使用Makefile执行命令时如何显示完整输出？

直接执行命令时，能得到完整输出：

[GIN-debug] GET    /internal/login           --> myproject/app_demo.AppHandler.InternalLogin-fm (7 handlers)
[GIN-debug] POST   /wp/index                 --> myproject/wp_demo.indexHandler (6 handlers)
[GIN-debug] POST   /wp/single                --> myproject/wp_demo.singleHandler (6 handlers)
[GIN-debug] POST   /wp/posts                 --> myproject/wp_demo.postsHandler (6 handlers)
[GIN-debug] POST   /wp/counts                --> myproject/wp_demo.countsHandler (6 handlers)
[GIN-debug] POST   /wp/get_options           --> myproject/wp_demo.getOptionsHandler (6 handlers)
[GIN-debug] POST   /cful/index               --> myproject/cful_demo.indexHandler (6 handlers)
[GIN-debug] POST   /cful/single              --> myproject/cful_demo.singleHandler (6 handlers)
[GIN-debug] POST   /cful/posts               --> myproject/cful_demo.postsHandler (6 handlers)
[GIN-debug] POST   /cful/counts              --> myproject/cful_demo.countsHandler (6 handlers)
[GIN-debug] POST   /cms/index                --> myproject/cms_demo.CmsHandler.indexHandler-fm (7 handlers)
[GIN-debug] POST   /cms/single               --> myproject/cms_demo.CmsHandler.singleHandler-fm (7 handlers)
[GIN-debug] POST   /cms/posts                --> myproject/cms_demo.CmsHandler.postsHandler-fm (7 handlers)
[GIN-debug] POST   /cms/counts               --> myproject/cms_demo.CmsHandler.countsHandler-fm (7 handlers)
2022/12/29 12:17:54 Http Sever started at http://localhost:2111
[GIN-debug] [WARNING] You trusted all proxies, this is NOT safe. We recommend you to set a value.
Please check https://pkg.go.dev/github.com/gin-gonic/gin#readme-don-t-trust-all-proxies for details.
[GIN-debug] Listening and serving HTTP on :2111

但执行make watch时，仅输出：

➜  myproject git:(main) ✗ make watch
2022/12/29 12:18:23 Http Sever started at http://localhost:2111

当前Makefile内容：

hello:
    @echo "Hello, Mango"

watch:
    @echo `air`

问题根源在于@echo \air`的写法：这种方式会执行air`命令，但只捕获它的标准输出（stdout），而Gin的调试日志、警告信息是输出到**标准错误（stderr）**的，这部分内容被直接丢弃，所以只显示了服务启动的一行日志。

修改Makefile的watch目标，直接执行air命令即可：

hello:
    @echo "Hello, Mango"

watch:
    air

如果不想让Makefile打印出air这个命令本身，可以保留@符号：

watch:
    @air

修改后，air的标准输出和标准错误都会被正常输出，就能看到完整的Gin调试日志、警告及服务启动信息了。

内容的提问来源于stack exchange，提问作者Khanakia