/en/glossary/wqxga/
+
+		// 21:9 - Ultrawide
+		[2]int{2560, 1080}, // Ultrawide FHD
+		[2]int{3440, 1440}, // Ultrawide QHD
+
+		// 32:9 - Super Ultrawide
+		[2]int{5120, 1440},
+
+		/*
+			Cinema
+		*/
+		// 37:20 - Flat
+		[2]int{1998, 1080}, // 2k Flat DCP ("Digital Cinema Package")
+		[2]int{3996, 2160}, // 4k Flat DCP
+
+		// 1024:429 - Scope
+		[2]int{2048, 858},  // 2k Scope DCP
+		[2]int{4096, 1716}, // 4k Scope DCP
+
+		// 256:135 - Full Container
+		[2]int{2048, 1080}, // 2k Full Container DCP
+		[2]int{4096, 2160}, // 4k Full Container DCP
+	}
+)
+
+/*
+NewAspectRatio returns a new Aspect Ratio from string form ar.
+
+At least one of width or height must be > 0;
+the other can be calculated from ar.
+
+If both height and width are > 0, ar is ignored and it will be calculated from those instead.
+If both height and width are <= 0, a will be nil.
+
+If ar is an invalid format, a will be nil.
+*/
+func NewAspectRatio(ar string, width, height int) (a *AspectRatio) {
+
+	var err error
+	var arW float64
+	var arH float64
+	var arStr []string
+
+	if width <= 0 && height <= 0 {
+		return
+	} else if width > 0 && height > 0 {
+		// ar is ignored.
+		a = &AspectRatio{
+			ar: float64(width) / float64(height),
+			res: &Resolution{
+				w: width,
+				h: height,
+			},
+		}
+		a.res.ar = a
+	} else {
+		arStr = strings.SplitN(strings.TrimSpace(ar), ":", 2)
+		if len(arStr) != 2 {
+			return
+		}
+		if arH, err = strconv.ParseFloat(strings.TrimSpace(arStr[0]), 64); err != nil {
+			return
+		}
+		if arW, err = strconv.ParseFloat(strings.TrimSpace(arStr[1]), 64); err != nil {
+			return
+		}
+		a = &AspectRatio{
+			ar:  arW / arH,
+			arW: arW,
+			arH: arH,
+		}
+		a.res.ar = a
+		if width > 0 {
+			a.res.w = width
+			a.res.h = int(math.Round(float64(a.res.w) / a.ar))
+		} else {
+			a.res.h = height
+			a.res.w = int(math.Round(float64(a.res.h) * a.ar))
+		}
+	}
+
+	return
+}
+
+func NewResolution(width, height int) (r Resolution) {
+
+	r = Resolution{
+		w: width,
+		h: height,
+	}
+	r.ar = &AspectRatio{
+		res: &r,
+	}
+
+	return
+}
+
+func NewResolutions(resGeom [][2]int) (rsltns []Resolution) {
+
+	var idx int
+
+	rsltns = make([]Resolution, len(resGeom))
+	for idx = range resGeom {
+		rsltns[idx] = NewResolution(resGeom[idx][0], resGeom[idx][1])
+	}
+
+	return
+}
+
+func SortAspectRatios(ar []AspectRatio) (sorted []AspectRatio) {
+
+	slices.SortStableFunc(
+		ar,
+		func(a, b AspectRatio) (cmp int) {
+			cmp = a.Cmp(b)
+			return
+		},
+	)
+
+	return
+}
+
+func SortResolutions(res []Resolution) {
+
+	slices.SortStableFunc(
+		res,
+		func(a, b Resolution) (cmp int) {
+			cmp = a.Cmp(b)
+			return
+		},
+	)
+
+	return
+}
+
+func main() {
+
+	var ok bool
+	var idx int
+	var arStr string
+	// var ars []string
+	var ar AspectRatio
+	var res Resolution
+	var rsltns []Resolution
+	var uniqAr mapset.Set[AspectRatio] = mapset.NewSet[AspectRatio]()
+	var uniqRes mapset.Set[[2]int] = mapset.NewSet[[2]int](resolutions...)
