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Top Forums Shell Programming and Scripting Could someone give me an example of awk accessing array defined in Korn Shell? Post 302207121 by biglau on Thursday 19th of June 2008 07:26:48 AM
Old 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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PARSE_STR(3)								 1							      PARSE_STR(3)

parse_str - Parses the string into variables

SYNOPSIS
void parse_str (string $str, [array &$arr]) DESCRIPTION
Parses $str as if it were the query string passed via a URL and sets variables in the current scope. Note To get the current QUERY_STRING, you may use the variable $_SERVER['QUERY_STRING']. Also, you may want to read the section on vari- ables from external sources. Note The magic_quotes_gpc setting affects the output of this function, as parse_str(3) uses the same mechanism that PHP uses to populate the $_GET, $_POST, etc. variables. PARAMETERS
o $str - The input string. o $arr - If the second parameter $arr is present, variables are stored in this variable as array elements instead. RETURN VALUES
No value is returned. EXAMPLES
Example #1 Using parse_str(3) <?php $str = "first=value&arr[]=foo+bar&arr[]=baz"; parse_str($str); echo $first; // value echo $arr[0]; // foo bar echo $arr[1]; // baz parse_str($str, $output); echo $output['first']; // value echo $output['arr'][0]; // foo bar echo $output['arr'][1]; // baz ?> SEE ALSO
parse_url(3), pathinfo(3), http_build_query(3), get_magic_quotes_gpc(3), urldecode(3). PHP Documentation Group PARSE_STR(3)
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