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Full Discussion: floating point shell variable
Top Forums Shell Programming and Scripting floating point shell variable Post 302129804 by drl on Wednesday 1st of August 2007 05:11:45 PM
Old 08-01-2007
Hi.

Good work -- if one tool doesn't work, find another.

For small pieces of arithmetic, you can use bc:
Code:
#!/bin/sh

# @(#) s1       Demonstrate floating point arithmetic with bc.

set -o nounset
echo
echo "GNU bash $BASH_VERSION" >&2
bc --version | head -1 >&2
echo

echo 'scale=3 ; 10.345 - 10.305' |
bc

exit 0

which produces:
Code:
% ./s1

GNU bash 2.05b.0(1)-release
bc 1.06

.040

See man bc (and relative dc) for details ... cheers, drl
 

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LEARN ABOUT SUSE

echo

ECHO(1) 							   User Commands							   ECHO(1)

NAME

       echo - display a line of text

SYNOPSIS

       echo [SHORT-OPTION]... [STRING]...
       echo LONG-OPTION

DESCRIPTION

       Echo the STRING(s) to standard output.

       -n     do not output the trailing newline

       -e     enable interpretation of backslash escapes

       -E     disable interpretation of backslash escapes (default)

       --help display this help and exit

       --version
	      output version information and exit

       If -e is in effect, the following sequences are recognized:

       NNN  the character whose ASCII code is NNN (octal)

       \     backslash

       a     alert (BEL)

            backspace

       c     produce no further output

       f     form feed

       
     new line

       
     carriage return

       	     horizontal tab

       v     vertical tab

       NOTE: your shell may have its own version of echo, which usually supersedes the version described here.	Please refer to your shell's docu-
       mentation for details about the options it supports.

AUTHOR

       Written by Brian Fox and Chet Ramey.

REPORTING BUGS

       Report echo bugs to bug-coreutils@gnu.org
       GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
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SEE ALSO

       The full documentation for echo is maintained as a Texinfo manual.  If the info and echo programs are properly installed at your site,  the
       command

	      info coreutils 'echo invocation'

       should give you access to the complete manual.

GNU coreutils 7.1						     July 2010								   ECHO(1)
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