diff --git a/pkg/bifs/arithmetic.go b/pkg/bifs/arithmetic.go
index fc8309775..0ad936df6 100644
--- a/pkg/bifs/arithmetic.go
+++ b/pkg/bifs/arithmetic.go
@@ -545,70 +545,6 @@ func BIF_dot_divide(input1, input2 *mlrval.Mlrval) *mlrval.Mlrval {
 	return dotdivide_dispositions[input1.Type()][input2.Type()](input1, input2)
 }
 
-// 64-bit integer division: DSL operator './/'.  See also
-// https://miller.readthedocs.io/en/latest/reference-main-arithmetic
-
-func dotidivide_i_ii(input1, input2 *mlrval.Mlrval) *mlrval.Mlrval {
-	a := input1.AcquireIntValue()
-	b := input2.AcquireIntValue()
-
-	if b == 0 {
-		// Compute inf/nan as with floats rather than fatal runtime FPE on integer divide by zero
-		return mlrval.FromFloat(float64(a) / float64(b))
-	}
-
-	// Pythonic division, not C division.
-	q := a / b
-	r := a % b
-	if a < 0 {
-		if b > 0 {
-			if r != 0 {
-				q--
-			}
-		}
-	} else {
-		if b < 0 {
-			if r != 0 {
-				q--
-			}
-		}
-	}
-	return mlrval.FromInt(q)
-}
-
-func dotidivide_f_if(input1, input2 *mlrval.Mlrval) *mlrval.Mlrval {
-	return mlrval.FromFloat(math.Floor(float64(input1.AcquireIntValue()) / input2.AcquireFloatValue()))
-}
-func dotidivide_f_fi(input1, input2 *mlrval.Mlrval) *mlrval.Mlrval {
-	return mlrval.FromFloat(math.Floor(input1.AcquireFloatValue() / float64(input2.AcquireIntValue())))
-}
-func dotidivide_f_ff(input1, input2 *mlrval.Mlrval) *mlrval.Mlrval {
-	return mlrval.FromFloat(math.Floor(input1.AcquireFloatValue() / input2.AcquireFloatValue()))
-}
-
-func didte(input1, input2 *mlrval.Mlrval) *mlrval.Mlrval {
-	return mlrval.FromTypeErrorBinary(".//", input1, input2)
-}
-
-var dotidivide_dispositions = [mlrval.MT_DIM][mlrval.MT_DIM]BinaryFunc{
-	//       .  INT              FLOAT            BOOL   VOID   STRING ARRAY  MAP    FUNC    ERROR   NULL   ABSENT
-	/*INT    */ {dotidivide_i_ii, dotidivide_f_if, didte, _void, didte, _absn, _absn, didte, didte, didte, _1___},
-	/*FLOAT  */ {dotidivide_f_fi, dotidivide_f_ff, didte, _void, didte, _absn, _absn, didte, didte, didte, _1___},
-	/*BOOL   */ {didte, didte, didte, didte, didte, _absn, _absn, didte, didte, didte, didte},
-	/*VOID   */ {_void, _void, didte, _void, didte, _absn, _absn, didte, didte, didte, _absn},
-	/*STRING */ {didte, didte, didte, didte, didte, _absn, _absn, didte, didte, didte, didte},
-	/*ARRAY  */ {_absn, _absn, _absn, _absn, _absn, _absn, _absn, didte, _absn, _absn, _absn},
-	/*MAP    */ {_absn, _absn, _absn, _absn, _absn, _absn, _absn, didte, _absn, _absn, _absn},
-	/*FUNC   */ {didte, didte, didte, didte, didte, didte, didte, didte, didte, didte, didte},
-	/*ERROR  */ {didte, didte, didte, didte, didte, _absn, _absn, didte, didte, didte, didte},
-	/*NULL   */ {didte, didte, didte, didte, didte, _absn, _absn, didte, didte, didte, _absn},
-	/*ABSENT */ {_2___, _2___, didte, _absn, didte, _absn, _absn, didte, didte, didte, _absn},
-}
-
-func BIF_dot_int_divide(input1, input2 *mlrval.Mlrval) *mlrval.Mlrval {
-	return dotidivide_dispositions[input1.Type()][input2.Type()](input1, input2)
-}
-
 // Modulus
 
