Bash 4.0 increment variable Post: 302646545

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Top Forums Shell Programming and Scripting Bash 4.0 increment variable Post 302646545 by theodorosGreece on Friday 25th of May 2012 09:15:31 AM

05-25-2012

Registered User

[Solved] Bash 4.0 increment variable

Hi there everyone!

This is my first post so be gentle.

I have a small bash script that is extracting 3 line every 3 lines. I got the AWK part but i cant do the loop part.

Code:

#!/bin/bash
export line=`awk 'END { print NR }' btnew`
echo $line

for i in {1..$line..3} #increment
do 
echo " "
awk "NR==$i,NR==$i+2" btnew #print  line n until n+2
echo " "
done

For some reason passing the total sum of lines ($line) to the increment wont work.
Any ideas?

Ouput:

Code:

9
 
awk: NR=={1..9..3},NR=={1..9..3}+2
awk:     ^ syntax error
awk: NR=={1..9..3},NR=={1..9..3}+2
awk:          ^ syntax error
awk: NR=={1..9..3},NR=={1..9..3}+2
awk:              ^ syntax error
awk: NR=={1..9..3},NR=={1..9..3}+2
awk:                        ^ syntax error

Last edited by theodorosGreece; 05-25-2012 at 11:00 AM.. Reason: solved

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igawk

IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME

       igawk - gawk with include files

SYNOPSIS

       igawk [ all gawk options ] -f program-file [ -- ] file ...
       igawk [ all gawk options ] [ -- ] program-text file ...

DESCRIPTION

       Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1).

       AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like

	      @include getopt.awk

       in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path.

OPTIONS

       See gawk(1) for a full description of the AWK language and the options that gawk supports.

EXAMPLES

       cat << EOF > test.awk
       @include getopt.awk

       BEGIN {
	    while (getopt(ARGC, ARGV, "am:q") != -1)
		 ...
       }
       EOF

       igawk -f test.awk

SEE ALSO

       gawk(1)

       Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995.

AUTHOR

       Arnold Robbins (arnold@skeeve.com).

Free Software Foundation					    Nov 3 1999								  IGAWK(1)