+	var arMap map[string]mapset.Set[Resolution] = make(map[string]mapset.Set[Resolution])
+
+	rsltns = NewResolutions(uniqRes.ToSlice())
+	SortResolutions(rsltns)
+
+	for idx, res = range rsltns {
+		uniqAr.Add(res.AspectRatio())
+		ar = res.AspectRatio()
+		arStr = ar.String()
+		if _, ok = arMap[arStr]; !ok {
+			arMap[arStr] = mapset.NewSet[Resolution]()
+		}
+		arMap[arStr].Add(res)
+		fmt.Printf("#%d: %s (%s)\n", idx, res.String(), ar.FloatString())
+	}
+
+	fmt.Println("\n====\n")
+	/*
+		for _, aspRatStr = range aspRatKeys {
+			fmt.Println(aspRatStr)
+			slices.SortStableFunc(
+				aspRatRes[aspRatStr],
+				func(resA, resB [2]int) (cmp int) {
+					// default cmp is 0, which means fully equal
+					if resA[0] == resB[0] {
+						if resA[1] > resB[1] {
+							cmp = 1
+						} else {
+							cmp = -1
+						}
+					} else {
+						if resA[0] > resB[0] {
+							cmp = 1
+						} else {
+							cmp = -1
+						}
+					}
+					return
+				},
+			)
+			for _, res = range aspRatRes[aspRatStr] {
+				fmt.Printf("\t%dx%d\n", res[0], res[1])
+			}
+		}
+	*/
+}
diff --git a/go.mod b/go.mod
index 543999e..b653110 100644
--- a/go.mod
+++ b/go.mod
@@ -1,24 +1,26 @@
 module r00t2.io/sysutils
 
-go 1.25
+go 1.26
 
 require (
 	github.com/davecgh/go-spew v1.1.1
+	github.com/deckarep/golang-set/v2 v2.9.0
 	github.com/djherbis/times v1.6.0
 	github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510
-	github.com/shirou/gopsutil/v4 v4.25.12
-	golang.org/x/sync v0.19.0
-	golang.org/x/sys v0.40.0
+	github.com/shirou/gopsutil/v4 v4.26.6
+	golang.org/x/sync v0.22.0
+	golang.org/x/sys v0.47.0
 	honnef.co/go/augeas v0.0.0-20161110001225-ca62e35ed6b8
-	r00t2.io/goutils v1.16.6
+	r00t2.io/goutils v1.16.10
 )
 
 require (
-	github.com/ebitengine/purego v0.9.1 // indirect
+	github.com/ebitengine/purego v0.10.1 // indirect
 	github.com/go-ole/go-ole v1.3.0 // indirect
-	github.com/lufia/plan9stats v0.0.0-20251013123823-9fd1530e3ec3 // indirect
+	github.com/lufia/plan9stats v0.0.0-20260627054121-477a66015f15 // indirect
 	github.com/power-devops/perfstat v0.0.0-20240221224432-82ca36839d55 // indirect
-	github.com/tklauser/go-sysconf v0.3.16 // indirect
-	github.com/tklauser/numcpus v0.11.0 // indirect
+	github.com/tklauser/go-sysconf v0.4.0 // indirect
+	github.com/tklauser/numcpus v0.12.0 // indirect
 	github.com/yusufpapurcu/wmi v1.2.4 // indirect
+	go.mongodb.org/mongo-driver v1.17.9 // indirect
 )
diff --git a/go.sum b/go.sum
index b009f40..072f33c 100644
--- a/go.sum
+++ b/go.sum
@@ -1,9 +1,13 @@
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/deckarep/golang-set/v2 v2.9.0 h1:prva4eP9UysWagLyKrtn074ughi0NnkIf0A4M5yOCKI=
+github.com/deckarep/golang-set/v2 v2.9.0/go.mod h1:EWknQXbs0mcFpat2QOoXV0Ee57cD+w6ZEN76BR2JVrM=
 github.com/djherbis/times v1.6.0 h1:w2ctJ92J8fBvWPxugmXIv7Nz7Q3iDMKNx9v5ocVH20c=
 github.com/djherbis/times v1.6.0/go.mod h1:gOHeRAz2h+VJNZ5Gmc/o7iD9k4wW7NMVqieYCY99oc0=
