Bash扩展osascript命令中的变量

Question

有没有人能告诉我如何让变量在下面展开：

MESSAGE="Public IP Address has changed"
osascript -e 'tell application (path to frontmost application as text) to display \ 
dialog "My message is ${MESSAGE} " buttons {"OK"} with icon stop'

Answer 1

单引号阻止了变量扩展：3.1.2.2 Single Quotes

MESSAGE="Public IP Address has changed"
osascript -e 'tell application (path to frontmost application as text) to display \ 
dialog "My message is '"$MESSAGE"' " buttons {"OK"} with icon stop'
# ....................^^........^^

我在这里使用shell字符串连接：

• 单引号以结束单引号字符串的第一部分，
• 变量在双引号内展开，
• 单引号以打开单引号字符串的最后一部分。