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You'll need to change things a wee bit.

First, I think, you'll need egrep if you are going to use 'pattern|pattern'. At least my version of grep won't do this, but egrep will.

Second, your...

Try:
if grep -wq "$D" testfile
then
echo $D exists
else
echo $D doesnt exist
fi

Try something like this:


if grep -q "$D" testfile
then
echo "there"
else
echo "not there"
fi


You don't need to cat to grep; grep will read the file. You also don't want to test...

the single-quotations don't allow for expansion. but then you also need in-place editing:

sed -i "/$USER/d" /etc/sudoers

or better

sed -i.bak

so that it saves the backup

Try this line instead as the --md5 is being mistaken for a command line and the quotes may help too.

if grep -Fxq -- "$GRUBPASSWD" /etc/grub.conf