golang exec vs exec sh

main.go.diff

	grep := exec.CommandContext(ctx,
-		"grep",
-		"-Er",
-		`'\bflag\.[A-Z]'`,
-		path,
+		"sh", "-c", strings.Join([]string{
+			"grep",
+			"-Er",
+			`'\bflag\.[A-Z]'`,
+			path,
+		}, " "),
	)
  

out.md

Before (running grep directly in exec.Command)

2022/07/18 16:12:41 I: running /usr/bin/grep -Er \bflag\.[A-Z]" ./go/acl/
2022/07/18 16:12:41 D: dir=     path=/usr/bin/grep
2022/07/18 16:12:41 
2022/07/18 16:12:41 exit status 1
exit status 1

After (running grep via sh -c within exec.Command)

2022/07/19 06:15:41 I: running /bin/sh -c grep -Er '\bflag\.[A-Z]' ./go/acl/
2022/07/19 06:15:41 D: dir=     path=/bin/sh
go/acl/acl.go:  securityPolicy = flag.String("security_policy", "", "the name of a registered security policy to use for controlling access to URLs - empty means allow all for anyone (built-in policies: deny-all, read-only)")