ksh - help with getting one output

[dusoo]

Hi all, im bit new to unix,
and now im trying to get one output of one varieble in a function (ksh script), but it seems to have problems with pipe character or maybe a space. Could u please give me some advice how to get through this?
thanks


MONITOR()
{
grep_rule=$1
echo "grep_rule=$1"
# in the output i get correctly the string : ./hob status | grep small | wc -l

# now i need to run it, to get the output of it, so i do this
TMP=`"$grep_rule"`
echo $TMP
# now it writes following error:./hob status | grep small | wc -l: No such file or
directory

# if i try the same string without double quotes
TMP=`$grep_rule`
echo $TMP
# i get only output if i would run only ./hob status
#... and that's wierd for me at least
}
GREP_RULE="./hob status | grep small | wc -l"
MONITOR "$GREP_RULE"