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。
As input a sentence, if the sentence is lawful sentence corresponding output syntax tree to the output of the process every step of the sign changes in the stack.
如输入一个句子，如果该句子合法则输出与句子对应的语法树；能够输出分析过程中每一步符号栈的变化情况。
As input a sentence, if the sentence is lawful sentence corresponding output syntax tree to the output of the process every step of the sign changes in the stack.
如输入一个句子，如果该句子合法则输出与句子对应的语法树；能够输出分析过程中每一步符号栈的变化情况。
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