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Top Forums Shell Programming and Scripting reversing order of lines in a file Post 302109013 by gfhgfnhhn on Friday 2nd of March 2007 08:46:09 AM
Old 03-02-2007
Error reversing order of lines in a file

how can i reverse the line order in text files?
(but total number of the lines is not constant )

for example i have a file like this:

line1
line2
line3
.
.
lineN


i wantto make it like this:

lineN
.
.
.
line3
line2
line1
 

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rev(1)								   User Commands							    rev(1)

NAME
rev - reverse the characters or lines of one or more files SYNOPSIS
/usr/bin/rev [-l] [file ...] DESCRIPTION
rev copies one or more files to standard output, reversing the order of characters on every line of the file. OPTIONS
The following options are supported: -l Reverse the order of the lines of the file, instead of characters. --line OPERANDS
The following operands are supported: file Specifies the name of the file to use as input. If file is not specified, or if file is a -, rev copies from standard input starting at the current offset. EXIT STATUS
The following exit values are returned: 0 All files copied successfully. >0 One or more files did not copy. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ |CSI |Enabled | +-----------------------------+-----------------------------+ |Interface Stability |Committed | +-----------------------------+-----------------------------+ SEE ALSO
cat(1), ksh93(1)tail(1), attributes(5) SunOS 5.11 27 Jan 2009 rev(1)
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