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A
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其他
7z
sync - Linux命令大全 - 笔下光年
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sync
用于强制被改变的内容立刻写入磁盘 ## 补充说明 **sync命令** 用于强制被改变的内容立刻写入磁盘,更新超块信息。 在Linux/Unix系统中,在文件或数据处理过程中一般先放到内存缓冲区中,等到适当的时候再写入磁盘,以提高系统的运行效率。sync命令则可用来强制将内存缓冲区中的数据立即写入磁盘中。用户通常不需执行sync命令,系统会自动执行update或bdflush操作,将缓冲区的数据写 入磁盘。只有在update或bdflush无法执行或用户需要非正常关机时,才需手动执行sync命令。 ### 语法 ```shell sync(选项) ``` ### 选项 ```shell -d, --data 只同步文件数据,不同步不必要的元数据 -f, --file-system 同步包含这些文件的文件系统 --help:显示帮助; --version:显示版本信息。 ``` ### buffer与cache * buffer:为了解决写磁盘的效率 * cache:为了解决读磁盘的效率 linux系统为了提高读写磁盘的效率,会先将数据放在一块buffer中。在写磁盘时并不是立即将数据写到磁盘中,而是先写入这块buffer中了。此时如果重启系统,就可能造成数据丢失。 sync命令用来flush文件系统buffer,这样数据才会真正的写到磁盘中,并且buffer才能够释放出来,flush就是用来清空buffer。sync命令会强制将数据写入磁盘中,并释放该数据对应的buffer,所以常常会在写磁盘后输入sync命令来将数据真正的写入磁盘。 如果不去手动的输入sync命令来真正的去写磁盘,linux系统也会周期性的去sync数据。
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