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Full Discussion: awk last n lines of file
Top Forums Shell Programming and Scripting awk last n lines of file Post 302907128 by 1in10 on Thursday 26th of June 2014 04:54:40 AM
Old 06-26-2014
Okay, I will run that uptime-command for some time, but due to the heat in this particular room I cannot leave the computer running after 11:00 am. May you won't believe it, but 107.6 °Fahrenheit is simply to hot, even with a fan directed to it and an air-condition on. Let me put it this way, after re-reading your source-code.
what you wrote sure is this famous ring-buffer and I appreciate your persistence for pushing this newbie, for some people like me have to learn the hard way. But nonetheless your source-code is a fiendishly prank, throughout the last days with my provider working again, I came to a conclusion. One is given in your source-code, bash-variables used again in awk, secondly outsourcing, and third the structure I recently used for finding duplicates on a large file. Like this
Code:
 awk ' NR~/^1$/ , NR~/^7$/ {print $3, $11; next} ; ' data.txt

1. I will use or re-use the date-variable from the bash for a comparison,
2. outsourcing both calculations to /tmp and
3. re-read from there, since a few kilobyte won't kill any ram.
For sure there a Mozarts and Chopins on any keyboard handling this in a one-liner. What matters to me, that I understand what is written and that should be simple. Simplicity works. So I'll be back here as soon as my source-code improves significantly. Yesterday I even dared to create my first array, but I have to improve the output at stdout. Thats why I'd rather send it without an array to /tmp. But I'll be back, not diving away.
 

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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). ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +--------------------+-----------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +--------------------+-----------------+ |Availability | SUNWgawk | +--------------------+-----------------+ |Interface Stability | Volatile | +--------------------+-----------------+ NOTES
Source for gawk is available on http://opensolaris.org. Free Software Foundation Nov 3 1999 IGAWK(1)
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