fix: support output flag on tx commands (backport #9717) (#9771)

* fix: support output flag on tx commands (#9717)

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## Description

Closes: #9684

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---

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- [ ] included the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] added `!` to the type prefix if API or client breaking change
- [ ] targeted the correct branch (see [PR Targeting](https://github.com/cosmos/cosmos-sdk/blob/master/CONTRIBUTING.md#pr-targeting))
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- [ ] included the necessary unit and integration [tests](https://github.com/cosmos/cosmos-sdk/blob/master/CONTRIBUTING.md#testing)
- [ ] added a changelog entry to `CHANGELOG.md`
- [ ] included comments for [documenting Go code](https://blog.golang.org/godoc)
- [ ] updated the relevant documentation or specification
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- [ ] confirmed the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] confirmed `!` in the type prefix if API or client breaking change
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- [ ] manually tested (if applicable)

(cherry picked from commit 9253503)

* Fix changelog

Co-authored-by: Sai Kumar <[email protected]>
Co-authored-by: Amaury M <[email protected]>

CHANGELOG.md

@@ -35,6 +35,12 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 # Changelog
 
+## [Unreleased]
+
+### Improvements
+
+* (cli) [\#9717](https://github.com/cosmos/cosmos-sdk/pull/9717) Added CLI flag `--output json/text` to `tx` cli commands.
+
 ## [v0.43.0-rc2](https://github.com/cosmos/cosmos-sdk/releases/tag/v0.43.0-rc2) - 2021-07-19
 
 ### Bug Fixes

client/flags/flags.go

@@ -93,6 +93,7 @@ func AddQueryFlagsToCmd(cmd *cobra.Command) {
 
 // AddTxFlagsToCmd adds common flags to a module tx command.
 func AddTxFlagsToCmd(cmd *cobra.Command) {
+	cmd.Flags().StringP(tmcli.OutputFlag, "o", "json", "Output format (text|json)")
 	cmd.Flags().String(FlagKeyringDir, "", "The client Keyring directory; if omitted, the default 'home' directory will be used")
 	cmd.Flags().String(FlagFrom, "", "Name or address of private key with which to sign")
 	cmd.Flags().Uint64P(FlagAccountNumber, "a", 0, "The account number of the signing account (offline mode only)")