Question

我对文件系统的访问权限有限，我想设置通用通知处理程序调用：

notificator.sh "apples" "oranges" "There were $(1) and $(2) in the basket"

notificator.sh内容：

#!/bin/sh
echo $3

输出如下：

"There were apples and oranges in the basket"

有可能吗？我更喜欢它是否是内置的解决方案。我实际上是尝试通过curl post param将结果字符串（$ 3）作为消息发送到电报机器人，但是试图简化这种情况。

Answer 1

对$3进行一些更改后，我们可以轻松完成此工作。

首先，让我们定义$1，$2和$3：

$ set -- "apples" "oranges" 'There were ${one} and ${two} in the basket'

现在，让我们强行替换$3：

$ one=$1 two=$2 envsubst <<<"$3"
There were apples and oranges in the basket

注意：

$(1)尝试运行名为1的命令，甚至可能在脚本运行之前生成错误。请改用${var}。
要使此方法有效，我们需要在$3中重命名变量。
envsubst是GNU gettext-base包的一部分，默认情况下应该可用于Linux发行版。

帽子提示Charles Duffy。

以脚本形式

考虑这个脚本：

$ cat script.sh
#!/bin/sh
echo "$3" | one=$1 two=$2 envsubst

我们可以执行以上内容：

$ sh script.sh "apples" "oranges" 'There were ${one} and ${two} in the basket'
There were apples and oranges in the basket

作为替代方案（再次提到Charles Duffy），我们可以使用here-doc：

$ cat script2.sh
#!/bin/sh
one=$1 two=$2 envsubst <<EOF
$3
EOF

运行此版本：

$ sh script2.sh "apples" "oranges" 'There were ${one} and ${two} in the basket'
There were apples and oranges in the basket

替代

以下脚本不需要envsubst：

$ cat script3.sh
#!/bin/sh
echo "$3" | awk '{gsub(/\$\{1\}/, a); gsub(/\$\{2\}/, b)} 1' a=$1 b=$2

使用我们的参数运行此脚本，我们发现：

$ sh script3.sh "apples" "oranges" 'There were ${1} and ${2} in the basket'
There were apples and oranges in the basket
$ sh script3.sh "apples" "oranges" 'There were ${1} and ${2} in the basket'
There were apples and oranges in the basket

如何插入作为参数发送的字符串？

1 个答案:

以脚本形式

替代