之间有什么区别.和./在bash中? [英] What is the difference between . and ./ in bash?

问题描述

运行此命令(其中a.out是有效的C可执行文件):

Running this command (where a.out is a valid C executable):

. a.out

...导致此错误:

bash:.:a.out:无法执行二进制文件

bash: .: a.out: cannot execute binary file

但是，运行以下命令:

./a.out

...成功执行了C二进制可执行文件.

...successfully executes the C binary executable.

很明显，这里有两种执行方式，有什么不同?

Clearly, there are 2 types of executions happening here, what's different?

推荐答案

shell使用空格分隔要运行的命令及其参数.

The shell uses spaces to separate the command to run and its parameters.

在第一个示例中，要运行的命令是.，其参数为a.out. .命令是source的shell快捷方式，该快捷方式将包含shell命令的文件名作为第一个参数，并在当前shell中运行这些命令.该命令失败，因为a.out是二进制文件，而不是Shell脚本.

In the first example, the command to run is . with a parameter of a.out. The . command is a shell shortcut for source, which takes the name of a file containing shell commands as its first parameter and runs those commands in the current shell. This command fails because a.out is a binary file, not a shell script.

在第二个示例中，要运行的命令是./a.out，这意味着运行当前目录中的文件a.out.

In the second example, the command to run is ./a.out, which means run the file a.out residing in the current directory.

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