bash+for+file+in+path

bash中的for循环结构可以用来遍历指定路径下的文件。具体的语法是：

for file in path/*
do
    # 在这里可以对$file进行操作
done

其中，`file`是一个变量，用于存储每次循环中的文件名。`path/*`表示要遍历的路径，`*`通配符表示匹配该路径下的所有文件。

在循环体内，你可以对`$file`进行任何你需要的操作，比如打印文件名、复制文件等等。

相关问题

[1] 20752 -bash: $: command not found [1]+ Exit 127 $ sudo mysqld_safe --init-file=/path/to/mysql-init

This error message indicates that the command prompt is trying to execute a command that begins with a "$" symbol, which is not a valid command. It is possible that the "$" symbol was accidentally included in the command when it was entered.

The second part of the error message indicates that the command "sudo mysqld_safe --init-file=/path/to/mysql-init" was executed but exited with an error code of 127. This could be due to a variety of reasons, such as a missing or incorrect file path, insufficient permissions, or an issue with the MySQL server itself.

To resolve this issue, try removing the "$" symbol from the beginning of the command, ensuring that the file path specified in the "--init-file" option is correct, and checking that the user executing the command has sufficient permissions to run it. Additionally, you may want to check the MySQL server logs for any error messages that could provide more information about the issue.

redis双主+keeplived，其中keeplived的脚本配置详情

在Redis双主架构中，Keeplived的脚本配置主要用于在节点故障时进行故障转移操作。以下是一个基本的Keeplived脚本配置示例：

#!/bin/bash

# 配置环境变量
export PATH=$PATH:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin

# 设置日志文件路径
LOG_FILE="/var/log/keepalived.log"

# 定义故障转移操作
case $1 in
    "master")
        # 当前节点变为主节点
        echo "`date +'%Y-%m-%d %H:%M:%S'` - Node $2 becomes master." >> $LOG_FILE
        ;;
    "backup")
        # 当前节点变为备份节点
        echo "`date +'%Y-%m-%d %H:%M:%S'` - Node $2 becomes backup." >> $LOG_FILE
        ;;
    "fault")
        # 当前节点故障，需要进行故障转移操作
        echo "`date +'%Y-%m-%d %H:%M:%S'` - Node $2 has fault, start to failover." >> $LOG_FILE

        # 判断当前节点是否为主节点
        if [ "$3" == "MASTER" ]; then
            # 如果当前节点为主节点，则需要将主节点切换到备份节点
            echo "`date +'%Y-%m-%d %H:%M:%S'` - Node $2 is master, switch to backup." >> $LOG_FILE

            # 执行切换操作
            /usr/local/bin/redis-cli -h 127.0.0.1 -p 6379 SLAVEOF $4 6379
        fi
        ;;
    *)
        # 未知命令
        echo "`date +'%Y-%m-%d %H:%M:%S'` - Unknown command: $1" >> $LOG_FILE
        ;;
esac

以上脚本配置中，主要包括以下几个部分：

1. 配置环境变量：设置脚本使用的环境变量。

2. 设置日志文件路径：指定脚本输出的日志文件路径。

3. 定义故障转移操作：根据Keeplived的通知内容进行相应的操作，包括当前节点变为主节点、备份节点或故障转移操作。

4. 判断当前节点是否为主节点：在故障转移操作中，需要判断当前节点是否为主节点，如果是，则需要将其切换到备份节点。

5. 执行切换操作：使用redis-cli命令进行主备切换操作。

以上是一个基本的Keeplived脚本配置示例，可以根据具体需求进行修改。