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Full Discussion: Csh arithmetic not producing the expected value
Top Forums Shell Programming and Scripting Csh arithmetic not producing the expected value Post 302882030 by DGPickett on Friday 3rd of January 2014 04:21:18 PM
Old 01-03-2014
It seems to evaluate right to left, a - b - c is push c, negate, add b, negate, add a. Yes, it is ugly. Use parens. I installed tcsh just to try:
Code:
$ tcsh -c '@ a = 61
@ b = 43
@ c = 4
@ tot = $a - $b - $c
echo $tot'
14
$ tcsh -c '
@ count = 43
@ total_count = 61
@ failing = 4
@ no_finish = 0
echo "Total Count:$total_count  Finished:$count  Failed:$failing  $total_count-$count-$failing"
@ no_finish   = $total_count - $count - $failing
echo $no_finish
echo "Total Count:$total_count  Finished:$count  Failed:$failing  $total_count-$count-$failing"
@ no_finish  = $total_count - ( $count + $failing )
echo $no_finish
echo "Total Count:$total_count  Finished:$count  Failed:$failing  $total_count-$count-$failing"
@ no_finish  = ( $total_count - $count - $failing )
echo $no_finish
echo "Total Count:$total_count  Finished:$count  Failed:$failing  $total_count-$count-$failing"
@ no_finish  = ( $total_count - $count ) - $failing
echo $no_finish
'
Total Count:61  Finished:43  Failed:4  61-43-4
14
Total Count:61  Finished:43  Failed:4  61-43-4
14
Total Count:61  Finished:43  Failed:4  61-43-4
14
Total Count:61  Finished:43  Failed:4  61-43-4
14
$ tcsh --version
tcsh 6.17.06 (Astron) 2011-04-15 (x86_64-unknown-linux) options wide,nls,dl,al,kan,rh,nd,color,filec
$

Some called it a documented feature, but I think that is a stretch: http://www.linuxmisc.com/12-unix-she...bdc36b511c.htm
Last edited by DGPickett; 01-03-2014 at 06:07 PM..
 

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