linux管道工具集中一個相當有用的小tool，從名字中即可看出，主要是從來處理標準輸入中的arguments，可以對一批arguments進行重組，提示，位置替換等功能。（爲何要重組：和shell命令一次最多能處理多少argument有關，替換可以使命令更加靈活）
標準用法：
xargs [options] [command ]
適用場景 ：配合ls、find等使用
Options
| Option | Description |
| -n# | Execute command once for every # argument. For example, -n2 bundles arguments into groups of two or less and executes command on each argument bundle. |
| -l# | Execute command once for every # lines of input. For example, -l1 creates a bundle of arguments for every one line of input and executes command on each argument bundle. |
| -i | Normally xargs places input arguments at the end of command . Used with the -i option, xargs will replace all instances of {} with input arguments. You need to put them in single brackets or use a backslash (/) before each bracket to keep the shell from interpreting the special characters. |
| -t | Echo each command before executing. Nice for debugging |
| -p | Prompts the user before executing each command . Useful for debugging. |
Examples
ls | xargs -i{} mv {} {}.old