V10/man/man1/rev.1

.TH REV 1
.CT 1 writing_output files
.SH NAME
rev, revpag \- reverse lines or pages
.SH SYNOPSIS
.B rev
[
.I file ...
]
.PP
.B revpag
[
.I option ...
]
[
.I file ...
]
.SH DESCRIPTION
.I Rev
copies the standard input or the named files to the standard output, reversing
the order of characters in every line.
.PP
.I Revpag
copies the standard input or the named files to the standard output,
reversing the order of the pages.
(The name 
.L -
means the standard input.)
Options define what constitutes a `page':
.TP
.BI -d
The input is
.IR troff (1)
output; page breaks are encoded in it.
.TP
.BI -f
Append a new-page character (014) to the last input page (which is the first
page on the output), if this page is not of the declared length.
.TP
.BI -l " n"
Set the number of lines per page in
ordinary
.SM ASCII 
input (66 by default).
A new-page character (014) is also recognized
as a page break.
.TP
.BI -o " list"
Output only pages whose page numbers appear in
the comma-separated
.I list
of numbers and ranges.
A `page number' means the ordinal position of a page
in the input.
A range
.IB n - m 
means pages
.I n
through
.I m.
In a range, a missing
.I m
means the beginning; a missing
.I n
means the end.
.SH EXAMPLES
.TP
.B "rev <webster | sort | rev >walker
From a standard Webster's dictionary,
produce Walker's rhyming dictionary, which is alphabetized
from right to left.
.TP
.B "tail -r <forward >backward
Reverse the order of lines in a file; see
.IR tail (1).