Regexp dynamic variable - regex

Question

I have a crontab file named mycronfile:
#30 07 03 09 RAB root bash /media/data/test1.sh
#* * * * * root bash /media/data/test2.sh
30 07 * * * root bash /media/data/test3.sh
I am trying to add new lines to it but only if they don't already exist. This my code :
while read $line; do
com1=$(echo $line | awk '{ print $8 }')
com2=$(echo $line | awk '{ print $7 }')
fullCom=$(echo "$com2 $com1")
fixMin=$(echo $line | awk '{ print $1 }')
fixHour=$(echo $line | awk '{ print $2 }')
fixDate=$(echo $line | awk '{ print $3 }')
fixMonth=$(echo $line | awk '{ print $4 }')
actv=`echo "$fixMin $fixHour $fixDate $fixMonth $fixDay $user $fullCom"`
if grep "$actv" tempcron; then
echo "data in tempcron exist"
echo "$actv" > /dev/null
else
echo "data input into file"
echo "$actv >> tempcron"
fi
done < myfilecron
Every time I execute the script, data in tempcron is always duplicated. Of course I need to grep from mycronfile with the right pattern to avoid duplication. But how to grep it with regular expression? Because problem come when line contain asterisk (*).

Answer 1

A rewrite:
while read min hr date mon day user cmd; do
actv="$min $hr $date $mon $day $user $cmd" # only purpose I can see here
# is to fix the spaces
if grep -Fq "$actv" tempcron; then
echo "data in tempcron exist"
else
echo "data input into file"
echo "$actv >> tempcron"
fi
done < myfilecron
The main problem is that the $actv string contains * characters, which are regular expression quantifiers. You weren't telling grep to search for a plain string, you were giving a regex pattern that didn't match.
The other big problem with your script: while read $line -- you give read one or more variable names not a variable values