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Full Discussion: Performance issue to read line by line
Top Forums UNIX for Beginners Questions & Answers Performance issue to read line by line Post 302972419 by Don Cragun on Thursday 5th of May 2016 04:20:37 AM
Old 05-05-2016
Quote:
Originally Posted by balu1729
Thanks Don- Will check the performance and update you.

I am also looking to write in one line code something like below..

Code:
cat test2.tlog | awk 'BEGIN { record_type=${record%"${record#????}"}; 
if (record_type == 1111) {a1=100; a2=0; a3=0; a4=0; a5=0; a6=0; a7=0;a8=0; a9=0} 
if (record_type == 2222) {a2=$(( a2 + 1 )); a3=$(( a3 + 2))} 
...
...
else printf $line_no$a1....$9;
printf $line_no$a1....$9
}' >> test1_all_data.log


Kindly let me know if you have any suggestions on this.

---------- Post updated at 01:12 AM ---------- Previous update was at 12:41 AM ----------

Thanks a lot Don for your support...

My initial script took around 21 min 35 sec, with the new code it is taking 15 sec.
I would have thought that by now you would know that the awk command language and the shell command language are not the same.

I could rewrite the 62 line, 1,595 character ksh93 script I suggested to instead be a ksh script invoking awk that would run about twice as fast as the ksh93 script, and still produce exactly the same output as the other three scripts.

But, I would never attempt to do that if I thought you were going to try to convert that readable, maintainable, understandable 42 line, 840 character script into an unreadable, unmaintainable, not understandable 1-liner. And, if I were to create such a script, it would not contain an unneeded use of cat that would only slow it down (just like the cat in your original script did).

---------------------------------

I'm glad to hear that one of the three scripts I suggested is working well for you.
 

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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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