file.1

操作系统设计与实现源码

.TH FILE 1
.SH NAME
file \- make a guess as to a file's type based on contents
.SH SYNOPSIS
\fBfile \fIname ...\fR
.br
.de FL
.TP
\\fB\\$1\\fR
\\$2
..
.de EX
.TP 20
\\fB\\$1\\fR
# \\$2
..
.SH EXAMPLES
.EX "file a.out ar.h" "Guess at types"
.SH DESCRIPTION
.PP
\fIFile\fR reads the first block of a file and tries to make an 
intelligent guess about what kind of file it is.  
It understands about archives, C
source programs, executable binaries, shell scripts, and English text.