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Full Discussion: How to reverse output?
Top Forums Shell Programming and Scripting How to reverse output? Post 302275731 by cfajohnson on Monday 12th of January 2009 03:13:46 AM
Old 01-12-2009

Some systems have a command, tac, that does what you want. If not, you can do it with:

Code:
awk '{ x = $0 "\n" x } END { printf "%s", x }'

 

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LEARN ABOUT DEBIAN

revnetgroup

REVNETGROUP(8)							 Reference Manual						    REVNETGROUP(8)

NAME

       revnetgroup - generate reverse netgroup data

SYNOPSIS

       /usr/lib/yp/revnetgroup [-u|-h]

DESCRIPTION

       Revnetgroup  processes the standard input in netgroup(5) format into what is called reverse netgroup form. That is, where the original file
       shows netgroup memberships in terms of which members reside in a particular group, the reverse netgroup format specifies  what  groups  are
       associated  with a particular member. This information is used to generate the netgroup.byuser and netgroup.byhosts NIS maps. These reverse
       netgroup maps are used to help speed up netgroup lookups, particularly for the innetgr library function.

       The revnetgroup command prints its results on the standard output. It is usually called only by /var/yp/Makefile when  rebuilding  the  NIS
       netgroup maps.

OPTIONS

       The revnetgroup command supports the following options:

       -u     Generate netgroup.byuser output; only username information in the original netgroup file is processed.

       -h     Generate netgroup.byhost output; only hostname information in the original netgroup file is processed.

       Note at least one of the both flags must be specified.

FILES

       /var/yp/Makefile    The Makefile to build the NIS databases
       /etc/netgroup	   the default netgroup database file. This file is most often found only on the NIS master server

SEE ALSO

       getnetgrent(3), netgroup(5),

AUTHOR

       revnetgroup was written by Thorsten Kukuk <kukuk@suse.de>.

YP Server							    August 2001 						    REVNETGROUP(8)
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