07-27-2010
Quote:
Originally Posted by
scottn
Not so much because it's in an if statement, more that it's in a shell script (presumably not a C-shell script, otherwise the [ ] won't work anyway).
In many languages, you're right that = is used for assignment, and == for comparison. In shell = is used for both.
oh ok, so its more about the context its used in rather than having one concrete meaning?
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~
~
~
~
~
~
~
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LEARN ABOUT MOJAVE
number::compare
Number::Compare(3) User Contributed Perl Documentation Number::Compare(3)
NAME
Number::Compare - numeric comparisons
SYNOPSIS
Number::Compare->new(">1Ki")->test(1025); # is 1025 > 1024
my $c = Number::Compare->new(">1M");
$c->(1_200_000); # slightly terser invocation
DESCRIPTION
Number::Compare compiles a simple comparison to an anonymous subroutine, which you can call with a value to be tested again.
Now this would be very pointless, if Number::Compare didn't understand magnitudes.
The target value may use magnitudes of kilobytes ("k", "ki"), megabytes ("m", "mi"), or gigabytes ("g", "gi"). Those suffixed with an "i"
use the appropriate 2**n version in accordance with the IEC standard: http://physics.nist.gov/cuu/Units/binary.html
METHODS
->new( $test )
Returns a new object that compares the specified test.
->test( $value )
A longhanded version of $compare->( $value ). Predates blessed subroutine reference implementation.
->parse_to_perl( $test )
Returns a perl code fragment equivalent to the test.
AUTHOR
Richard Clamp <richardc@unixbeard.net>
COPYRIGHT
Copyright (C) 2002,2011 Richard Clamp. All Rights Reserved.
This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
SEE ALSO
http://physics.nist.gov/cuu/Units/binary.html
perl v5.18.2 2011-09-21 Number::Compare(3)