file.1

UNIX v6源代码 这几乎是最经典的unix版本 unix操作系统设计和莱昂氏unix源代码分析都是用的该版

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.sh NAME
file \*- determine file type
.sh SYNOPSIS
.bd file
file ...
.sh DESCRIPTION
.it File
performs a series of tests on each argument
in an attempt to classify it.
If an argument appears to be ascii,
.it file
examines the first 512 bytes
and tries to guess its language.
.sh BUGS