Sort is now working.

sort/.gitignore

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+sort
+sort.exe

sort/Makefile

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+
+
+build:
+	go build .

sort/go.mod

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+module lcthw.dev/go/go-coreutils/sort
+
+go 1.25.3

sort/main.go

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+package main
+
+import (
+  "fmt"
+  "bufio"
+  "os"
+  "slices"
+  "flag"
+  "strings"
+  "strconv"
+)
+
+type Opts struct {
+  IgnoreCase bool
+  Numeric bool
+}
+
+func parse_opts() Opts {
+  var opts Opts
+
+  flag.BoolVar(&opts.IgnoreCase, "f", false, "ignore case")
+  flag.BoolVar(&opts.Numeric, "n", false, "numeric sort")
+
+  flag.Parse()
+
+  return opts
+}
+
+func numeric_sort(a string, b string) int {
+  a_int, a_err := strconv.Atoi(a)
+  b_int, b_err := strconv.Atoi(b)
+
+  if a_err != nil || b_err != nil {
+    return strings.Compare(a, b)
+  } else {
+    return a_int - b_int
+  }
+}
+
+func ignore_case_sort(a string, b string) int {
+  return strings.Compare(strings.ToLower(a), strings.ToLower(b))
+}
+
+func main() {
+  lines := make([]string, 0, 100)
+  opts := parse_opts()
+
+  scan := bufio.NewScanner(os.Stdin)
+
+  for scan.Scan() {
+    line := scan.Text()
+    lines = append(lines, line)
+  }
+
+  if opts.Numeric {
+    slices.SortFunc(lines, numeric_sort)
+  } else if opts.IgnoreCase{
+    slices.SortFunc(lines, ignore_case_sort)
+  } else {
+    slices.Sort(lines)
+  }
+
+  for _, line := range lines {
+    fmt.Println(line)
+  }
+}

sort/test.txt

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+head
+numfmt
+od
+sha512sum
+sort
+starter
+LICENSE
+outline.txt
+README.md
+stat
+tail
+tr
+uniq
+cat
+date
+du
+wc
+.gitignore