for i in /etc/init.d/S??* ;do # Ignore dangling symlinks (if any). [ ! -f "$i" ] && continue case "$i" in *.sh) # Source shell script for speed. ( trap - INT QUIT TSTP set start . $i ) ;; *) # No sh extension, so fork subprocess. $i start ;; esac done
时间: 2024-02-10 10:26:34 浏览: 26
这段代码是一个 shell 脚本,它遍历 `/etc/init.d` 目录下以 `S` 开头并跟着两个任意字符的文件。对于每个文件,它检查文件是否存在,如果是一个符号链接则跳过。然后,根据文件的扩展名进行不同的处理:
- 如果文件扩展名是 `.sh`,则使用子 shell 运行该脚本。
- 如果文件没有扩展名,那么它被认为是一个可执行文件,使用子进程运行该文件,并传递 `start` 参数。
简而言之,这段代码用于启动位于 `/etc/init.d` 目录下的系统服务。
相关问题
Use // eslint-disable-next-line to ignore the next line. Use /* eslint-disable */ to ignore all warnings in a file.
To ignore the next line in JavaScript for ESLint, you can use the `// eslint-disable-next-line` comment. Here's an example:
```javascript
// eslint-disable-next-line
console.log('This line will be ignored by ESLint');
```
To ignore all warnings in a file, you can use the `/* eslint-disable */` comment at the top of the file or before the section you want to ignore. Here's an example:
```javascript
/* eslint-disable */
console.log('This file will ignore all ESLint warnings');
// Some code here
/* eslint-enable */
```
Please note that while disabling ESLint warnings can be useful in some cases, it's generally recommended to address and fix the issues reported by ESLint for better code quality.
解释JAVA_HOME=/opt/module/jdk1.8.0_212 Verifying that we can write to /etc/cloudera-scm-server Creating SCM configuration file in /etc/cloudera-scm-server Executing: /opt/module/jdk1.8.0_212/bin/java -cp /usr/share/java/mysql-connector-java.jar:/usr/share/java/oracle-connector-java.jar:/usr/share/java/postgresql-connector-java.jar:/opt/cloudera/cm/schema/../lib/* com.cloudera.enterprise.dbutil.DbCommandExecutor /etc/cloudera-scm-server/db.properties com.cloudera.cmf.db. [ main] DbCommandExecutor INFO Unable to find JDBC driver for database type: MySQL [ main] DbCommandExecutor ERROR JDBC Driver com.mysql.jdbc.Driver not found. [ main] DbCommandExecutor ERROR Exiting with exit code 3 --> Error 3, giving up (use --force if you wish to ignore the error)
这段日志是在执行一个命令时产生的错误信息。让我逐步解释一下:
1. 第一行是设置了JAVA_HOME环境变量的路径为"/opt/module/jdk1.8.0_212"。这是指定了Java安装的目录。
2. "Verifying that we can write to /etc/cloudera-scm-server" 表示正在验证是否有权限写入 /etc/cloudera-scm-server 目录。
3. "Creating SCM configuration file in /etc/cloudera-scm-server" 表示正在创建配置文件,在 /etc/cloudera-scm-server 目录下。
4. "Executing: /opt/module/jdk1.8.0_212/bin/java -cp /usr/share/java/mysql-connector-java.jar:/usr/share/java/oracle-connector-java.jar:/usr/share/java/postgresql-connector-java.jar:/opt/cloudera/cm/schema/../lib/* com.cloudera.enterprise.dbutil.DbCommandExecutor /etc/cloudera-scm-server/db.properties com.cloudera.cmf.db." 这是执行的具体命令,使用了Java来运行 com.cloudera.enterprise.dbutil.DbCommandExecutor 类,并传递了一些参数。
5. "[ main] DbCommandExecutor INFO Unable to find JDBC driver for database type: MySQL" 表示无法找到 MySQL 数据库的 JDBC 驱动程序。
6. "[ main] DbCommandExecutor ERROR JDBC Driver com.mysql.jdbc.Driver not found." 表示找不到 com.mysql.jdbc.Driver 这个 JDBC 驱动程序。
7. "[ main] DbCommandExecutor ERROR Exiting with exit code 3" 表示程序以错误代码 3 退出。
8. "--> Error 3, giving up (use --force if you wish to ignore the error)" 表示错误代码为 3,如果想要忽略该错误,可以使用 --force 参数。
根据日志信息来看,主要的问题是找不到 MySQL 的 JDBC 驱动程序。你可能需要确保已经正确安装了 MySQL JDBC 驱动,并且在命令中指定正确的驱动程序路径。