06-19-2008
Quote:
Originally Posted by
dhanamurthy
Please modify the example
awk '{
key=substr($0,1,10)
key1=substr($0,1,21)
if(arr[key])
{
arr[key]=1
}
else
{
arr[key]=$0
}
}
END {for (i in arr) {print arr[i]} } ' file_name
dhanamurthy, thank you for your reply, but could you please specify how the array name "arr" was defined outside of awk snippet (in shell)?
and the $0 means every line from the file? so your statement key=substr($0,1,10) means the 1-10 characters of the lines in the file, but you use it like this arr[key], sorry I do not understand.
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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)