rev.1

unix v7是最后一个广泛发布的研究型UNIX版本

.TH REV 1 
.SH NAME
rev \- reverse lines of a file
.SH SYNOPSIS
.B rev
[ file ] ...
.SH DESCRIPTION
.I Rev
copies the named files to the standard output,
reversing the order of characters in every line.
If no file is specified, the standard input is copied.