On Wed, Aug 31, 2005 at 01:42:05PM -0500, Dan Nelson wrote: > In the last episode (Aug 31), Gary Kline said: > > I can grab the results of "w=$date+%U)"; in C an use the modulo > > operator; is there a way to do this is /bin/sh? ot zsh? > > > > #/bin/sh > > w=$(date +%U) > > echo "w is $w"; > > (even=$(w % 2 )); ## flubs. > > echo "even is $even"; ## flubs. > > > > if [ $even -eq 0 ] ## flubs, obv'ly. > > then > > echo "week is even"; > > else > > echo "week is odd"; > > fi > > For the simple even/odd case, you can AND with 1: > > even=$(( w & 1 )) > > For the general case: > > xmodn=$(( x - ((x / n) * n) ))
I didn't think of the first cast, but yep; the general is seriously sharp in my book; got to salt this away:-) Thanks. > > which works since sh's arithmetic evaluator is integer-only. > > zsh has the % modulo operator, so xmod=$(( x % n )) . > I knew ksh/zsh/bash(?) have it; forgot about `expr`, tho. gary -- Gary Kline [EMAIL PROTECTED] www.thought.org Public service Unix _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"