Linux Shell learning — bash里自带的浮点计算器

Linux bash calculator 感觉用起来蛮方便，至少是偷懒比较方便，嘻嘻

How to:

1.通过命令行
#scale 表示浮点数的精确位数
[root@www.linuxidc.com ~]# bc
bc 1.06
Copyright 1991-1994, 1997, 1998, 2000 Free Software Foundation, Inc.
This is free software with ABSOLUTELY NO WARRANTY.
For details type `warranty’.
3+4
7
scale=2;3/4
.75

ctrl +d

2.通过计算文档统一进行计算
[root@www.linuxidc.com ~]# vi calc.bc
[root@www.linuxidc.com ~]# cat calc.bc
3+4
scale=2;3/4
[root@www.linuxidc.com ~]# bc calc.bc
bc 1.06
Copyright 1991-1994, 1997, 1998, 2000 Free Software Foundation, Inc.
This is free software with ABSOLUTELY NO WARRANTY.
For details type `warranty’.
7
.75

ctrl +d

3.数制的转换
#ibase  是指输入的数制，obase是指输出的数制
[root@www.linuxidc.com ~]# echo ‘ibase=10;obase=2;11’|bc

1011

Reference:

http://www.linuxidc.com/Linux/2012-01/52386p2.htm