From d6e0a6453d75298524ff75a96973e11c2e5ab4d4 Mon Sep 17 00:00:00 2001
From: "rick.chan" <chenyang@autoai.com>
Date: Mon, 21 Dec 2020 14:08:24 +0800
Subject: [PATCH] =?UTF-8?q?=E5=A2=9E=E5=8A=A0=20Golang=20=E6=89=A7?=
 =?UTF-8?q?=E8=A1=8C=E5=A4=96=E9=83=A8=E7=A8=8B=E5=BA=8F.?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: rick.chan <chenyang@autoai.com>
---
 .../Go/Package/OS/Exec/Golang_执行外部程序.md | 30 +++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 Software/Development/Language/Go/Package/OS/Exec/Golang_执行外部程序.md

diff --git a/Software/Development/Language/Go/Package/OS/Exec/Golang_执行外部程序.md b/Software/Development/Language/Go/Package/OS/Exec/Golang_执行外部程序.md
new file mode 100644
index 0000000..84ae8a1
--- /dev/null
+++ b/Software/Development/Language/Go/Package/OS/Exec/Golang_执行外部程序.md
@@ -0,0 +1,30 @@
+# Golang 执行外部程序
+
+需要使用 os/exec 包。
+
+示例如下：
+
+```go
+func MakeCmd(name string, arg ...string) *exec.Cmd {
+    cmd := exec.Command(name, arg...)
+    cmd.Env = append(cmd.Env, "USER=root")
+    cmd.Env = append(cmd.Env, "HOME=/home/root")
+    cmd.Env = append(cmd.Env, "SHELL=/bin/sh")
+    cmd.Env = append(cmd.Env, "LOGNAME=root")
+    cmd.Env = append(cmd.Env, "PATH=/usr/local/bin:/usr/bin:/bin:/xt/scripts:/usr/local/sbin:/usr/sbin:/sbin:/xt/scripts")
+    return cmd
+}
+
+func main() {
+    cmd := MakeCmd("ls", "-l", "/")
+    output, _ := cmd.Output()
+    fmt.Println(output)
+}
+```
+
+exec.Cmd 有 Start、Wait、Run、Output 等方法，其中
+
+* Start：非阻塞执行；
+* Wait：阻塞进程，等待命令执行结束, 经常与 Star 配合使用；
+* Run：阻塞进程，直到命令执行结束，相当于 Start+Wait 的组合；
+* Output：阻塞进程，直到命令执行结束，比 Run 方法多返回程序的 stdout。