The test of the shell face of ER

1. Write a shell procedure named Xunhuan (with a looping statement), as shown in the results of the operation.
0
10
210
3210
43210
543210
6543210
76543210
876543210



2. Write a shell process called Cala, which functions as a small calculator that allows you to add, subtract, multiply, and divide two numbers. The two operands and operators are given by the positional parameters (the positional parameters 1 and 3 are two operands respectively, the positional parameter 2 is the operator), and the four run results are appended to the Cal file.

A: a=""; forIinch' Seq0 8`; DoA=$i $ A; Echo $A; done two: for((i=0;i<9; i++))     Doa=$i $ A echo $a done three: #!/bin/Bash N=9     for((i=0; i<= $N; i++ ))     Do       for(j= $i; j>=0; j-- ))       DoEcho-n $j done Echo done

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The test of the shell face of ER