Bash:命令在子 shell 中用花括号分组

Question

当我尝试这样的事情时:

( echo && { echo ; echo } )

我得到:

-bash: syntax error near unexpected token `)'

我确信我需要使用 subshel​​l。而且我确定我需要在其中进行分组。那么如何避免语法错误呢？提前致谢!

Answer 1

命令列表必须以 ; 或换行符结束。

而是说:

( echo && { echo ; echo ; } )
                       ^^^
                        |======= Add this

来自 info bash:

   { list; }
          list  is simply executed in the current shell environment.  list
          must be terminated with a newline or semicolon.  This  is  known
          as  a  group  command. ...