 github.com/ebitengine/purego v0.9.1 h1:a/k2f2HQU3Pi399RPW1MOaZyhKJL9w/xFpKAg4q1s0A=
 github.com/ebitengine/purego v0.9.1/go.mod h1:iIjxzd6CiRiOG0UyXP+V1+jWqUXVjPKLAI0mRfJZTmQ=
+github.com/ebitengine/purego v0.10.1 h1:dewVBCBT2GaMu1SrNTYxQhgQBethzfhiwvZiLGP/qyY=
+github.com/ebitengine/purego v0.10.1/go.mod h1:iIjxzd6CiRiOG0UyXP+V1+jWqUXVjPKLAI0mRfJZTmQ=
 github.com/go-ole/go-ole v1.2.6/go.mod h1:pprOEPIfldk/42T2oK7lQ4v4JSDwmV0As9GaiUsvbm0=
 github.com/go-ole/go-ole v1.3.0 h1:Dt6ye7+vXGIKZ7Xtk4s6/xVdGDQynvom7xCFEdWr6uE=
 github.com/go-ole/go-ole v1.3.0/go.mod h1:5LS6F96DhAwUc7C+1HLexzMXY1xGRSryjyPPKW6zv78=
@@ -13,29 +17,49 @@ github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510 h1:El6M4kTTCOh6aBiKaU
 github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510/go.mod h1:pupxD2MaaD3pAXIBCelhxNneeOaAeabZDe5s4K6zSpQ=
 github.com/lufia/plan9stats v0.0.0-20251013123823-9fd1530e3ec3 h1:PwQumkgq4/acIiZhtifTV5OUqqiP82UAl0h87xj/l9k=
 github.com/lufia/plan9stats v0.0.0-20251013123823-9fd1530e3ec3/go.mod h1:autxFIvghDt3jPTLoqZ9OZ7s9qTGNAWmYCjVFWPX/zg=
+github.com/lufia/plan9stats v0.0.0-20260627054121-477a66015f15 h1:YkjVPl/YH5XlJ+/NiwzJtPYXXKRcyjmEUhsDci6YK3c=
+github.com/lufia/plan9stats v0.0.0-20260627054121-477a66015f15/go.mod h1:autxFIvghDt3jPTLoqZ9OZ7s9qTGNAWmYCjVFWPX/zg=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/power-devops/perfstat v0.0.0-20240221224432-82ca36839d55 h1:o4JXh1EVt9k/+g42oCprj/FisM4qX9L3sZB3upGN2ZU=
 github.com/power-devops/perfstat v0.0.0-20240221224432-82ca36839d55/go.mod h1:OmDBASR4679mdNQnz2pUhc2G8CO2JrUAVFDRBDP/hJE=
 github.com/shirou/gopsutil/v4 v4.25.12 h1:e7PvW/0RmJ8p8vPGJH4jvNkOyLmbkXgXW4m6ZPic6CY=
 github.com/shirou/gopsutil/v4 v4.25.12/go.mod h1:EivAfP5x2EhLp2ovdpKSozecVXn1TmuG7SMzs/Wh4PU=
+github.com/shirou/gopsutil/v4 v4.26.6 h1:Mzr/npDtQC/xpeEuQKHZt8Zo9CmPvhTj8nkR8w5TLDs=
+github.com/shirou/gopsutil/v4 v4.26.6/go.mod h1:LZ6ewCSkBqUpvSOf+LsTGnRinC6iaNUNMGBtDkJBaLQ=
 github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
 github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
 github.com/tklauser/go-sysconf v0.3.16 h1:frioLaCQSsF5Cy1jgRBrzr6t502KIIwQ0MArYICU0nA=
 github.com/tklauser/go-sysconf v0.3.16/go.mod h1:/qNL9xxDhc7tx3HSRsLWNnuzbVfh3e7gh/BmM179nYI=
+github.com/tklauser/go-sysconf v0.4.0 h1:7H0uAN+7RkwWRaxhYXDLqa5V3LPrJeV8wmD9dRUgPQU=
+github.com/tklauser/go-sysconf v0.4.0/go.mod h1:8mTNWyog7H+MpKijp4VmKJAd2bbYQ2zuUwkYRbUArPI=
 github.com/tklauser/numcpus v0.11.0 h1:nSTwhKH5e1dMNsCdVBukSZrURJRoHbSEQjdEbY+9RXw=
 github.com/tklauser/numcpus v0.11.0/go.mod h1:z+LwcLq54uWZTX0u/bGobaV34u6V7KNlTZejzM6/3MQ=
+github.com/tklauser/numcpus v0.12.0 h1:NR85qdvHA9pFse3x3weVZ0r0ST8R6l5RHbZrlRaqob4=
+github.com/tklauser/numcpus v0.12.0/go.mod h1:ABHeXzJnr/qqwguhClkZKT1/8VABcYrsyUiUGobwWJg=
 github.com/yusufpapurcu/wmi v1.2.4 h1:zFUKzehAFReQwLys1b/iSMl+JQGSCSjtVqQn9bBrPo0=