 func modulus_i_ii(input1, input2 *mlrval.Mlrval) *mlrval.Mlrval {
diff --git a/pkg/bifs/arithmetic_test.go b/pkg/bifs/arithmetic_test.go
index 393a3a968..8f83d22f0 100644
--- a/pkg/bifs/arithmetic_test.go
+++ b/pkg/bifs/arithmetic_test.go
@@ -78,7 +78,6 @@ func TestBIF_plus_binary_overflow(t *testing.T) {
 //func BIF_dot_minus(input1, input2 *mlrval.Mlrval) *mlrval.Mlrval
 //func BIF_dot_times(input1, input2 *mlrval.Mlrval) *mlrval.Mlrval
 //func BIF_dot_divide(input1, input2 *mlrval.Mlrval) *mlrval.Mlrval
-//func BIF_dot_int_divide(input1, input2 *mlrval.Mlrval) *mlrval.Mlrval
 //func BIF_modulus(input1, input2 *mlrval.Mlrval) *mlrval.Mlrval
 //func BIF_mod_add(input1, input2, input3 *mlrval.Mlrval) *mlrval.Mlrval
 //func BIF_mod_sub(input1, input2, input3 *mlrval.Mlrval) *mlrval.Mlrval
diff --git a/pkg/bifs/base.go b/pkg/bifs/base.go
index 29521261b..7d9671714 100644
--- a/pkg/bifs/base.go
+++ b/pkg/bifs/base.go
@@ -99,13 +99,6 @@ func _zero1(input1 *mlrval.Mlrval) *mlrval.Mlrval {
 	return mlrval.FromInt(0)
 }
 
-// Return one (unary)
-//
-//lint:ignore U1000 util function might be used later
-func __one1(input1 *mlrval.Mlrval) *mlrval.Mlrval {
-	return mlrval.FromInt(1)
-}
-
 // Return null (unary)
 func _null1(input1 *mlrval.Mlrval) *mlrval.Mlrval {
 	return mlrval.NULL
diff --git a/pkg/colorizer/colorizer.go b/pkg/colorizer/colorizer.go
index facaf53da..e1676b736 100644
--- a/pkg/colorizer/colorizer.go
+++ b/pkg/colorizer/colorizer.go
@@ -58,20 +58,6 @@ func SetFailColor(name string) bool {
 	}
 	return ok
 }
-func SetREPLPS1Color(name string) bool {
-	escape, ok := lumin.MakeANSIEscapesFromName(name)
-	if ok {
-		replPS1ColorString = escape
-	}
-	return ok
-}
-func SetREPLPS2Color(name string) bool {
-	escape, ok := lumin.MakeANSIEscapesFromName(name)
-	if ok {
-		replPS2ColorString = escape
-	}
-	return ok
-}
 func SetHelpColor(name string) bool {
 	escape, ok := lumin.MakeANSIEscapesFromName(name)
 	if ok {
diff --git a/pkg/dkvpx/dkvpx_writer.go b/pkg/dkvpx/dkvpx_writer.go
index 98a73e0d1..f72a1a3f3 100644
--- a/pkg/dkvpx/dkvpx_writer.go
+++ b/pkg/dkvpx/dkvpx_writer.go
@@ -1,99 +1,12 @@
-// Package dkvpx (see also dkvpx_reader.go) writes DKVPX records: comma-delimited
+// Package dkvpx (see also dkvpx_reader.go) handles DKVPX records: comma-delimited
 // key=value pairs with selective quoting. Keys and values are double-quoted only
 // when they contain comma, equals, newline, or double-quote.
 package dkvpx
 
 import (
-	"bufio"
-	"io"
 	"strings"
-
-	"github.com/johnkerl/miller/v6/pkg/lib"
 )
 
