undef EXPR undef Undefines the value of EXPR, which must be an lvalue. Use only on a scalar value, an array (using @ ), a hash (using % ), a subroutine (using & ), or a typeglob (using * ). Saying undef $hash{$key} will probably not do what you expect on most predefined variables or DBM list values, so don't do that; see delete. Always returns the undefined value. You can omit the EXPR, in which case nothing is undefined, but you still get an undefined value that you could, for instance, re

umask EXPR umask Sets the umask for the process to EXPR and returns the previous value. If EXPR is omitted, merely returns the current umask. The Unix permission rwxr-x--- is represented as three sets of three bits, or three octal digits: 0750 (the leading 0 indicates octal and isn't one of the digits). The umask value is such a number representing disabled permissions bits. The permission (or "mode") values you pass mkdir or sysopen are modified by your umask, so even if you tell sysopen to cr

ucfirst EXPR ucfirst Returns the value of EXPR with the first character in uppercase (titlecase in Unicode). This is the internal function implementing the \u escape in double-quoted strings. If EXPR is omitted, uses $_ . This function behaves the same way under various pragma, such as in a locale, as lc does.

uc EXPR uc Returns an uppercased version of EXPR. This is the internal function implementing the \U escape in double-quoted strings. It does not attempt to do titlecase mapping on initial letters. See ucfirst for that. If EXPR is omitted, uses $_ . This function behaves the same way under various pragma, such as in a locale, as lc does.

truncate FILEHANDLE,LENGTH truncate EXPR,LENGTH Truncates the file opened on FILEHANDLE, or named by EXPR, to the specified length. Raises an exception if truncate isn't implemented on your system. Returns true if successful, undef on error. The behavior is undefined if LENGTH is greater than the length of the file. The position in the file of FILEHANDLE is left unchanged. You may want to call seek before writing to the file. Portability issues: truncate in perlport.

tr/// The transliteration operator. Same as y///. See Quote-Like Operators in perlop.

times Returns a four-element list giving the user and system times in seconds for this process and any exited children of this process. ($user,$system,$cuser,$csystem) = times; In scalar context, times returns $user . Children's times are only included for terminated children. Portability issues: times in perlport.

NAME SYNOPSIS DESCRIPTION AUTHOR NAME Time::tm - internal object used by Time::gmtime and Time::localtime SYNOPSIS Don't use this module directly. DESCRIPTION This module is used internally as a base class by Time::localtime And Time::gmtime functions. It creates a Time::tm struct object which is addressable just like's C's tm structure from time.h; namely with sec, min, hour, mday, mon, year, wday, yday, and isdst. This class is an internal interface only. AUTHOR Tom Christiansen

NAME SYNOPSIS DESCRIPTION METHODS AUTHOR COPYRIGHT AND LICENSE Bugs NAME Time::Seconds - a simple API to convert seconds to other date values SYNOPSIS use Time::Piece; use Time::Seconds; my $t = localtime; $t += ONE_DAY; my $t2 = localtime; my $s = $t - $t2; print "Difference is: ", $s->days, "\n"; DESCRIPTION This module is part of the Time::Piece distribution. It allows the user to find out the number of minutes, hours, days, weeks or years in a given number of seconds. It is returne

NAME SYNOPSIS DESCRIPTION USAGELocal Locales Date Calculations Date Comparisons Date Parsing YYYY-MM-DDThh:mm:ss Week Number Global Overriding CAVEATSSetting $ENV{TZ} in Threads on Win32 Use of epoch seconds AUTHOR COPYRIGHT AND LICENSE SEE ALSO BUGS NAME Time::Piece - Object Oriented time objects SYNOPSIS use Time::Piece; my $t = localtime; print "Time is $t\n"; print "Year is ", $t->year, "\n"; DESCRIPTION This module replaces the standard localtime and gmtime functions with implem