10-29-2013
1. i am getting a syntax error around the n = match ( $i, /n[^n]*$/ )..may be i am not pasting the character correctly.
Use nawk instead if you are using SunOS or Solaris
2. This code is scanning all variables and i would like to search only the 4th column. I think i can do that by adding a if clause for i==4.
Yes, remove the for loop and put $4 instead: n = match ( $4, /n[^n]*$/ )
3. I am onto text mining a huge file set i.e. 10 million records. Is line by line scanning a viable option ??
Yes.
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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)