-// A Writer writes DKVPX records. It mirrors the structure of csv.Writer.
-type Writer struct {
-	Comma   rune // Pair delimiter (set to ',' by NewWriter)
-	UseCRLF bool // True to use \r\n as the line terminator
-	w       *bufio.Writer
-}
-
-// NewWriter returns a new Writer that writes to w.
-func NewWriter(w io.Writer) *Writer {
-	return &Writer{
-		Comma: ',',
-		w:     bufio.NewWriter(w),
-	}
-}
-
-// Write writes a single DKVPX record. Keys and values are quoted only when
-// they contain comma, equals, newline, or double-quote.
-func (w *Writer) Write(record *lib.OrderedMap[string]) error {
-	if record == nil || record.IsEmpty() {
-		return w.writeLineEnd()
-	}
-
-	first := true
-	for pe := record.Head; pe != nil; pe = pe.Next {
-		if !first {
-			if _, err := w.w.WriteRune(w.Comma); err != nil {
-				return err
-			}
-		}
-		first = false
-
-		if err := w.writeQuotedIfNeeded(pe.Key); err != nil {
-			return err
-		}
-		if err := w.w.WriteByte('='); err != nil {
-			return err
-		}
-		if err := w.writeQuotedIfNeeded(pe.Value); err != nil {
-			return err
-		}
-	}
-
-	return w.writeLineEnd()
-}
-
-// writeQuotedIfNeeded writes the string, adding surrounding quotes and escaping
-// internal quotes only when the string contains comma, equals, newline, or quote.
-func (w *Writer) writeQuotedIfNeeded(s string) error {
-	if !needsQuoting(s) {
-		_, err := w.w.WriteString(s)
-		return err
-	}
-
-	if err := w.w.WriteByte('"'); err != nil {
-		return err
-	}
-	// Escape " as ""
-	for len(s) > 0 {
-		i := strings.IndexAny(s, "\"\r\n")
-		if i < 0 {
-			i = len(s)
-		}
-		if _, err := w.w.WriteString(s[:i]); err != nil {
-			return err
-		}
-		s = s[i:]
-		if len(s) > 0 {
-			switch s[0] {
-			case '"':
-				if _, err := w.w.WriteString(`""`); err != nil {
-					return err
-				}
-			case '\r', '\n':
-				if err := w.w.WriteByte(s[0]); err != nil {
-					return err
-				}
-			}
-			s = s[1:]
-		}
-	}
-	return w.w.WriteByte('"')
-}
-
 // needsQuoting reports whether the string must be quoted (contains comma,
 // equals, newline, or double-quote).
 func needsQuoting(s string) bool {
@@ -120,32 +33,3 @@ func FormatField(s string) string {
 	b.WriteByte('"')
 	return b.String()
 }
-
-func (w *Writer) writeLineEnd() error {
-	if w.UseCRLF {
-		_, err := w.w.WriteString("\r\n")
-		return err
-	}
-	return w.w.WriteByte('\n')
-}
-
-// Flush writes any buffered data to the underlying io.Writer.
-func (w *Writer) Flush() {
-	w.w.Flush()
-}
-
-// Error reports any error that has occurred during a previous Write or Flush.
-func (w *Writer) Error() error {
-	_, err := w.w.Write(nil)
-	return err
-}
-
-// WriteAll writes multiple DKVPX records and then calls Flush.
-func (w *Writer) WriteAll(records []*lib.OrderedMap[string]) error {
-	for _, record := range records {
-		if err := w.Write(record); err != nil {
-			return err
-		}
-	}
-	return w.w.Flush()
-}
diff --git a/pkg/dkvpx/dkvpx_writer_test.go b/pkg/dkvpx/dkvpx_writer_test.go
index 66d5270b6..e64a6d227 100644
--- a/pkg/dkvpx/dkvpx_writer_test.go
+++ b/pkg/dkvpx/dkvpx_writer_test.go
@@ -4,68 +4,45 @@ import (
 	"strings"
 	"testing"
 
