linux删除postgres用户和组 linux怎么删除用户和组

 删除账号或用户组我们一般会用到deluser、addgroup命令，这两个命令比userdel和groupdel更好用一些，一般有以下三种用法：
删除一个普通账号

deluser 后接账号名

你甚至可以删除root账号，使用—force参数，如果有权限的话

删除一个用户组deluser –group 后接用户组名

或 delgroup 后接用户组名

 注意，如果该用户组是一个仍然存在的账号的初始用户组的话，这样并不能删除该用户组。另一种情况是，该用户组中还存在一些其他成员，但并不是这些成员的初始用户组，那么为了避免这个用户组被误删除，我们可以使用—only-if-empty参数。

从用户组内删除账号

deluser 账号 用户组

deluser、delgroup命令还有以下部分常用参数：

–conf后接文件名，以替换/etc/deluser.conf(这个配置文件后面详细说明)

–groupdeluser命令使用这个参数时，相当于delgroup命令

–quiet安静模式

–system仅删除系统账号或用户组，用来避免意外删除非系统账号或用户组的

–only-if-empty只有用户组内没有任何成员，才删除该用户组

–backup在删除前备份该账号家目录及邮件目录到根目录下，备份文件常命名为/$user.tar.bz2或/$user.tar.gz

–backup-to指定备份该账号家目录及邮件目录的地址，使用这个参数相当于也使用了—backup参数

–remove-home删除该账号的家目录及邮件目录

–remove-all-files删除系统内所有属于该账号的文件，范围大于—remove-home
/etc/deluser.conf

 deluser及delgroup命令删除账号的设置文件就是这个，文件的内容如下：

1代表是，0代表否

第4行，是否删除账号家目录

第7行，是否删除系统内所有属于该账号的文件

第11行，是否备份账号的家目录及邮件目录

第14行，备份地址（图中表示当前目录）

第17行，如果一个用户组内仍然有成员，是否删除该用户组

第20行，备份该账号文件时，需要排除的文件类型

附一个删除账号的脚本用例

#!/bin/bash

function get_answer()
{
        unset ANSWER
        ASK_COUNT=0
        while [ -z "$ANSWER" ]
        do
                ASK_COUNT=$[ $ASK_COUNT+1 ]
                case $ASK_COUNT in
                2)
                        echo
                        echo "Please answer the question."
                        echo
                        ;;
                3)
                        echo
                        echo "One last try...please answer the question."
                        echo
                        ;;
                4)
                        echo
                        echo "Since you refuse to answer the question..."
                        echo "Exiting program."
                        echo
                        exit
                        ;;
                esac
                if [ -n "$LINE2" ]
                then
                        echo "$LINE1"
                        echo -e $LINE2" \c"
                else
                        echo -e $LINE1" \c"
                fi
                read -t 60 ANSWER
        done
        unset LINE1
        unset LINE2
}

function process_answer()
{
        case $ANSWER in
        y|Y|YES|yes|Yes|yEs|yeS|YEs|yES)
                ;;
        *)
                echo
                echo $EXIT_LINE1
                echo $EXIT_LINE2
                echo
                exit
                ;;
        esac
        unset EXIT_LINE1
        unset EXIT_LINE2
}
echo "Step #1 - Determine user account name to delete."
echo

LINE1="Please enter the username of the user "
LINE2="account you wish to delete fron the system:"
get_answer
USER_ACCOUNT=$ANSWER

LINE1="Is $USER_ACCOUNT the user account "
LINE2="you wish to delete fron the system? [Y/N]"
get_answer

EXIT_LINE1="Because the account, $USER_ACCOUNT is not "
EXIT_LINE2="the one you wish to delete, we are leaving the scrit..."
process_answer


USER_ACCOUNT_RECORD=`cat /etc/passwd|grep -w $USER_ACCOUNT`
if [ $? -eq 1 ]
then
        echo
        echo "Account,$USER_ACCOUNT,not found. "
        echo "Leaving the script."
        echo
        exit
fi

echo "I found the record: $USER_ACCOUNT_RECORD"
echo
LINE1="Is this the correct  User Account? [y/n]"
get_answer

EXIT_LINE1="Because the account,$USER_ACCOUNT is not "
EXIT_LINE2="the one you wish to delete, wo are leaving the script..."
process_answer

echo "Step #2 - find processes on system belonging to user account."
echo

ps -u $USER_ACCOUNT >/dev/null
case $? in
1)
        echo "There are no processes for this account currently running."
        echo
        ;;
0)
        echo "$USER_ACCOUNT has the following processes running: "
        echo
        ps -u $USER_ACCOUNT

        LINE1="Would you like me to kill the processer? [y/n]"
        get_answer
        case $ANSWER in
        y|Y|YES|yes|Yes|yEs|yeS|YEs|yES)
                COMMAND_1="ps -u $USER_ACCOUNT  --no-heading"
                COMMAND_3="xargs -d \\n /usr/bin/sudo /bin/kill -9"
                echo
                echo "Killing off the processes..."
                $COMMAND_1|gawk '{print $1}'|$COMMAND_3
                echo
                echo "Processed killed."
                ;;
        *)
                echo
                echo "Will not kill the processes."
                echo
                exit
                ;;
        esac
        ;;
esac

echo "Step #3 - find files on system belonging to user account."
echo
echo "Creating a report of all files owned by $USER_ACCOUNT."
echo
echo "It is recommended that you backup/archive these files, "
echo "and then do one of two things:"
echo " 1) delete the files."
echo " 2) chang the files'ownership to a current user account."
echo
echo "Please wait, this may take a while..."
REPORT_DATE=$(date +%y%m%d)
REPORT_FILE=$USER_ACOUNT"_Files_"$REPORT_DATE".rpt"

find / -user $USER_ACCOUNT > $REPORT_FILE 2>/dev/null
echo
echo "Report is complete."
echo "Name of report : $REPORT_FILE."
echo "Location of report: `pwd`"
echo

echo
echo "Step #4 - remove user account"

LINE1="Remove $USER_ACCOUNT's account from system? [y/n]"
get_answer

EXIT_LINE1="Since you do not wish to remove the user account "
EXIT_LINE2="$USER_ACCOUNT at this time, exiting the script..."
process_answer

userdel $USER_ACCOUNT

echo
echo "User account $USER_ACCOUNT has been removed."
echo
exit