Question

我希望有人可以帮助我进行一些文字操作，这不是我的强项，而是在尝试替换文件中的文字时遇到问题。

我有一个Terraform文件，我想要做的是运行一个BASH脚本，它收集用户输入并填写Terraform文件。格式如下：

Terraform.tf

throw

Provisioner.sh

variable "master_cpu" {default = }
variable "master_mem" {default = }
variable "master_count" {default = }
variable "master_template" {default = ""}
variable "master_datastore" {default = ""}
variable "master_secondary_disk_size" {default = }
variable "master_network_label" {default = ""}
variable "master_gateway" {default = ""}
variable "master_netmask" {default = ""}

这里有两个问题，第一个是数字不是用双引号括起来但文字是，所以只需在Terraform中搜索 default =＆＃34;＆＃34; 文件是没用的。

我遇到的另一个问题是变量没有扩展，例如：

echo -n "How many vCPU's should these VM's have? [ENTER]:"
read master_cpu
echo -n "How much RAM would you like to allocate? [ENTER]:"
read master_ram
echo -n "Template name? Format: Folder/template [ENTER]:"
read master_template
echo -n "Please provide the datastore name. [ENTER]:"
read master_dstore
...

将产生：default =＆＃34; $ vc_address＆＃34;而不是使用命令行上捕获的IP。

如果有人能给我一些关于如何在BASH中有效地做到这一点的指示，对于数字和文字，我真的很感激。

Answer 1

你想要的是一个模板引擎，这可以使用bash here-doc：

来实现

#!/bin/bash
echo -n "How many vCPU's should these VM's have? [ENTER]:"
read master_cpu
echo -n "How much RAM would you like to allocate? [ENTER]:"
read master_ram
echo -n "Template name? Format: Folder/template [ENTER]:"
read master_template
echo -n "Please provide the datastore name. [ENTER]:"
read master_dstore

# Use heredoc to generate the file, use EOF and not "EOF" since we want bash substitution
cat > Terraform.tf << EOF
variable "master_cpu" {default = $master_cpu}
variable "master_mem" {default = $master_ram}
variable "master_count" {default = }
variable "master_template" {default = ""}
variable "master_datastore" {default = ""}
variable "master_secondary_disk_size" {default = }
variable "master_network_label" {default = ""}
variable "master_gateway" {default = ""}
variable "master_netmask" {default = ""}
EOF

您可以在此处详细了解heredoc：http://tldp.org/LDP/abs/html/here-docs.html

对于不扩展的变量，bash中的'和'之间存在差异。基本上'表示文字（不扩展）。请参阅bash手册：

用户输入替换BASH中的变量

1 个答案: