通过其绝对文件路径运行linux命令

Giving the command ls at the prompt would do a bit more than just call /bin/ls. If ls was an alias or a function, that alias or function would be called. If it was neither, and if it furthermore was not a built-in command (ls is very rarely a built-in command), then a path search would be performed for ls in each directory in the :-delimited list in the $PATH environment variable.

The ls that was first found in $PATH would be executed. This could potentially be another ls than /bin/ls if a directory that contained such a name was located earlier than /bin in the $PATH list.

使用/bin/sh将绕过别名和函数查找以及其中的任何查找，$PATH而是直接运行该命令。

在输出的色差之间ls并/bin/ls可能会因来解释ls作为一个别名调用时增加了额外的命令行选项ls实用程序（检查用alias ls或type -a ls在bash）。