脚本如下

#!/bin/bash

# 检查参数数量
if [ "$#" -lt 2 ]; then
    echo "Usage: $0 <hosts_file> <cron_job_file>"
    echo "cron_job_file format: <cron_schedule> <command>"
    exit 1
fi

hosts_file="$1"
cron_job_file="$2"

# 检查文件是否存在
if [ ! -f "$hosts_file" ]; then
    echo "Error: Hosts file does not exist."
    exit 1
fi

if [ ! -f "$cron_job_file" ]; then
    echo "Error: Cron job file does not exist."
    exit 1
fi

# 读取主机文件并添加定时任务
while IFS= read -r host
do
    echo "Adding cron jobs to $host..."
    
    # 读取cron任务并通过heredoc传递给远程主机
    ssh "$host" bash << EOF
        # 创建临时文件
        temp_file=\$(mktemp)

        # 导出当前的 crontab 内容到临时文件
        crontab -l > "\$temp_file" 2>/dev/null

        # 读取并添加新的定时任务
        while IFS= read -r job; do
            if grep -Fq "\$job" "\$temp_file"; then
                echo "The cron job '\$job' already exists on $host. Skipping."
            else
                echo "\$job" >> "\$temp_file"
                echo "Added new cron job: \$job"
            fi
        done << 'CRON_JOBS'
$(cat "$cron_job_file")
CRON_JOBS

        # 更新 crontab
        crontab "\$temp_file"

        # 删除临时文件
        rm "\$temp_file"

        echo "Cron jobs updated successfully on $host."
EOF

    if [ $? -eq 0 ]; then
        echo "Successfully added cron jobs to $host"
    else
        echo "Failed to add cron jobs to $host"
    fi
    echo "-----------------------------------"
done < "$hosts_file"

echo "Batch cron job addition completed."