1 #!/bin/bash
 2 a=38
 3 b=99
 4 
 5 percent_1=$(printf "%d%%" $((a*100/b)))
 6 # 或者
 7 percent_2=`awk 'BEGIN{printf "%.1f%%\n",('$a'/'$b')*100}'`
 8 # 保留1位小数,四舍五入
 9 echo $percent_1
10 echo $percent_2

结果为:

1 percent_1=38%
2 percent_2=38.4%