 github.com/yusufpapurcu/wmi v1.2.4/go.mod h1:SBZ9tNy3G9/m5Oi98Zks0QjeHVDvuK0qfxQmPyzfmi0=
+go.mongodb.org/mongo-driver v1.17.4 h1:jUorfmVzljjr0FLzYQsGP8cgN/qzzxlY9Vh0C9KFXVw=
+go.mongodb.org/mongo-driver v1.17.4/go.mod h1:Hy04i7O2kC4RS06ZrhPRqj/u4DTYkFDAAccj+rVKqgQ=
+go.mongodb.org/mongo-driver v1.17.9 h1:IexDdCuuNJ3BHrELgBlyaH9p60JXAvdzWR128q+U5tU=
+go.mongodb.org/mongo-driver v1.17.9/go.mod h1:LlOhpH5NUEfhxcAwG0UEkMqwYcc4JU18gtCdGudk/tQ=
 golang.org/x/sync v0.19.0 h1:vV+1eWNmZ5geRlYjzm2adRgW2/mcpevXNg50YZtPCE4=
 golang.org/x/sync v0.19.0/go.mod h1:9KTHXmSnoGruLpwFjVSX0lNNA75CykiMECbovNTZqGI=
+golang.org/x/sync v0.22.0 h1:SZjpbeLmrCk4xhRSZFNZW5gFUeCeFgjekvI/+gfScek=
+golang.org/x/sync v0.22.0/go.mod h1:9xrNwdLfx4jkKbNva9FpL6vEN7evnE43NNNJQ2LF3+0=
 golang.org/x/sys v0.0.0-20190916202348-b4ddaad3f8a3/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20201204225414-ed752295db88/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20220615213510-4f61da869c0c/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.1.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.40.0 h1:DBZZqJ2Rkml6QMQsZywtnjnnGvHza6BTfYFWY9kjEWQ=
 golang.org/x/sys v0.40.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
+golang.org/x/sys v0.47.0 h1:o7XGOvZQCADBQQ4Y7VNq2dRWQR7JmOUW8Kxx4ZsNgWs=
+golang.org/x/sys v0.47.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 honnef.co/go/augeas v0.0.0-20161110001225-ca62e35ed6b8 h1:FW42yWB1sGClqswyHIB68wo0+oPrav1IuQ+Tdy8Qp8E=
 honnef.co/go/augeas v0.0.0-20161110001225-ca62e35ed6b8/go.mod h1:44w9OfBSQ9l3o59rc2w3AnABtE44bmtNnRMNC7z+oKE=
+r00t2.io/goutils v1.16.6 h1:nZ6lFqhiM3m/1yNvdIdiP2VvuQr5ZRvYPbj3oM657Aw=
+r00t2.io/goutils v1.16.6/go.mod h1:VXsgdl3QoiP9bgqykYpJ/NwoxZ992jslMiV32EhaIOc=
+r00t2.io/goutils v1.16.10 h1:2XSTVAyW35+hC/VEysQahMKTcSSEH7uaOv1a72lsnXc=
+r00t2.io/goutils v1.16.10/go.mod h1:rv7k/RWprVhoZjacmL+Jv6GjvME3BpOO8OsdoXPqy8I=
diff --git a/paths/TODO b/paths/TODO
index 6a167df..4dd5416 100644
--- a/paths/TODO
+++ b/paths/TODO
@@ -1,8 +1,10 @@
+
 - search criteria should *also* support a timestamp range (e.g. so a search can be restricted to both older than AND newer than; e.g. older than 00:00, newer than 01:00)
 
 - need an ExpandHomeSys (...which will change ExpandHome behavior, if it switches to path instead of path/filepath...)
 -- Should probably split out to a separate module or branch to v2.
--- separate module:
+-- get rid of the *Sys stuff? Normalize all to os.PathSep? provide package-level bool to control behavior? 
+-- separate modules ideal:
 --- r00t2.io/paths/
                   <generic>
                   gopath/
@@ -10,3 +12,4 @@
                   syspath/
 			<os.PathSeparator>
 	I could consolidate a LOT of code if I use a struct that has a mode (or typed against different separators?) etc. but...
+--- Need to test with e.g. "network share paths" - URI format (<scheme>://<path>), \\host\share, etc.