Usage of BC

bc

Linux The calculator under

Common options ：
-i： Force into interactive mode ;
-l： Define the standard math library to use
-q： Don't print normal GNU bc environmental information ;
usage ：

1. Command line

root@ubuntu:~# bc
bc 1.07.1
Copyright 1991-1994, 1997, 1998, 2000, 2004, 2006, 2008, 2012-2017 Free Software Foundation, Inc.
This is free software with ABSOLUTELY NO WARRANTY.
For details type `warranty'. 
10/3
3
scale
0

scale=5

scale
5
10/3
3.33333
quit
root@ubuntu:~# 

2. echo The Conduit

root@ubuntu:~# echo "2^8" |bc
256
root@ubuntu:~# echo "ibase=2;11111111" |bc
255
root@ubuntu:~# echo "scale=3;10/3" |bc
3.333
root@ubuntu:~# echo "scale=3;num=10/3;if(length(num)==scale(num)) print 0;print num" |bc |xargs echo
3.333
root@ubuntu:~# echo "scale=3;num=1/3;if(length(num)==scale(num)) print 0;print num" |bc |xargs echo 
0.333

3. Hexadecimal conversion
   ibase Enter a decimal number
   obase Output digit base

root@ubuntu:~# echo "obase=8;10" |bc
12
root@ubuntu:~# echo "ibase=2;11011" |bc
27
root@ubuntu:~# echo "ibase=2;11111" |bc
31
root@ubuntu:~# echo "ibase=10;obase=16;12" |bc
C
root@ubuntu:~# echo "ibase=10;obase=8;7" |bc
7
root@ubuntu:~# echo "ibase=10;obase=2;12" |bc
1100
root@ubuntu:~# echo "ibase=2;obase=8;110101" |bc
65
root@ubuntu:~# echo "ibase=8;obase=16;14357" |bc
247D