Comparing Version Numbers Post: 302269331

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Top Forums UNIX for Dummies Questions & Answers Comparing Version Numbers Post 302269331 by jim mcnamara on Wednesday 17th of December 2008 11:43:58 AM

12-17-2008

Registered User

Oh. details like that help a lot.
One way to do this try this for starters-

Code:

#!/bin/ksh
# input versionstring1   versionstring2  example: 10.10.1  10.8.3
# returns 0 if string1 = string2  
#          <0 if string1 < string2 
#           >0  if string1 > string2
# this assumes xx.xx.xx for version number
vercmp()
{
     IFS=.
     echo "$1"  | read a1 b1 c1
     echo "$2"  | read a2 b2 c2
     IFS=" "
     r1=$((a1 - a2))
     r2=$((b1 - b2))
     r3=$((c1 - c2))
     tot=$((r1 + r2 + r3))
     if [ $tot -eq 0 ] ; then
         print 0
         return 0
     fi
     if [[ $r1 -gt 0 || $r2 -gt 0 || $r3 -gt 0 ]] ; then  # changed
         print 1
         return 0
     fi
     retval="-1"        # changed
     echo  "$retval"  # changed

}

#usage:
if [ $(vercmp 10.10.1 10.2.4) -gt -1 ] ; then
       echo "version okay"
else
       echo "version too old"
fi

Last edited by jim mcnamara; 12-17-2008 at 02:03 PM..

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LEARN ABOUT DEBIAN

rscript

Rscript(1)								FSF								Rscript(1)

NAME

       Rscript - front end for scripting with R

SYNOPSIS

       Rscript [--options] [-e expr] file [args]

DESCRIPTION

       A binary front-end to R, for use in scripting applications.

       expr   An optional expression to be evaluated, used in place of expr.

       file   Input file of R expressions

       args   Optional further arguments to be processed by commandArgs in the R interpreter.

OPTIONS

       --options accepted are

       --help Print usage and exit

       --version
	      Print version and exit

       --verbose
	      Print information on progress

       --default-packages=list
	      Where 'list' is a comma-separated set of package names, or 'NULL'

       and also options to R (in addition to --slave --no-restore), such as

       --save Do save workspace at the end of the session

       --no-environ
	      Don't read the site and user environment files

       --no-site-file
	      Don't read the site-wide Rprofile

       --no-init-file
	      Don't read the user R profile

       --restore
	      Do restore previously saved objects at startup

       --vanilla
	      Combine --no-save, --no-restore, --no-site-file --no-init-file and --no-environ

SEE ALSO

       R(1)

R scripting							    April 2007								Rscript(1)

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