how to check if a user exists in a group linux code example
Example 1: bash if user exists in a group then add
egrep -i "^groupname" /etc/group;
if [ $? -eq 0 ]; then
echo "Group Exists"
else
echo "Group does not exist -- Invalid Group name"
fi
Example 2: bash if user exists in a group then add
#!/bin/bash
# init
USERID="$1"
#....
/bin/egrep -i "^${USERID}:" /etc/passwd
if [ $? -eq 0 ]; then
echo "User $USERID exists in /etc/passwd"
else
echo "User $USERID does not exists in /etc/passwd"
fi
# ....