Date: Thu, 14 Aug 2003 11:53:13 -0500 From: Stephen Hilton <nospam@hiltonbsd.com> To: "Charles Howse" <chowse@charter.net> Cc: freebsd-questions@freebsd.org Subject: Re: Using bc in bash script Message-ID: <20030814115313.2707cb21.nospam@hiltonbsd.com> In-Reply-To: <001a01c3627e$487d7a10$04fea8c0@moe> References: <20030814154920.GA74582@users.munk.nu> <001a01c3627e$487d7a10$04fea8c0@moe>
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On Thu, 14 Aug 2003 11:08:21 -0500 "Charles Howse" <chowse@charter.net> wrote: > > On Thu, Aug 14, 2003 at 10:46:45AM -0500, Charles Howse wrote: > > > Hello List, > > > > > > I've migrated from Redhat Linux 9 to FreeBSD 4.8-RELEASE, > > character mode > > > - no gui. > > > > > > I'm trying to calculate the number of seconds between > > $start_time and > > > $end_time in a bash script. > > > > > > Start_time=`date +%s` # Seconds past midnight at start of script > > > [ do lots of stuff ] > > > End_time=`date +%s` # Seconds past midnight at end of script > > > > > > Then I want to: et=`bc $end_time - $start_time` to get the number of > > > seconds or fractions of seconds elapsed. > > How about: > > > > et=`echo "$end_time - $start_time" | bc` > > Hi Jez, thanks for the reply! > > As my daughter would say, "Well, DUHHHHHHH!" > That worked fine, it reported 0 seconds. > Can I refine it to give me something like: .784 seconds? Charles, This will set bc precision to 5 decimal places: et=`echo "scale=5 ; $end_time - $start_time" | bc` Regards, Stephen Hilton nospam@hiltonbsd.com
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