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Full Discussion: Comparing Version Numbers
Top Forums UNIX for Dummies Questions & Answers Comparing Version Numbers Post 302270926 by cero on Tuesday 23rd of December 2008 07:53:07 AM
Old 12-23-2008
I'm not familiar with OS X, but usually version numbers are weighted. That may be the reason for the unrespected results on Tiger.
A script assuming max. 3 digits for any number could look like this:
Code:
#!/bin/ksh
# compare version numbers
# usage: vercmp <versionnr1> <versionnr2>
#         with format for versions xxx.xxx.xxx
# returns: 0 if versionnr1 equal or greater
#          1 if versionnr1 lower
vercmp()
{
        IFS=.
        echo "$1" |read a1 b1 c1
        echo "$2" |read a2 b2 c2
        IFS=" "
        ret=$(((a1 - a2) * 1000000 + (b1 - b2) * 1000 + c1 - c2))
        test $ret -gt -1
        return $?
}

vercmp 9.2.5 10.3.9
echo $?
vercmp 10.3.2 9.1.1
echo $?
vercmp 10.3.2 9.9.9
echo $?
vercmp 10.3.2 10.3.2
echo $?

returns
Quote:
1
0
0
0
 

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LEARN ABOUT SUNOS

noecho

echo(3XCURSES)						  X/Open Curses Library Functions					    echo(3XCURSES)

NAME

       echo, noecho - enable/disable terminal echo

SYNOPSIS

       cc [ flag... ] file... -I /usr/xpg4/include -L /usr/xpg4/lib 
       -R /usr/xpg4/lib -lcurses [ library... ]

       c89 [ flag... ] file... -lcurses [ library... ]

       #include <curses.h>

       int echo(void);

       int noecho(void);

DESCRIPTION

       The  echo()  function enables Echo mode for the current screen. The noecho() function disables Echo mode for the current screen. Initially,
       curses software echo mode is enabled and hardware echo mode of the tty driver is disabled. The echo() and noecho() functions control  soft-
       ware echo only. Hardware echo must remain disabled for the duration of the application, else the behavior is undefined.

RETURN VALUES

       Upon successful completion, these functions return OK. Otherwise, they return ERR.

ERRORS

       No errors are defined.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Unsafe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       getch(3XCURSES), getstr(3XCURSES), initscr(3XCURSES), libcurses(3XCURSES), scanw(3XCURSES), attributes(5), standards(5)

SunOS 5.10							    5 Jun 2002							    echo(3XCURSES)
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