Linux系统没有groupadd命令怎么办

Linux系统没有groupadd命令，也不能联网安装，怎么办？自己动手，丰衣足食，通过一个shell脚本搞定

脚本groupadd

#!/bin/bash
# vim:sw=4:ts=4:et
<<INFO
SCRIPYT:groupadd
AUTHOR:运维@小兵
DATE:2020-12-06
DESCRIBE:创建组
SYSTEM:CentOS7/RedHat7
MODIFY:
INFO

set -e

Log(){
    local log_level=$1
    local log_info=$2
    local script_name=$(basename $0)

    case ${log_level} in
    "INFO")
        echo -e "\033[32m$(date "+%Y-%m-%d %T.%N") [INFO]: ${log_info}\033[0m";;
    "WARN")
        echo -e "\033[33m$(date "+%Y-%m-%d %T.%N") [WARN]: ${log_info}\033[0m";;
    "ERROR")
        echo -e "\033[31m$(date "+%Y-%m-%d %T.%N") [ERROR ${script_name} ${FUNCNAME[1]}]: ${log_info}\033[0m";;
    *)
        echo -e "${@}"
    ;;
    esac
}

[ "$#" -ne 1 ] && Log ERROR "Param Error,eg:sudo groupadd 组名" && exit 1
GROUP_NAME=$1
while :
do
    GID=`echo $(($RANDOM%20000+10000))`         #GID范围10000~30000
    if grep -q "^${GROUP_NAME}:" /etc/group;then
        Log ERROR "${GROUP_NAME} Is Exist!!!" && exit 1
    elif ! grep -q ":${GID}:" /etc/group;then
        Log INFO "Create Group ${GROUP_NAME}"
        [ ! -f "/etc/group.bak" ] && sudo cp /etc/group{,.bak}
        sed -i "\$a ${GROUP_NAME}:x:${GID}:" /etc/group
        exit 0
    fi
done
set +e

使用

chmod +x groupadd
cp groupadd /usr/local/bin/
grouadd t2