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Full Discussion: Variable interpolation in "print" of awk command
Top Forums Shell Programming and Scripting Variable interpolation in "print" of awk command Post 302601037 by forums123456 on Wednesday 22nd of February 2012 06:07:45 PM
Old 02-22-2012
Variable interpolation in "print" of awk command
Hi,
I have a snippet like below.
Based on variable i, i wish to print 1,2,3,4,5th columns to Sample files.
For each loop, one column from contetn and results will be pused to sample files. But i have a problem here
Code:
i=1
while [ $i -le 5 ]; do
`awk -F"\t" '{print $($i)}' $content > Sample_${i}_original`;
`awk -F"\t" '{print $($i)}' $results > Sample_${i}_results`;
i=`expr $i+1|bc`;
done

Variable i is not being interpolated inside awk command
Code:
'{print $($i)}'

I tried many variations of it like
Code:
"{print $($i)}"
'{print $i}'

but nothing works.
How can i modify the code to make variable i is interpolated under print of awk command?
Appreciate your responses.
Last edited by Franklin52; 02-23-2012 at 04:17 AM.. Reason: Please use code tags for code and indent your code, thank you
 

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rake

RAKE(1) 						 Ruby Programmers Reference Guide						   RAKE(1)

NAME

     rake -- Ruby Make

SYNOPSIS

     rake [--f Rakefile] [--version] [-CGNPgnqstv] [-D [PATTERN]] [-E CODE] [-I LIBDIR] [-R RAKELIBDIR] [-T [PATTERN]] [-e CODE] [-p CODE]
	  [-r MODULE] [--rules] [variable=value] target ...

DESCRIPTION

     Rake is a simple ruby(1) build program with capabilities similar to the regular make(1) command.

     Rake has the following features:

     o	 Rakefiles (Rake's version of Makefiles) are completely defined in standard Ruby syntax.  No XML files to edit. No quirky Makefile syntax
	 to worry about (is that a tab or a space?).

     o	 Users can specify tasks with prerequisites.

     o	 Rake supports rule patterns to synthesize implicit tasks.

     o	 Flexible FileLists that act like arrays but know about manipulating file names and paths.

     o	 A library of prepackaged tasks to make building rakefiles easier.

OPTIONS

     --version		 Display the program version.

     -C
     --classic-namespace
			 Put Task and FileTask in the top level namespace

     -D [PATTERN]
     --describe [PATTERN]
			 Describe the tasks (matching optional PATTERN), then exit.

     -E CODE
     --execute-continue CODE
			 Execute some Ruby code, then continue with normal task processing.

     -G
     --no-system
     --nosystem 	 Use standard project Rakefile search paths, ignore system wide rakefiles.

     -I LIBDIR
     --libdir LIBDIR	 Include LIBDIR in the search path for required modules.

     -N
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     --nosearch 	 Do not search parent directories for the Rakefile.

     -P
     --prereqs		 Display the tasks and dependencies, then exit.

     -R RAKELIBDIR
     --rakelib RAKELIBDIR
     --rakelibdir RAKELIBDIR
			 Auto-import any .rake files in RAKELIBDIR.  (default is rakelib )

     -T [PATTERN]
     --tasks [PATTERN]	 Display the tasks (matching optional PATTERN) with descriptions, then exit.

     -e CODE
     --execute CODE	 Execute some Ruby code and exit.

     -f FILE
     --rakefile FILE	 Use FILE as the rakefile.

     -h
     --help		 Prints a summary of options.

     -g
     --system		 Using system wide (global) rakefiles (usually ~/.rake/*.rake ).

     -n
     --dry-run		 Do a dry run without executing actions.

     -p CODE
     --execute-print CODE
			 Execute some Ruby code, print the result, then exit.

     -q
     --quiet		 Do not log messages to standard output.

     -r MODULE
     --require MODULE	 Require MODULE before executing rakefile.

     -s
     --silent		 Like --quiet, but also suppresses the 'in directory' announcement.

     -t
     --trace		 Turn on invoke/execute tracing, enable full backtrace.

     -v
     --verbose		 Log message to standard output (default).

     --rules		 Trace the rules resolution.

SEE ALSO

     ruby(1) make(1)

     http://rake.rubyforge.org/

REPORTING BUGS

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     You will need an account to before you can post issues. Register at <http://onestepback.org/redmine/account/register>.  Or you can send an
     email to the author.

AUTHOR

     Rake is written by Jim Weirich <jim@weirichhouse.org>

UNIX
								 November 7, 2012							      UNIX
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