There is no special function or syntax for calling an external command. Taking advantage of the Regina utility rxqueue, which puts output onto the Rexx stack, we can write a "numbered ls" utility as

没有特定的函数或语法用于调用外部命令。

youdao

Functions, external routines, and the stack.

函数、外部例程和堆栈。

youdao

Multiple devices can be connected in series through an interface that sends data up and down the battery stack without external level shifters or isolators.

多个器件可以通过一个接口串联连接，该接口无需外部电平移位器或隔离器，就可沿着电池组来回发送数据。

youdao

Corporate governance and IT security leaders will need to consider the commercial benefits of a hybrid IT stack that is comprised of both internal and external services, versus any perceived or real risk.

FORBES: Does IT Still Matter?