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Top Forums Shell Programming and Scripting Reversing file order using SED Post 302274313 by sharadpisal on Wednesday 7th of January 2009 09:10:40 AM
Old 01-07-2009
Like cat, there is command named 'tac' which works same as that cat, except it reverse the order.
ur script can be like:

tac f1 > f1.tmp
mv f1.tmp f1
 

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TAC(1)								   User Commands							    TAC(1)

NAME
tac - concatenate and print files in reverse SYNOPSIS
tac [OPTION]... [FILE]... DESCRIPTION
Write each FILE to standard output, last line first. With no FILE, or when FILE is -, read standard input. Mandatory arguments to long options are mandatory for short options too. -b, --before attach the separator before instead of after -r, --regex interpret the separator as a regular expression -s, --separator=STRING use STRING as the separator instead of newline --help display this help and exit --version output version information and exit GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report tac translation bugs to <http://translationproject.org/team/> AUTHOR
Written by Jay Lepreau and David MacKenzie. COPYRIGHT
Copyright (C) 2013 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO
rev(1) The full documentation for tac is maintained as a Texinfo manual. If the info and tac programs are properly installed at your site, the command info coreutils 'tac invocation' should give you access to the complete manual. GNU coreutils 8.22 June 2014 TAC(1)
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