怎样使用tar命令打包（备份）文件？ A:The syntax of tar is: tar [options][files] The options used most often with tar are as follows: c Creates a new backup,overwriting any files already on the backup destination. x Extracts files from backup media. t Lists the contents of backup media. v Displays the name of each file being processed. f Creates backups on a specified device. u Adds files to the backup if they are not already there,or if they have been modified since they we... 阅读全文