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Functions

sysseek - position I/O pointer on handle used with sysread and syswrite

The values for WHENCE are 0 to set the new position to POSITION; 1 to set the it to the current position ... " function: use Fcntl 'SEEK_CUR'; sub systell { sysseek($_[0], 0, SEEK_CUR) } Returns the new

link OLDFILE,NEWFILE Creates a new filename linked to the old filename.

write - print a picture record

record, the page is advanced by writing a form feed, a special top-of-page format is used to format the new ... The number of lines remaining on the current page is in variable $-, which can be set to 0 to force a new

symlink OLDFILE,NEWFILE Creates a new filename symbolically linked to the old filename.

tie - bind a variable to an object class

Any additional arguments are passed to the new method of the class (meaning TIESCALAR, TIEHANDLE, TIEARRAY ... The object returned by the new method is also returned by the tie function, which would be useful if

join - join a list into a string using a separator

separate strings of LIST into a single string with fields separated by the value of EXPR, and returns that new

chroot - make directory new root for path lookups

chroot This function works like the system call by the same name: it makes the named directory the new

opendir - open a directory

an undefined scalar variable (or array or hash element), the variable is assigned a reference to a new

sort - sort a list of values

$1 : undef ); push @caps, uc($_); } my @new = @old[ sort { $nums[$b] <=> $nums ... $#old ]; # same thing, but without any temps @new = map { $_->[0] } sort { $b

unshift - prepend more elements to the beginning of a list

Prepends list to the front of the array and returns the new number of elements in the array.

die - raise an exception or bail out

\n" unless chdir '/usr/spool/news'; chdir '/usr/spool/news' or die "Can't cd to spool: $! ... Here's an example: use Scalar::Util "blessed"; eval { ... ; die Some::Module::Exception->new

dump - create an immediate core dump

When the new binary is executed it will begin by executing a goto LABEL (with all the restrictions that

reverse - flip a string or a list

Also, this has to unwind one hash and build a whole new one, which may take some time on a large hash

crypt - one-way passwd-style encryption

This ensures crypt() will hash the new string with the same salt as the digest. ... When choosing a new salt create a random two character string whose characters come from the set [./0

fork - create a new process just like this one

fork Does a fork(2) system call to create a new process running the same program at the same point

dbmopen - create binding on a tied dbm file

Example: # print out history file offsets dbmopen(%HIST,'/usr/lib/news/history',0666); while

alarm - schedule a SIGALRM

previous timer, and an argument of 0 may be supplied to cancel the previous timer without starting a new

seek - reposition file pointer for random-access I/O

The values for WHENCE are 0 to set the new position in bytes to POSITION; 1 to set it to the current

require - load in external functions from a library at runtime

Here is a typical code layout: # In Foo.pm package Foo; sub new { ... } sub Foo::INC ... my ($self, $filename) = @_; ... } # In the main program push @INC, Foo->new

sysopen - open a file, pipe, or descriptor

do not work under OS/390 & VM/ESA Unix and on the Macintosh; you probably don't want to use them in new

caller - get context of the current subroutine call

$hasargs is true if a new instance of @_ was set up for the frame.

select - reset default output or do I/O multiplexing

If FILEHANDLE is supplied, sets the new current default filehandle for output.

open - open a file, pipe, or descriptor

If FILEHANDLE is an undefined scalar variable (or array or hash element), a new filehandle is autovivified ... In the child process, the filehandle isn't opened--I/O happens from/to the new STDOUT/STDIN.

flock - lock an entire file with an advisory lock

emulation, by passing the switch -Ud_flock to the Configure program when you configure and build a new

binmode - prepare binary files for I/O

All variants of Unix, Mac OS (old and new), and Stream_LF files on VMS use a single character to end

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