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Full Discussion: How to extract column consistently ?
Top Forums Shell Programming and Scripting How to extract column consistently ? Post 302560451 by agama on Thursday 29th of September 2011 11:39:19 PM
Old 09-30-2011
Solutions that do not rely on the fixed position of the columns:

This will probably be a wee bit slower, but won't require any advance knowledge of the number of columns, nor their position. It does assume that there is no leading whitespace when there is something in column 1.
Code:
awk '{ gsub( "[ \t]+", "," ); split( $0, a, "," ); print a[4] }' input-file


This is space independent, but requires knowledge of the number of columns in a 'short' row.
Code:
awk 'NF == 4 { print $3; next; } {print $4}'

One more that depends on a constant number of columns to the right of the desired column:
Code:
awk '{ print $(NF-1) }'

Change the 1 to be the number of colums from the right most column that you want printed.
Last edited by agama; 09-30-2011 at 12:42 AM.. Reason: Additional thought.
This User Gave Thanks to agama For This Post:
johnsanty
 

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cpanplus::shell

CPANPLUS::Shell(3perl)					 Perl Programmers Reference Guide				    CPANPLUS::Shell(3perl)

NAME

       CPANPLUS::Shell - base class for CPANPLUS shells

SYNOPSIS

	   use CPANPLUS::Shell; 	    # load the shell indicated by your
					    # config -- defaults to
					    # CPANPLUS::Shell::Default

	   use CPANPLUS::Shell qw[Classic]  # load CPANPLUS::Shell::Classic;

	   my $ui      = CPANPLUS::Shell->new();
	   my $name    = $ui->which;	    # Find out what shell you loaded

	   $ui->shell;			    # run the ui shell

DESCRIPTION

       This module is the generic loading (and base class) for all "CPANPLUS" shells. Through this module you can load any installed "CPANPLUS"
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       Just about all the functionality is provided by the shell that you have loaded, and not by this class (which merely functions as a generic
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AUTHOR

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COPYRIGHT

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SEE ALSO

       CPANPLUS::Shell::Default, CPANPLUS::Shell::Classic, cpanp

perl v5.14.2							    2014-09-29						    CPANPLUS::Shell(3perl)
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