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Full Discussion: How to process from middle of a file?
Top Forums Shell Programming and Scripting How to process from middle of a file? Post 302155052 by rikxik on Wednesday 2nd of January 2008 09:24:05 PM
Old 01-02-2008
I got syntax error with both solutions:

Code:
$ cat file
a nnnn sds
b ssss fdefd
c sdfd dsfd sdfds
Summary
t1 t2 t3 t4
s1 s2 s3 s4
f1 f2 f3 f4
$
$ a=`wc -l file | awk '{print $1}'` ; awk -v len=$a 'BEGIN {print len / 2} NR >= (len / 2)  {print}' file
awk: syntax error near line 1
awk: bailing out near line 1
$
$ awk '/^Summary/,/*/' file
awk: syntax error near line 1
awk: bailing out near line 1

Of course, I'm using SunOS so most probably due to awk version/kind - can be easily changed to nawk etc. to fix the issue.

However, how about this:

Code:
$ sed -ne '/Summary/,$p' file
Summary
t1 t2 t3 t4
s1 s2 s3 s4
f1 f2 f3 f4

I think this will be most efficient (if the file is very big) and should work on most unices.

HTH
 

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LEARN ABOUT DEBIAN

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)
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