Adjust shell quoting

acid.go

@@ -102,7 +102,7 @@ var shellFuncs = ttemplate.FuncMap{
 	"quote": func(word string) string {
 		// History expansion is annoying, don't let it cut us.
 		if strings.IndexRune(word, '!') >= 0 {
-			return "'" + strings.ReplaceAll(word, "'", `'"'"'`) + "'"
+			return "'" + strings.ReplaceAll(word, "'", `'\''`) + "'"
 		}
 
 		const special = "$`\"\\"

acid_test.go

@@ -12,7 +12,7 @@ func TestTemplateQuote(t *testing.T) {
 	for _, test := range []struct {
 		input, output string
 	}{
-		{`!!`, `'!!'`},
+		{`!!'!$`, `'!!'\''!$'`},
 		{``, `""`},
 		{`${var}`, `"\${var}"`},
 		{"`cat`", "\"\\`cat\\`\""},