Placed in () when used with if, while, etc...
Any expression is considered true as long as it does not evaluate to the null string ("") or 0 or "0".
Common: http://www.perldoc.com/perl5.6/pod/perlop.html
``lt'', ``le'', ``ge'', ``gt'' and ``cmp'' use the collation (sort) order specified by the current locale if use locale is in effect. See the perllocale manpage.
File-test operators http://www.perldoc.com/perl5.6/pod/func/X.html
Example:
while (<>) { chop; next unless -f $_; # ignore specials #... }
Example:
print "Can do.\n" if -r $a || -w _ || -x _;
stat($filename); print "Readable\n" if -r _; print "Writable\n" if -w _; print "Executable\n" if -x _;
See also:
Uppercase operators (e.g. EQ instead of eq) used to be ok, but they aren't anymore. They cause "bareword found where operator expected" errors as of perl version 5. +
file: /Techref/language/perl/condition.htm, 4KB, , updated: 2009/12/29 16:47, local time: 2024/8/21 22:37,
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