Write the difference between $$ and $!?

Write the difference between $$ and $!?

题目类型: 技术面试题

这是一道技术面试题，常见于澳洲IT公司面试中。

难度: hard

标签: interviewbit, shell-scripting, topic-specific, shell, linux, scripting

参考答案摘要

You can use $$ to get the process id of the current process. However, $! displays the process id for a background process that recently went away.

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