-	"github.com/johnkerl/miller/v6/pkg/lib"
 	"github.com/stretchr/testify/assert"
 )
 
-func TestWrite_Basic(t *testing.T) {
-	var buf strings.Builder
-	wr := NewWriter(&buf)
-	rec := lib.NewOrderedMap[string]()
-	rec.Put("x", "1")
-	rec.Put("y", "2")
-	rec.Put("z", "3")
-	err := wr.Write(rec)
-	assert.NoError(t, err)
-	wr.Flush()
-	assert.NoError(t, wr.Error())
-	assert.Equal(t, "x=1,y=2,z=3\n", buf.String())
+func TestFormatField_Basic(t *testing.T) {
+	assert.Equal(t, "x", FormatField("x"))
+	assert.Equal(t, "1", FormatField("1"))
+	assert.Equal(t, "abc def", FormatField("abc def"))
 }
 
-func TestWrite_QuotesWhenNeeded(t *testing.T) {
-	var buf strings.Builder
-	wr := NewWriter(&buf)
-	rec := lib.NewOrderedMap[string]()
-	rec.Put("x,y", "a,b,c")
-	rec.Put("z", "3")
-	err := wr.Write(rec)
-	assert.NoError(t, err)
-	wr.Flush()
-	assert.Equal(t, `"x,y"="a,b,c",z=3`+"\n", buf.String())
+func TestFormatField_QuotesWhenNeeded(t *testing.T) {
+	assert.Equal(t, `"x,y"`, FormatField("x,y"))
+	assert.Equal(t, `"a,b,c"`, FormatField("a,b,c"))
 }
 
-func TestWrite_ValueWithEquals(t *testing.T) {
-	var buf strings.Builder
-	wr := NewWriter(&buf)
-	rec := lib.NewOrderedMap[string]()
-	rec.Put("a", "b=c")
-	err := wr.Write(rec)
-	assert.NoError(t, err)
-	wr.Flush()
-	assert.Equal(t, `a="b=c"`+"\n", buf.String())
+func TestFormatField_ValueWithEquals(t *testing.T) {
+	assert.Equal(t, `"b=c"`, FormatField("b=c"))
 }
 
-func TestWrite_EscapedQuotes(t *testing.T) {
-	var buf strings.Builder
-	wr := NewWriter(&buf)
-	rec := lib.NewOrderedMap[string]()
-	rec.Put("x", `the "word"`)
-	err := wr.Write(rec)
-	assert.NoError(t, err)
-	wr.Flush()
-	assert.Equal(t, `x="the ""word"""`+"\n", buf.String())
+func TestFormatField_EscapedQuotes(t *testing.T) {
+	assert.Equal(t, `"the ""word"""`, FormatField(`the "word"`))
 }
 
-func TestWrite_RoundTrip(t *testing.T) {
+func TestFormatField_RoundTrip(t *testing.T) {
 	input := `"x,y"="a,b,c",z=3` + "\n"
 	rdr := NewReader(strings.NewReader(input))
 	rec, err := rdr.Read()
 	assert.NoError(t, err)
 
