abs Math absolute value function
accept Socket accept an incoming socket connect
alarm Process schedule a SIGALRM
-atan2 Math arctangent of Y/X
+atan2 Math arctangent of Y/X in the range -PI to PI
bind Socket binds an address to a socket
-binmode I/O prepare binary files on old systems
+binmode I/O prepare binary files for I/O
bless Objects create an object
caller Flow,Namespace get context of the current subroutine call
chdir File change your current working directory
chroot File make directory new root for path lookups
close I/O close file (or pipe or socket) handle
closedir I/O close directory handle
-connect Socket connect to a remove socket
+connect Socket connect to a remote socket
continue Flow optional trailing block in a while or foreach
cos Math cosine function
crypt String one-way passwd-style encryption
endpwent User be done using passwd file
endservent Network be done using services file
eof I/O test a filehandle for its end
-eval Flow,Misc catch exceptions or compile code
+eval Flow,Misc catch exceptions or compile and run code
exec Process abandon this program to run another
exists HASH test whether a hash key is present
exit Flow terminate this program
exp Math raise I<e> to a power
-fcntl File file control system all
+fcntl File file control system call
fileno I/O return file descriptor from filehandle
flock I/O lock an entire file with an advisory lock
fork Process create a new process just like this one
getnetbyaddr Network get network record given its address
getnetbyname Network get networks record given name
getnetent Network get next networks record
-getpeername Socket find the other hend of a socket connection
+getpeername Socket find the other end of a socket connection
getpgrp Process get process group
getppid Process get parent process ID
getpriority Process get current nice value
listen Socket register your socket as a server
local Misc,Namespace create a temporary value for a global variable (dynamic scoping)
localtime Time convert UNIX time into record or string using local time
+lock Threads get a thread lock on a variable, subroutine, or method
log Math retrieve the natural logarithm for a number
lstat File stat a symbolic link
m// Regexp match a string with a regular expression pattern
next Flow iterate a block prematurely
no Modules unimport some module symbols or semantics at compile time
package Modules,Objects,Namespace declare a separate global namespace
+prototype Flow,Misc get the prototype (if any) of a subroutine
oct String,Math convert a string to an octal number
open File open a file, pipe, or descriptor
opendir File open a directory
quotemeta Regexp quote regular expression magic characters
qw/STRING/ LIST quote a list of words
qx/STRING/ Process backquote quote a string
+qr/PATTERN/ Regexp Compile pattern
rand Math retrieve the next pseudorandom number
read I/O,Binary fixed-length buffered input from a filehandle
readdir I/O get a directory from a directory handle
+readline I/O fetch a record from a file
readlink File determine where a symbolic link is pointing
recv Socket receive a message over a Socket
redo Flow start this loop iteration over again
shmread SysV read SysV shared memory
shmwrite SysV write SysV shared memory
shutdown Socket close down just half of a socket connection
-sin Math return the sin of a number
+sin Math return the sine of a number
sleep Process block for some number of seconds
socket Socket create a socket
socketpair Socket create a pair of sockets
symlink File create a symbolic link to a file
syscall I/O,Binary execute an arbitrary system call
sysread I/O,Binary fixed-length unbuffered input from a filehandle
+sysseek I/O,Binary position I/O pointer on handle used with sysread and syswrite
system Process run a separate program
syswrite I/O,Binary fixed-length unbuffered output to a filehandle
tell I/O get current seekpointer on a filehandle