linux shell learning -- bash裏自帶的浮點計算器

linux bash calculator 感覺用起來蠻方便，至少是偷懶比較方便，嘻嘻

How to:

1.通過命令行
#scale 表示浮點數的精確位數
[root@HOSTNAME ~]# 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.通過計算文檔統一進行計算
[root@HOSTNAME ~]# vi calc.bc
[root@HOSTNAME ~]# cat calc.bc
3+4
scale=2;3/4
[root@HOSTNAME ~]# 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.數制的轉換
#ibase  是指輸入的數制，obase是指輸出的數制
[root@HOSTNAME ~]# echo 'ibase=10;obase=2;11'|bc

1011

Reference:

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

https://writer.zoho.com/public/6b6a49b6dcbb8205336873dd09e1b3517a451cd1e1176acb0d0771c7b061b3176db04614eed231e5