groupmod 命令 #

groupmod [选项] 组名

groupmod -n new_group_name old_group_name

groupmod -g 1500 group_name

groupmod -g 1500 -o group_name

groupmod -R /mnt/system -n new_group_name old_group_name

#!/bin/bash
# 更新文件所有权以匹配新的GID

old_gid=$1
new_gid=$2

if [ -z "$old_gid" ] || [ -z "$new_gid" ]; then
    echo "Usage: $0 old_gid new_gid"
    exit 1
fi

# 查找属于旧GID的文件
echo "Finding files with GID $old_gid..."
files=$(find / -gid $old_gid 2>/dev/null)

if [ -z "$files" ]; then
    echo "No files found with GID $old_gid"
    exit 0
fi

echo "Found files with GID $old_gid. Updating to GID $new_gid..."
find / -gid $old_gid -exec chgrp $new_gid {} \; 2>/dev/null

echo "File ownership update complete"

#!/bin/bash
# 重命名组并更新相关配置

old_name=$1
new_name=$2

if [ -z "$old_name" ] || [ -z "$new_name" ]; then
    echo "Usage: $0 old_group_name new_group_name"
    exit 1
fi

# 检查旧组是否存在
if ! getent group $old_name > /dev/null; then
    echo "Group $old_name does not exist"
    exit 1
fi

# 检查新组名是否已存在
if getent group $new_name > /dev/null; then
    echo "Group $new_name already exists"
    exit 1
fi

# 重命名组
echo "Renaming group $old_name to $new_name..."
groupmod -n $new_name $old_name

if [ $? -ne 0 ]; then
    echo "Failed to rename group"
    exit 1
fi

echo "Group renamed successfully"

# 更新配置文件中的组名引用
echo "Updating configuration files..."
for config_file in /etc/group /etc/gshadow /etc/passwd /etc/sudoers /etc/security/limits.conf; do
    if [ -f $config_file ]; then
        echo "Checking $config_file..."
        grep -q $old_name $config_file && echo "Found reference in $config_file"
    fi
done

echo "NOTE: You may need to manually update references to the old group name in configuration files"

#!/bin/bash
# 合并两个组（将源组的成员添加到目标组）

source_group=$1
target_group=$2

if [ -z "$source_group" ] || [ -z "$target_group" ]; then
    echo "Usage: $0 source_group target_group"
    exit 1
fi

# 检查两个组是否存在
if ! getent group $source_group > /dev/null; then
    echo "Source group $source_group does not exist"
    exit 1
fi

if ! getent group $target_group > /dev/null; then
    echo "Target group $target_group does not exist"
    exit 1
fi

# 获取源组的成员
members=$(getent group $source_group | cut -d: -f4)

if [ -z "$members" ]; then
    echo "Source group $source_group has no members"
    exit 0
fi

echo "Members of $source_group: $members"
echo "Adding members to $target_group..."

# 将成员添加到目标组
IFS=',' read -ra USERS <<< "$members"
for user in "${USERS[@]}"; do
    if [ -n "$user" ]; then
        usermod -aG $target_group $user
        echo "Added $user to $target_group"
    fi
done

echo "Group merge complete. You may now delete the source group if desired."

#!/bin/bash
# 批量更改组ID范围

start_gid=$1
end_gid=$2
new_start_gid=$3

if [ -z "$start_gid" ] || [ -z "$end_gid" ] || [ -z "$new_start_gid" ]; then
    echo "Usage: $0 start_gid end_gid new_start_gid"
    exit 1
fi

# 检查参数是否为数字
if ! [[ "$start_gid" =~ ^[0-9]+$ ]] || ! [[ "$end_gid" =~ ^[0-9]+$ ]] || ! [[ "$new_start_gid" =~ ^[0-9]+$ ]]; then
    echo "All parameters must be numeric"
    exit 1
fi

# 计算偏移量
offset=$((new_start_gid - start_gid))

# 查找GID在指定范围内的组
groups=$(awk -F: -v start="$start_gid" -v end="$end_gid" '($3 >= start && $3 <= end) {print $1 ":" $3}' /etc/group)

if [ -z "$groups" ]; then
    echo "No groups found in GID range $start_gid-$end_gid"
    exit 0
fi

echo "Found groups in GID range $start_gid-$end_gid:"
echo "$groups"
echo "These groups will be moved to GID range $new_start_gid-$((new_start_gid + end_gid - start_gid))"
read -p "Continue? (y/n): " confirm

if [ "$confirm" != "y" ]; then
    echo "Operation cancelled"
    exit 0
fi

# 更改组ID
echo "$groups" | while IFS=: read -r group gid; do
    new_gid=$((gid + offset))
    echo "Changing GID of $group from $gid to $new_gid"
    groupmod -g $new_gid $group

    # 更新文件所有权
    echo "Updating file ownership..."
    find / -gid $gid -exec chgrp $new_gid {} \; 2>/dev/null
done

echo "GID range change complete"

# 使用sudo运行命令
sudo groupmod -n new_group_name old_group_name