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Do not post classroom or homework problems in the main forums. Homework and coursework questions can only be posted in this forum (https://www.unix.com/homework-coursework-questions/) under special...

Is this homework?

@ping2, please start a new thread for your question next time rather than post it in an existing thread! Thanks.

Regarding your question you can try this:
if (( $a % 5 == 0 ))
then
echo "$a...

Are you trying to see if a group already exists? If so, try this:

read -p "enter group name: " group
if grep -q $group /etc/group
then
echo "group exits"
else
echo "group not exits"...

You have a syntax error. The double semicolons are not needed at the end of your fi

I also don't know about your version of id, but the one installed on my version of linux accepts a -g option,...