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Full Discussion: check if a string is numeric
Top Forums Shell Programming and Scripting check if a string is numeric Post 302572638 by vgersh99 on Thursday 10th of November 2011 12:20:52 PM
Old 11-10-2011
Quote:
Originally Posted by Corona688
Since you have the Korn shell you can do this:

Code:
[ ! -z "$VAR" -a -z "${VAR/[0-9]*/}" ] && echo "$VAR is all-numeric"

I think the OP wanted to cover the floats as well as the ints.
 

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Format::Human::Bytes(3pm)				User Contributed Perl Documentation				 Format::Human::Bytes(3pm)

NAME
Format::Human::Bytes - Format a bytecount and make it human readable VERSION
Version 0.05 SYNOPSIS
Ever showed 12345678 bytes to the user instead of just saying 11MB? This module returns you a printable string which is more readable by humans than a simple bytecount. use Format::Human::Bytes; $readable = Format::Human::Bytes::base2($bytecount[,$decimals]); $readable = Format::Human::Bytes::base10($bytecount[,$decimals]); $readable = Format::Human::Bytes->base2($bytecount[,$decimals]); $readable = Format::Human::Bytes->base10($bytecount[,$decimals]); my $fhb = Format::Human::Bytes->new(); $readable = $fhb->base2($bytecount[,$decimals]); $readable = $fhb->base10($bytecount[,$decimals]); All functions do "intelligent" switching to the next unit, for example: 1000 => 1000B [...] 8000 => 8000B 9000 => 9kB The difference between 1000 bytes and 1500 bytes is usually bigger (for example because of a slow link) than between 95kB and 95,5kB. The same applies to 8000kB vs. 9 MB and for the other units. Depending on your usage, you may want to specify how many decimals should be shown (defaults to no decimals). FUNCTIONS
/ METHODS new my $fhb = Format::Human::Bytes->new(); Creates and returns a Format::Human::Bytes - object. base2 Callable as a function: $readable = Format::Human::Bytes::base2($bytecount[,$decimals]); Callable as a class method: $readable = Format::Human::Bytes->base2($bytecount[,$decimals]); Callable as a object method: $readable = $fhb->base2($bytecount[,$decimals]); Returns the correct readable form of the given bytecount. Correct in this case means that 1kB are 1024 Bytes which is how computers see the world. If you specify a decimal parameter, the result number will have the number of decimal numbers you specified. base10 Callable as a function: $readable = Format::Human::Bytes::base10($bytecount[,$decimals]); Callable as a class method: $readable = Format::Human::Bytes->base10($bytecount[,$decimals]); Callable as a object method: $readable = $fhb->base10($bytecount[,$decimals]); Returns the incorrect readable form of the given bytecount. Incorrect in this case means that 1kB is 1000 Bytes and 1 MB is 1000000 bytes which is how some (many) people see the world, but it's wrong for computers. If you specify a decimal parameter, the result number will have the number of decimal numbers you specified. AUTHOR
Sebastian Willing, "<sewi at cpan.org>" BUGS
Please report any bugs or feature requests to "bug-format-human-bytes at rt.cpan.org", or through the web interface at <http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Format-Human-Bytes>. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes. SUPPORT
You can find documentation for this module with the perldoc command. perldoc Format::Human::Bytes You can also look for information at: o RT: CPAN's request tracker <http://rt.cpan.org/NoAuth/Bugs.html?Dist=Format-Human-Bytes> o AnnoCPAN: Annotated CPAN documentation <http://annocpan.org/dist/Format-Human-Bytes> o CPAN Ratings <http://cpanratings.perl.org/d/Format-Human-Bytes> o Search CPAN <http://search.cpan.org/dist/Format-Human-Bytes/> HISTORY
The functions are in use since late 2003 or early 2004 but I didn't pack them for CPAN before 2009. LICENSE
This program is free software; you can redistribute it and/or modify it under the same terms as Perl 5 itself. perl v5.10.1 2010-04-08 Format::Human::Bytes(3pm)
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