linux operator practical operation _shell

1. "$ ((Expression))" or "[expression]"

2.expr m + n

  Note: expr operators have spaces

3.expr m - n

4.expr \ *, /, /% multiplication, division, modulo

Applications:

Calcd 1. (3 + 2) * 4

After running

After running

 

 

 

 2. The obtained two arguments

After running

 

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Origin www.cnblogs.com/wangdianchao/p/11628274.html