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Full Discussion: Comparing rows in same file and writing the result in new file
Top Forums Shell Programming and Scripting Comparing rows in same file and writing the result in new file Post 302467414 by ctsgnb on Friday 29th of October 2010 09:12:43 AM
Old 10-29-2010
Code:
grep -vE ^[:blank:]*$ input | tail -4 >/tmp/last4lines
check(){
if [[ $1 != $3 ]] 
then
echo "ERROR : cannot compare different first fields"
else
let res=$4-$2
[[ $res = 0 ]] && echo "$a" || echo "$a $res"
fi
}
sed '1~2' /tmp/last4lines | xargs | read a b c d
eval check $a $b $c $d >>output
sed '2~2' /tmp/last4lines | xargs | read a b c d
eval check $a $b $c $d >>output

 

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LEARN ABOUT PHP

pg_num_rows

PG_NUM_ROWS(3)															    PG_NUM_ROWS(3)

pg_num_rows - Returns the number of rows in a result

SYNOPSIS

       int pg_num_rows (resource  $result)

DESCRIPTION

       pg_num_rows(3) will return the number of rows in a PostgreSQL result resource.

       Note

	       This function used to be called pg_numrows(3).

PARAMETERS

	      o $result
		- PostgreSQL query result resource, returned by pg_query(3), pg_query_params(3) or pg_execute(3) (among others).

RETURN VALUES

	The number of rows in the result. On error, -1 is returned.

EXAMPLES

       Example #1

	      pg_num_rows(3) example

	      <?php
	      $result = pg_query($conn, "SELECT 1");

	      $rows = pg_num_rows($result);

	      echo $rows . " row(s) returned.
";
	      ?>

	      The above example will output:

	      1 row(s) returned.

SEE ALSO

       pg_num_fields(3), pg_affected_rows(3).

PHP Documentation Group 													    PG_NUM_ROWS(3)
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