From 195f009f5bb271564956cf48f17ca7b9d59e6c4f Mon Sep 17 00:00:00 2001
From: bicijinlian <bicijinlian@163.com>
Date: Tue, 18 Jan 2022 00:53:19 +0800
Subject: [PATCH] =?UTF-8?q?shell=E5=91=BD=E4=BB=A4?=
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---
 Build/学习.md | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/Build/学习.md b/Build/学习.md
index f848e87..c9472fc 100644
--- a/Build/学习.md
+++ b/Build/学习.md
@@ -601,6 +601,24 @@ docker run -p 80:80/tcp -p 80:80/udp ...
   > 
   > 对于当前镜像的构建没有一点影响；在子镜像构建时默认执行。
 
++ SHELL
+  
+  > 该指令允许覆盖用于命令的 shell 形式的默认*shell*. linux默认为
+  > 
+  > `["/bin/sh", "-c"]` windows默认为`["cmd", "/S", "/C"]`
+  > 
+  >  
+  > 
+  > ```dockerfile
+  > FROM microsoft/nanoserver
+  > SHELL ["powershell","-command"]
+  > RUN New-Item -ItemType Directory C:\Example
+  > ADD Execute-MyCmdlet.ps1 c:\example\
+  > RUN c:\example\Execute-MyCmdlet -sample 'hello world'
+  > ```
+  > 
+  > 
+
 + 小结
   
   暂无