Date: Sat, 19 Feb 2005 14:06:27 -0300 From: Alejandro Pulver <alejandro@varnet.biz> To: Scott Milliken <scott.milliken@e-comsultant.net> Cc: freebsd-questions@freebsd.org Subject: Re: How to handle numeric variables in sh? Message-ID: <20050219140627.44f632b4@ale.varnet.bsd> In-Reply-To: <42175A14.3000402@e-comsultant.net> References: <20050219125559.3bb98715@ale.varnet.bsd> <42175A14.3000402@e-comsultant.net>
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On Sat, 19 Feb 2005 10:24:04 -0500 Scott Milliken <scott.milliken@e-comsultant.net> wrote: > Here's a code snippet of a script I use often to number a bunch of pics > in a directory that I think shows how to do what you want to do: > > $PICNUM=100 > for FNAME in DSC*.JPG > do > NEWNAME=My_Pictures-$PICNUM.jpg > mv $FNAME $NEWNAME > PICNUM=$(($PICNUM+1)) > done > > This works in /bin/sh from my FreeBSD 4.11 system and also bash. If you > want to perform a mathematical operation on a shell variable, just > surround the expression with $(( expr )) and it'll work. > > Hope that helps. > > Scott Milliken > Thank You. Y saw the use of '$(( expr ))' some time ago in 'Advanced Bash Scripting Guide', but I thought it was only for 'bash'. I am using FreeBSD 5.3 and it also works in '/bin/sh'. Best Regards, Ale
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