chore: write gentx info to cmd.ErrOrStderr (#20616)

CHANGELOG.md

@@ -186,6 +186,7 @@ Every module contains its own CHANGELOG.md. Please refer to the module you are i
 * (server) [#20140](https://github.com/cosmos/cosmos-sdk/pull/20140) Remove embedded grpc-web proxy in favor of standalone grpc-web proxy. [Envoy Proxy](https://www.envoyproxy.io/docs/envoy/latest/start/start)
 * (client) [#20255](https://github.com/cosmos/cosmos-sdk/pull/20255) Use comet proofOp proto type instead of sdk version to avoid needing to translate to later be proven in the merkle proof runtime. 
 * (all) [#19726](https://github.com/cosmos/cosmos-sdk/pull/19726) Integrate comet v1
+* (client) [#20616](https://github.com/cosmos/cosmos-sdk/pull/20616) gentx subcommand output goes to `cmd.ErrOrStderr()` instead of being hardcoded to `os.Stderr`
 
 ### Client Breaking Changes
 

x/genutil/client/cli/collect.go

@@ -52,7 +52,7 @@ func CollectGenTxsCmd(genBalIterator types.GenesisBalancesIterator, validator ty
 
 			toPrint.AppMessage = appMessage
 
-			return displayInfo(toPrint)
+			return displayInfo(cmd.ErrOrStderr(), toPrint)
 		},
 	}
 

x/genutil/client/cli/init.go

@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"io"
 	"os"
 	"path/filepath"
 
@@ -58,13 +59,13 @@ func newPrintInfo(moniker, chainID, nodeID, genTxsDir string, appMessage json.Ra
 	}
 }
 
-func displayInfo(info printInfo) error {
+func displayInfo(dst io.Writer, info printInfo) error {
 	out, err := json.MarshalIndent(info, "", " ")
 	if err != nil {
 		return err
 	}
 
-	_, err = fmt.Fprintf(os.Stderr, "%s\n", out)
+	_, err = fmt.Fprintf(dst, "%s\n", out)
 
 	return err
 }
@@ -175,7 +176,7 @@ func InitCmd(mm *module.Manager) *cobra.Command {
 			toPrint := newPrintInfo(config.Moniker, chainID, nodeID, "", appState)
 
 			cfg.WriteConfigFile(filepath.Join(config.RootDir, "config", "config.toml"), config)
-			return displayInfo(toPrint)
+			return displayInfo(cmd.ErrOrStderr(), toPrint)
 		},
 	}