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Top Forums UNIX for Dummies Questions & Answers Column minus column operation? Post 302732525 by drl on Sunday 18th of November 2012 08:12:14 AM
Old 11-18-2012
Hi.

Similar to awk, Gary Perlman's |stat dm:
Code:
#!/usr/bin/env bash

# @(#) s1	Demonstrate column content arithmetic, |stat dm.
# See: http://hcibib.org/perlman/stat/index.html

# Utility functions: print-as-echo, print-line-with-visual-space, debug.
# export PATH="/usr/local/bin:/usr/bin:/bin"
pe() { for _i;do printf "%s" "$_i";done; printf "\n"; }
pl() { pe;pe "-----" ;pe "$*"; }
db() { ( printf " db, ";for _i;do printf "%s" "$_i";done;printf "\n" ) >&2 ; }
db() { : ; }
C=$HOME/bin/context && [ -f $C ] && $C awk dm

pl " Input data files data[12]:"
head data[12]

pl " Combined input files:"
paste data[12] > data3
head data3

pl " Results, bipinajith awk:"
awk ' { printf "%d %d %d\n", $1, ($2-$7), ($5-$8); } ' data3

pl " Results, dm"
dm x1 x2-x7 x5-x8 < data3

exit 0

producing:
Code:
% ./s1

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: Linux, 2.6.26-2-amd64, x86_64
Distribution        : Debian GNU/Linux 5.0.8 (lenny) 
bash GNU bash 3.2.39
awk GNU Awk 3.1.5
dm - ( local: ~/executable/dm, 2009-11-09 )

-----
 Input data files data[12]:
==> data1 <==
 7 	14 	10 	19 	15 
10 	 1 	14 	13 	20 
 5 	13 	11 	19 	 9 

==> data2 <==
10 	 5 	15 	16 	20 
 8 	 4 	14 	 4 	20 
 1 	12 	 7 	17 	 6 

-----
 Combined input files:
 7 	14 	10 	19 	15 	10 	 5 	15 	16 	20 
10 	 1 	14 	13 	20 	 8 	 4 	14 	 4 	20 
 5 	13 	11 	19 	 9 	 1 	12 	 7 	17 	 6 

-----
 Results, bipinajith awk:
7 9 0
10 -3 6
5 1 2

-----
 Results, dm:
7	9	0
10	-3	6
5	1	2

See web page noted in comments for details on |stat.

Best wishes ... cheers, drl

( Edit 1: corrected errors introduced by too-smart spelling corrector )

Last edited by drl; 11-19-2012 at 08:13 AM..
This User Gave Thanks to drl For This Post:
 

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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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