-	var buf strings.Builder
-	wr := NewWriter(&buf)
-	err = wr.Write(rec)
-	assert.NoError(t, err)
-	wr.Flush()
-	assert.Equal(t, input, buf.String())
+	var sb strings.Builder
+	first := true
+	for pe := rec.Head; pe != nil; pe = pe.Next {
+		if !first {
+			sb.WriteByte(',')
+		}
+		first = false
+		sb.WriteString(FormatField(pe.Key))
+		sb.WriteByte('=')
+		sb.WriteString(FormatField(pe.Value))
+	}
+	sb.WriteByte('\n')
+	assert.Equal(t, input, sb.String())
 }
diff --git a/pkg/lib/logger.go b/pkg/lib/logger.go
index 99a26d431..3c1a70a34 100644
--- a/pkg/lib/logger.go
+++ b/pkg/lib/logger.go
@@ -98,15 +98,3 @@ func InternalCodingErrorPanic(message string) {
 		)
 	}
 }
-
-// WhereAreWe shows a stack trace from the current callsite.
-func WhereAreWe() {
-	// Start at 1, not 0, since this function itself is not of interest.
-	for i := 1; i < 20; i++ {
-		_, fileName, fileLine, ok := runtime.Caller(i)
-		if !ok {
-			break
-		}
-		fmt.Printf("  %s %d\n", fileName, fileLine)
-	}
-}
diff --git a/pkg/lib/util.go b/pkg/lib/util.go
index 24e4261a5..5811cc364 100644
--- a/pkg/lib/util.go
+++ b/pkg/lib/util.go
@@ -52,15 +52,6 @@ func StringListToSet(stringList []string) map[string]bool {
 	return stringSet
 }
 
-// ReverseStringList reverses strs in place.
-//
-// Deprecated: use slices.Reverse instead.
-//
-//go:fix inline
-func ReverseStringList(strs []string) {
-	slices.Reverse(strs)
-}
-
 // SortedStrings returns a new slice containing the strings in strs in ascending order.
 func SortedStrings(strs []string) []string {
 	result := make([]string, len(strs))
@@ -190,15 +181,6 @@ func WriteTempFileOrDie(contents string) string {
 	return handle.Name()
 }
 
-// CopyStringArray returns a copy of input.
-//
-// Deprecated: use slices.Clone instead.
-//
-//go:fix inline
-func CopyStringArray(input []string) []string {
-	return slices.Clone(input)
-}
-
 func StripEmpties(input []string) []string {
 	output := make([]string, 0, len(input))
 	for _, e := range input {
diff --git a/pkg/mlrval/mlrval_cmp.go b/pkg/mlrval/mlrval_cmp.go
index 9a85eba82..00110b066 100644
--- a/pkg/mlrval/mlrval_cmp.go
+++ b/pkg/mlrval/mlrval_cmp.go
@@ -27,9 +27,6 @@ type CmpFuncInt func(input1, input2 *Mlrval) int // -1, 0, 1 for <=>
 func Equals(input1, input2 *Mlrval) bool {
 	return cmp_dispositions[input1.Type()][input2.Type()](input1, input2) == 0
 }
-func NotEquals(input1, input2 *Mlrval) bool {
-	return cmp_dispositions[input1.Type()][input2.Type()](input1, input2) != 0
-}
 func GreaterThan(input1, input2 *Mlrval) bool {
 	return cmp_dispositions[input1.Type()][input2.Type()](input1, input2) > 0
 }
diff --git a/pkg/mlrval/mlrval_cmp_test.go b/pkg/mlrval/mlrval_cmp_test.go
index 047f5bfa4..da52d6c4f 100644
--- a/pkg/mlrval/mlrval_cmp_test.go
+++ b/pkg/mlrval/mlrval_cmp_test.go
@@ -51,20 +51,6 @@ func TestEqual(t *testing.T) {
 	}
 }
 
