Linux in a Nutshell, Fifth Edition

bison | 63

Linux

Commands

This is the Title of the Book, eMatter Edition

Copyright © 2006 O’Reilly & Associates, Inc. All rights reserved.

Examples

Note in these examples that when you type some quantity (a

number or expression), it is evaluated and printed, but assignment

statements produce no display.

ibase = 8 Octal input

20 Evaluate this octal number

16 Terminal displays decimal value

obase = 2 Display output in base 2 instead of base 10

20 Octal input

10000 Terminal now displays binary value

ibase = A Restore base-10 input

scale = 3 Truncate results to 3 decimal places

8/7 Evaluate a division

1.001001000 Oops! Forgot to reset output base to 10

obase = 10 Input is decimal now, so A isn't needed

8/7

1.142 Terminal displays result (truncated)

The following lines show the use of functions:

define p(r,n){ Function p uses two arguments

auto v v is a local variable

v = r^n r raised to the n power

return(v)} Value returned

scale = 5

x = p(2.5,2) x = 2.5 ^ 2

x Print value of x

6.25

length(x) Number of digits

3

scale(x) Number of places right of decimal point

2

biff

biff [arguments]

Notify user of mail arrival and sender’s name. biff operates asyn-

chronously. Mail notification works only if your system is running

the comsat(8) server. The command biff y enables notification, and

the command biff n disables notification. With no arguments, biff

reports biff’s current status.

bison

bison [options] file

Given a file containing ...