shutdown SOCKET,HOW Shuts down a socket connection in the manner indicated by HOW, which has the same interpretation as in the syscall of the same name. shutdown(SOCKET, 0); # I/we have stopped reading data shutdown(SOCKET, 1); # I/we have stopped writing data shutdown(SOCKET, 2); # I/we have stopped using this socket This is useful with sockets when you want to tell the other side you're done writing but not done reading, or vice versa. It's also a more insistent form of close becaus

NAME SYNOPSIS OPTIONS AND ARGUMENTS DESCRIPTION SEE ALSO AUTHOR NAME podselect - print selected sections of pod documentation on standard output SYNOPSIS podselect [-help] [-man] [-section section-spec] [file ...] OPTIONS AND ARGUMENTS -help Print a brief help message and exit. -man Print the manual page and exit. -section section-spec Specify a section to include in the output. See SECTION SPECIFICATIONS in Pod::Parser for the format to use for section-spec. This option may be given mul

NAME SYNOPSIS DESCRIPTION SEE ALSO AUTHOR NAME DBM_Filter::encode - filter for DBM_Filter SYNOPSIS use SDBM_File; # or DB_File, GDBM_File, NDBM_File, ODBM_File use DBM_Filter ; $db = tie %hash, ... $db->Filter_Push('encode' => 'iso-8859-16'); DESCRIPTION This DBM filter allows you to choose the character encoding will be store in the DBM file. The usage is $db->Filter_Push('encode' => ENCODING); where "ENCODING" must be a valid encoding name that the Encode module recognises. A

getpgrp PID Returns the current process group for the specified PID. Use a PID of 0 to get the current process group for the current process. Will raise an exception if used on a machine that doesn't implement getpgrp(2). If PID is omitted, returns the process group of the current process. Note that the POSIX version of getpgrp does not accept a PID argument, so only PID==0 is truly portable. Portability issues: getpgrp in perlport.

NAME SYNOPSIS DESCRIPTION LICENSE NAME CPAN::Version - utility functions to compare CPAN versions SYNOPSIS use CPAN::Version; CPAN::Version->vgt("1.1","1.1.1"); # 1 bc. 1.1 > 1.001001 CPAN::Version->vlt("1.1","1.1"); # 0 bc. 1.1 not < 1.1 CPAN::Version->vcmp("1.1","1.1.1"); # 1 bc. first is larger CPAN::Version->vcmp("1.1.1","1.1"); # -1 bc. first is smaller CPAN::Version->readable(v1.2.3); # "v1.2.3" CPAN::Version->vstring("v1.2.3"); # v1.2.

List Operators (Rightward) On the right side of a list operator, the comma has very low precedence, such that it controls all comma-separated expressions found there. The only operators with lower precedence are the logical operators "and" , "or" , and "not" , which may be used to evaluate calls to list operators without the need for parentheses: open HANDLE, "< :utf8", "filename" or die "Can't open: $!\n"; However, some people find that code harder to read than writing it with parentheses

sysread FILEHANDLE,SCALAR,LENGTH,OFFSET sysread FILEHANDLE,SCALAR,LENGTH Attempts to read LENGTH bytes of data into variable SCALAR from the specified FILEHANDLE, using the read(2). It bypasses buffered IO, so mixing this with other kinds of reads, print, write, seek, tell, or eof can cause confusion because the perlio or stdio layers usually buffers data. Returns the number of bytes actually read, 0 at end of file, or undef if there was an error (in the latter case $! is also set). SCALAR will

substr EXPR,OFFSET,LENGTH,REPLACEMENT substr EXPR,OFFSET,LENGTH substr EXPR,OFFSET Extracts a substring out of EXPR and returns it. First character is at offset zero. If OFFSET is negative, starts that far back from the end of the string. If LENGTH is omitted, returns everything through the end of the string. If LENGTH is negative, leaves that many characters off the end of the string. my $s = "The black cat climbed the green tree"; my $color = substr $s, 4, 5; # black my $middle = substr

tell FILEHANDLE tell Returns the current position in bytes for FILEHANDLE, or -1 on error. FILEHANDLE may be an expression whose value gives the name of the actual filehandle. If FILEHANDLE is omitted, assumes the file last read. Note the in bytes: even if the filehandle has been set to operate on characters (for example by using the :encoding(utf8) open layer), tell() will return byte offsets, not character offsets (because that would render seek() and tell() rather slow). The return value of

hex EXPR hex Interprets EXPR as a hex string and returns the corresponding value. (To convert strings that might start with either 0 , 0x , or 0b, see oct.) If EXPR is omitted, uses $_ . print hex '0xAf'; # prints '175' print hex 'aF'; # same Hex strings may only represent integers. Strings that would cause integer overflow trigger a warning. Leading whitespace is not stripped, unlike oct(). To present something as hex, look into printf, sprintf, and unpack.