-func TestNotEquals(t *testing.T) {
-	for i := range orderedMlrvals {
-		mvi := orderedMlrvals[i]
-		for j := range orderedMlrvals {
-			mvj := orderedMlrvals[j]
-			assert.Equal(t, i != j, NotEquals(mvi, mvj), fmt.Sprintf(
-				"slots i=%d type=%s value=%s, j=%d type=%s value=%s",
-				i, mvi.GetTypeName(), mvi.String(),
-				j, mvj.GetTypeName(), mvj.String(),
-			))
-		}
-	}
-}
-
 func TestLessThan(t *testing.T) {
 	for i := range orderedMlrvals {
 		mvi := orderedMlrvals[i]
diff --git a/pkg/mlrval/mlrval_infer.go b/pkg/mlrval/mlrval_infer.go
index 988c85615..1b6dd0ebf 100644
--- a/pkg/mlrval/mlrval_infer.go
+++ b/pkg/mlrval/mlrval_infer.go
@@ -24,11 +24,6 @@ type tInferrer func(mv *Mlrval) *Mlrval
 
 var packageLevelInferrer tInferrer = inferNormally
 
-// SetInferNormally is the default behavior.
-func SetInferNormally() {
-	packageLevelInferrer = inferNormally
-}
-
 // SetInferrerOctalAsInt is for mlr -O.
 func SetInferrerOctalAsInt() {
 	packageLevelInferrer = inferWithOctalAsInt
diff --git a/pkg/scan/find.go b/pkg/scan/find.go
index f3b0cadc9..f202e6c6e 100644
--- a/pkg/scan/find.go
+++ b/pkg/scan/find.go
@@ -1,7 +1,5 @@
 package scan
 
-import ()
-
 // TODO: comment re context
 
 //  o grammar for numbers & case-through
@@ -53,11 +51,6 @@ func FindScanType(sinput string) ScanType {
 	return scanTypeString
 }
 
-// Convenience function for unit test
-func findScanTypeName(sinput string) string {
-	return TypeNames[FindScanType(sinput)]
-}
-
 func findScanTypePositiveNumberOrString(input []byte) ScanType {
 	if len(input) == 0 {
 		return scanTypeString
diff --git a/pkg/scan/find_test.go b/pkg/scan/find_test.go
index e1eba0437..c8f2aeb2c 100644
--- a/pkg/scan/find_test.go
+++ b/pkg/scan/find_test.go
@@ -6,6 +6,11 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
+// Convenience function for unit test
+func findScanTypeName(sinput string) string {
+	return TypeNames[FindScanType(sinput)]
+}
+
 func TestFindScanTypeNameStrings(t *testing.T) {
 	assert.Equal(t, typeNameString, findScanTypeName(""))
 	assert.Equal(t, typeNameString, findScanTypeName("-"))
diff --git a/pkg/terminals/script/types.go b/pkg/terminals/script/types.go
index 89a255f98..78b358b78 100644
--- a/pkg/terminals/script/types.go
+++ b/pkg/terminals/script/types.go
@@ -15,8 +15,7 @@ import (
 )
 
 type Script struct {
-	exeName string
-	name    string
+	name string
 
 	doWarnings  bool
 	cstRootNode *cst.RootNode
diff --git a/pkg/types/slice_list.go b/pkg/types/slice_list.go
deleted file mode 100644
index ebd75d70b..000000000
--- a/pkg/types/slice_list.go
+++ /dev/null
@@ -1,34 +0,0 @@
-package types
-
-// List is a thin wrapper around a slice which functions as a list/queue.  The Items attribute is
-// exposed as public since I want iteration (at many, many callsites) to be easy.
-type List[T any] struct {
-	Items []T
-}
-
-func NewList[T any](capacity int) *List[T] {
-	return &List[T]{
-		make([]T, 0, capacity),
-	}
-}
-
-// Front will panic if the list is empty
-func (ell *List[T]) Front() T {
-	return ell.Items[0]
-}
-
-func (ell *List[T]) Len() int {
-	return len(ell.Items)
-}
-
-func (ell *List[T]) PushBack(e T) {
-	ell.Items = append(ell.Items, e)
-}
-
-func (ell *List[T]) PushBackMultiple(mell []T) {
-	ell.Items = append(ell.Items, mell...)
-}
-
-func (ell *List[T]) Clear() {
-	ell.Items = ell.Items[0:0:cap(ell.Items)]
-}