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Top Forums Shell Programming and Scripting Combine awk statement into one Post 302934418 by RudiC on Friday 6th of February 2015 06:24:48 PM
Old 02-06-2015
First or last in a reversed file - my head starts spinning. How about posting in- and output samples, connecting them with some logic description and pointing to the one "Feb 2" that you want?
 

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ACYCLIC(1)						      General Commands Manual							ACYCLIC(1)

NAME
acyclic - make directed graph acyclic SYNOPSIS
acyclic [ -nv? ] [ -o outfile ] [ file ] DESCRIPTION
acyclic is a filter that takes a directed graph as input and outputs a copy of the graph with sufficient edges reversed to make the graph acyclic. The reversed edge inherits all of the attributes of the original edge. The optional file argument specifies where the the input graph is stored; by default, the program reads from stdin. OPTIONS
The following options are supported: -n No output is produced, though the return value will indicate whether the graph is acyclic or not. -v Print information about whether the file is acyclic, has a cycle or is undirected. -o outfile causes the output to be written to the specified file; by default, output is written to stdout. -? option causes the program to print usage information. RETURN CODES
acyclic returns 0 if the graph is acyclic; 1 if the graph has a cycle; 2 if the graph is undirected; and 255 if there are any errors. BUGS
If the graph is strict and there is a cycle of length 2, the attributes of the reversed edge are lost. Some edge attributes are non-symmetric, referring to either the head or tail node. At present, there is no mechanism or convention for cor- rectly switching or renaming these. AUTHORS
Stephen C. North <north@research.att.com> Emden R. Gansner <erg@research.att.com> SEE ALSO
gc(1), dot(1), gvpr(1), gvcolor(1), ccomps(1), sccmap(1), tred(1), libgraph(3) 21 March 2001 ACYCLIC(1)
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