Perl sprintf: How Do I Use sprintf In a Perl Script?

by on March 14, 2007 · 3 comments· LAST UPDATED June 17, 2011

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How do I use sprintf() function in a perl script under Linux or UNIX?

Perl printf() function is used to format and print data on screen. You need to use sprintf() to print or store formatted data/string to a variable or to a string. Perl does its own sprintf formatting--it emulates the C function sprintf, but it doesn't use it (except for floating-point numbers, and even then only the standard modifiers are allowed). As a result, any non-standard extensions in your local sprintf are not available from Perl.

Perl printf() Example

The following statement will round number to 2 digits after decimal point, enter:

 
perl -e '$num=53535.35353535;printf ("Result = %.2f\n",$num);'
 

Perl sprintf() Example

Type the following at the shell prompt:

 
perl -e '$num=53535.35353535;$result=sprintf("Result = %.2f\n",$num);print "$result"'
 

To store output to a string or variable called $result you need to use the sprintf().

 
#!/usr/bin/perl
$num=585858.64645;
$result = sprintf("%.2f", $num);
$now=sprintf("Today is ".`date`);
print "$result\n";
print "$now\n";
 

Recommend readings:

  1. See perl sprintf() documentation for supported conversions, format parameter, flags etc.
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{ 3 comments… read them below or add one }

1 Peko April 6, 2009 at 2:53 pm

Hi Vivek nixCraft Wizard,
Thanks for your work.

I think there are two bugs.
Shouldn’t “print” instructions be :
print “$result\n”;
print “$now\n”;

instead of using double backslash ?
/* that’s what work on my system *:

– Peko

Reply

2 dg June 17, 2011 at 5:42 pm

@Peko
He probably tried to escape it so it showed up right on the website, but you are correct there should only be one backslash for the newline escape character.

Reply

3 nixCraft June 17, 2011 at 6:21 pm

@dg,

Thanks for the heads up.

Reply

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