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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 302905874 by RudiC on Sunday 15th of June 2014 06:06:36 PM
Old 06-15-2014
Not sure I understand the logics of your code snippet. After appending stdout of the head command to /home/uplog.txt, you pipe stdout (which will be empty) to awk's stdin but make awk read the recently appended to file /home/uplog.txt at the same time? That can't work.
Does it have to be awk? Then you need e.g. a circular buffer that you print in the END section. Did you try the tail command?
 

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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). Free Software Foundation Nov 3 1999 IGAWK(1)
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