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Full Discussion: how to generate a random list from a given list
Top Forums Shell Programming and Scripting how to generate a random list from a given list Post 302075049 by aigles on Tuesday 30th of May 2006 03:30:40 AM
Old 05-30-2006
Try something like this
Code:
#! /usr/bin/ksh
#
# Usage: $0 [file [count]]
# 

File=${1}
Count=${2:-10}

while read line
do
   echo "$RANDOM§$line"
done < $File     |  \
sort -t§ -k1,1n  |  \
head -$Count     |  \
cut -d§ -f2-

 

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LEARN ABOUT DEBIAN

gc

GC(1)							      General Commands Manual							     GC(1)

NAME

       gc - count graph components

SYNOPSIS

       gc [ -necCaDUrs?  ] [ files ]

DESCRIPTION

       gc is a graph analogue to wc in that it prints to standard output the number of nodes, edges, connected components or clusters contained in
       the input files.  It also prints a total count for all graphs if more than one graph is given.

OPTIONS

       The following options are supported:

       -n     Count nodes.

       -e     Count edges.

       -c     Count connected components.

       -C     Count clusters. By definition, a cluster is a graph or subgraph whose name begins with "cluster".

       -a     Count all. Equivalent to -encC

       -r     Recursively analyze subgraphs.

       -s     Print no output. Only exit value is important.

       -D     Only analyze directed graphs.

       -U     Only analyze undirected graphs.

       -?     Print usage information.

       By default, gc returns the number of nodes and edges.

OPERANDS

       The following operand is supported:

       files   Names of files containing 1 or more graphs in dot format.  If no files operand is specified, the standard input will be used.

EXIT STATUS

       The following exit values are returned:

       0   Successful completion.

       1   The -U or -E option was used, and a graph of the wrong type was encountered.

AUTHOR

       Emden R. Gansner <erg@research.att.com>

SEE ALSO

       wc(1), acyclic(1), gvpr(1), gvcolor(1), ccomps(1), sccmap(1), tred(1), libgraph(3)

								   21 March 2001							     GC(1)
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