shell programming question: help with expr command
dino_vliet at yahoo.com
Sat Apr 9 13:43:49 UTC 2011
I'm having trouble with a little shell script. Can somebody explain me why I get 3 times "expr: syntax error" in my console after I run this little script?
var1="trees.J48" #other value will be rules.Jrip, rules.DecisionTable
ind=`expr index $var1 s`
pos=`expr $len - $ind`
out=`expr substr $var1 $ind $pos`
I would expect (and want the following to happen):
$ind should contain 6
$pos should contain 3
$out should contain J48 (other values will have to be Jrip,DecisionTable)
Can anyone help me with this?
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