Bash script create user

Question

我正在尝试创建一个bash脚本在Ubuntu中创建用户。如果用户存在，那么它应该要求输入一个不存在的用户名。

我也想创建组。我希望你们能帮助我!

if [ $(id -u) -eq 0 ]; then
read -p "Please enter a username: " username
# Check if user exist or not
egrep "^$username" /etc/passwd >/dev/null
while [ $? -eq 0 ]; do
read -p "User $username already exist! Please enter a different username: " username
exit 1
done
groupadd -f "${group}"
useradd -m -g "${group}" "${username}"
[ $? -eq 0 ] && echo "User added to system!" || echo "Could not create user!"
else
echo "Only root may add a user to the system."
exit 2
fi

Answer 1

像这样:

if ((UID!=0)); then
echo >&2 "Only root may add a user to the system."
exit 2
fi
read -p "Please enter a username: " username
# Check if user exist or not
if id "$username" &>/dev/null; then
echo >&2 "User $username already exist"
exit 1
fi
groupadd -f "$group"
if useradd -m -g "$group" "$username"; then
echo "User added to system!"
else
echo >&2 "Could not create user!"
exit 1
fi