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Top Forums Shell Programming and Scripting How to read file, and replace certain string with another string? Post 302927741 by RudiC on Friday 5th of December 2014 07:08:23 AM
Old 12-05-2014
This task is almost impossible in awk as it doesn't have bit operations. But, in (recent) bash, you could try this:
Code:
while IFS="/" read A B
        do DL=$'\t'
           printf "%s/%s" $A $B 
           for i in 24 16 8 0
                do printf "%s%d" "$DL" $(((2**32-1 ^ (2**(32-B)-1) >> $i) & 255))
                   DL="."
                done
           printf "\n"
        done < file
10.0.0.0/8        255.0.0.0
10.0.0.0/10       255.192.0.0
172.16.1.0/16     255.255.0.0
172.16.1.0/18     255.255.192.0
192.168.1.0/24    255.255.255.0
192.168.1.0/32    255.255.255.255

This User Gave Thanks to RudiC For This Post:
 

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FPRINTF(3)								 1								FPRINTF(3)

fprintf - Write a formatted string to a stream

SYNOPSIS
int fprintf (resource $handle, string $format, [mixed $args], [mixed $...]) DESCRIPTION
Write a string produced according to $format to the stream resource specified by $handle. PARAMETERS
o $handle -A file system pointer resource that is typically created using fopen(3). o $format - See sprintf(3) for a description of $format. o $args - o $... - RETURN VALUES
Returns the length of the string written. EXAMPLES
Example #1 fprintf(3): zero-padded integers <?php if (!($fp = fopen('date.txt', 'w'))) { return; } fprintf($fp, "%04d-%02d-%02d", $year, $month, $day); // will write the formatted ISO date to date.txt ?> Example #2 fprintf(3): formatting currency <?php if (!($fp = fopen('currency.txt', 'w'))) { return; } $money1 = 68.75; $money2 = 54.35; $money = $money1 + $money2; // echo $money will output "123.1"; $len = fprintf($fp, '%01.2f', $money); // will write "123.10" to currency.txt echo "wrote $len bytes to currency.txt"; // use the return value of fprintf to determine how many bytes we wrote ?> SEE ALSO
printf(3), sprintf(3), sscanf(3), fscanf(3), vsprintf(3), number_format(3). PHP Documentation Group FPRINTF(3)
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