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Full Discussion: displaying columns based on column name
Top Forums Shell Programming and Scripting displaying columns based on column name Post 302635727 by tukuyomi on Sunday 6th of May 2012 02:49:31 PM
Old 05-06-2012
(I reply here to share with the community)
Received from PM
Quote:
Originally Posted by ryan9011
Hello,
Thanks for the code. But I have one more question to ask. I don't get the header in my output file where should I put it in code?

Regards,
R
Code:
#!/bin/sh

file="$1"; shift

awk -v cols="$*" '
BEGIN{
	split(cols,C)
	OFS=FS="\t"
	getline
	split($0,H)
	for(c in C){
		for(h in H){
			if(C[c]==H[h])F[i++]=h
		}
		l=l C[c] OFS
	}
	print l
}
{ l="";for(f in F){l=l $F[f] OFS}print l }

' "$file"

---------- Post updated at 08:49 PM ---------- Previous update was at 09:03 AM ----------

Here is a more condensed version of the same script, it displays the header with no extra code:
Code:
#!/bin/sh

file="$1"; shift

awk -v c="$*" '
BEGIN{split(c,C);OFS=FS="\t"}
NR==1{
  for(c in C){
    f=0;while(f++<NF){
      if(C[c]==$f)F[i++]=f
}}}
{l="";for(f in F)l=l $F[f] OFS}
$0=l' "$file"

exit 0

*feels like I miss something to make this code simpler, but I can't figure out :p*
This User Gave Thanks to tukuyomi For This Post:
ryan9011
 

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LEARN ABOUT DEBIAN

column

COLUMN(1)						    BSD General Commands Manual 						 COLUMN(1)

NAME

     column -- columnate lists

SYNOPSIS

     column [-entx] [-c columns] [-s sep] [file ...]

DESCRIPTION

     The column utility formats its input into multiple columns.  Rows are filled before columns.  Input is taken from file operands, or, by
     default, from the standard input.	Empty lines are ignored unless the -e option is used.

     The options are as follows:

     -c      Output is formatted for a display columns wide.

     -s      Specify a set of characters to be used to delimit columns for the -t option.

     -t      Determine the number of columns the input contains and create a table.  Columns are delimited with whitespace, by default, or with
	     the characters supplied using the -s option.  Useful for pretty-printing displays.

     -x      Fill columns before filling rows.

     -n      By default, the column command will merge multiple adjacent delimiters into a single delimiter when using the -t option; this option
	     disables that behavior. This option is a Debian GNU/Linux extension.

     -e      Do not ignore empty lines.

ENVIRONMENT

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

EXIT STATUS

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

EXAMPLES

	   (printf "PERM LINKS OWNER GROUP SIZE MONTH DAY " ; 
	   printf "HH:MM/YEAR NAME
" ; 
	   ls -l | sed 1d) | column -t

SEE ALSO

     colrm(1), ls(1), paste(1), sort(1)

HISTORY

     The column command appeared in 4.3BSD-Reno.

BUGS

     Input lines are limited to LINE_MAX (2048) bytes in length.

BSD
								   July 29, 2004							       BSD
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