#!/usr/bin/env bash
##计算##
result=`expr 2 - 100`
echo "$result"
result1=$((5+5))
echo "$result1"
result2=$[5+4]
echo $result2
let result3=2+4
echo $result3for var in 1 2 3 4 5 6 7 8 9
do
echo "then is number is $var"
done
for var1 in {10..19}
do
echo "then is number is $var1"
done
for var2 in `seq 20 28`
do
echo "then is numver is $var2"
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