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Full Discussion: How to avoid column with a specific name using awk
Top Forums Shell Programming and Scripting How to avoid column with a specific name using awk Post 302895738 by Don Cragun on Wednesday 2nd of April 2014 08:21:14 AM
Old 04-02-2014
This version doesn't add an extra field separator at the end of a line and is perfectly happy no matter how many of the fields are rejected. It also uses two spaces as the field separator (matching the input and output samples).
Code:
awk '
NR == 1 {
	for(i = 1; i <= NF; i++)
		if($i !~ /^Nx_/)
			of[++ofc] = i
}
{	for(i = 1; i <= ofc; i++)
		printf("%s%s", $of[i], i == ofc ? "" : "  ")
	print ""
}' file1

which, with the given sample input, produces the output:
Code:
name  NN
a1  8
b1  8

If you want to use this on a Solaris/SunOS system, use /usr/xpg4/bin/awk, /usr/xpg6/bin/awk, or nawk instead of the default /usr/bin/awk.
These 2 Users Gave Thanks to Don Cragun For This Post:
quincyjones RavinderSingh13
 

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LEARN ABOUT OSX

colrm

COLRM(1)						    BSD General Commands Manual 						  COLRM(1)

NAME

     colrm -- remove columns from a file

SYNOPSIS

     colrm [start [stop]]

DESCRIPTION

     The colrm utility removes selected columns from the lines of a file.  A column is defined as a single character in a line.  Input is read
     from the standard input.  Output is written to the standard output.

     If only the start column is specified, columns numbered less than the start column will be written.  If both start and stop columns are spec-
     ified, columns numbered less than the start column or greater than the stop column will be written.  Column numbering starts with one, not
     zero.

     Tab characters increment the column count to the next multiple of eight.  Backspace characters decrement the column count by one.

ENVIRONMENT

     The LANG, LC_ALL and LC_CTYPE environment variables affect the execution of colrm as described in environ(7).

EXIT STATUS

     The colrm utility exits 0 on success, and >0 if an error occurs.

SEE ALSO

     awk(1), column(1), cut(1), paste(1)

HISTORY

     The colrm command appeared in 3.0BSD.

BSD
								  August 4, 2004							       BSD
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