看看文件到底是干啥的,从哪里来到哪里去

1. 可执行文件 是啥类型的

type [filename]

2. locate a program file in the user's path

which [filename]

3. locate programs

whereis [filename]

4. 文件信息

stat [filename]

5. 文件内容编码格式

file [filename]