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Full Discussion: Unix c-shell - replacing/incrementing values in columns?
Top Forums Shell Programming and Scripting Unix c-shell - replacing/incrementing values in columns? Post 302370135 by drl on Tuesday 10th of November 2009 01:14:23 PM
Old 11-10-2009
Hi.

I waited until the awk solutions were working for the OP to avoid confusing the issue. I think awk is best for this kind of task. The language may look odd at first, but it allows solutions that are flexible, powerful, and succinct However, if |stat routines are required, here is how it might look:
Code:
#!/usr/bin/env bash

# @(#) s1	Demonstrate manipulation with |stat dm.

echo
set +o nounset
LC_ALL=C ; LANG=C ; export LC_ALL LANG
echo "Environment: LC_ALL = $LC_ALL, LANG = $LANG"
echo "(Versions displayed with local utility \"version\")"
version >/dev/null 2>&1 && version "=o" $(_eat $0 $1) dm
set -o nounset
echo

FILE=${1-data1}

echo " Data file $FILE:"
cat $FILE

echo
echo " Results:"
dm x1 "if x1 = 0 then x2+1 else x2" < $FILE

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 
GNU bash 3.2.39
dm - (local: ~/executable/dm Nov 9 16:22 )

 Data file data1:
2 21
1 12
3 123
4 1234
6 49
0 49
33 212

 Results:
2	21
1	12
3	123
4	1234
6	49
0	50
33	212

This was done using the information in man dm. If the earlier awk solutions (involving bang [!]) were to be placed in a Bourne shell family script (sh, bash, zsh), the troubles may not have occurred. I use tcsh a lot for interactive work, but very rarely for scripting, hence I would not have written the command interactively, but I would have placed it in a script -- anything used more than twice, takes arguments, or is "long", I place into a script.

Knowing more than one approach is often useful, and is the heart of *nix systems ... cheers, drl
 

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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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