该
file工具可用于识别可执行文件。
例：
> file /Applications/TextEdit.app/Contents/MacOS/TextEdit /Applications/TextEdit.app/Contents/MacOS/TextEdit: Mach-O universal binary with 2 architectures/Applications/TextEdit.app/Contents/MacOS/TextEdit (for architecture x86_64): Mach-O 64-bit executable x86_64/Applications/TextEdit.app/Contents/MacOS/TextEdit (for architecture i386): Mach-O executable i386
