ELTASK.COM : Open Knowledge Base - PERL. Basic literals.

Name	Desc
abs	absolute value function
accept	accept an incoming socket connect
alarm	schedule a SIGALRM
atan2	arctangent of Y/X in the range -PI to PI
bind	binds an address to a socket
binmode	prepare binary files for I/O
bless	create an object
caller	get context of the current subroutine call
close	close file (or pipe or socket) handle
closedir	close directory handle
connect	connect to a remote socket
continue	optional trailing block in a while or foreach
cos	cosine function
crypt	one-way passwd-style encryption
dbmclose	breaks binding on a tied dbm file
dbmopen	create binding on a tied dbm file
defined	test whether a value, variable, or function is defined or not
	s a value from a hash
die	raise an exception or bail out
do	turn a BLOCK into a TERM
dump	create an immediate core dump
each	retrieve the next key/value pair from a hash
endgrent	be done using group file
endhostent	be done using hosts file
endnetent	be done using networks file
endprotoent	be done using protocols file
endpwent	be done using passwd file
endservent	be done using services file
eof	test a filehandle for its end
eval	catch exceptions or compile and run code
exec	abandon this program to run another
exists	test whether a hash key is present
exit	terminate this program
exp	raise I to a power
fcntl	file control system call
fileno	return file descriptor from filehandle
flock	lock an entire file with an advisory lock
fork	create a new process just like this one
format	declare a picture format with use by the write() function
formline	internal function used for formats
getc	get
getgrent	get next group record
getgrgid	get group record given group user ID
getgrnam	get group record given group name
gethostbyaddr	get host record given its address
gethostbyname	get host record given name
gethostent	get next hosts record
getlogin	return who logged in at this next character from the filehandle
getnetbyaddr	get network record given its address
getnetbyname	get networks record given name
getnetent	get next networks record
getpeername	find the other end of a socket connection
getpgrp	get process group
getppid	get parent process ID
getpriority	get current nice value
getprotobyname	get protocol record given name
getprotobynumber	get protocol record numeric protocol
getprotoent	get next protocols record
getpwent	get next passwd record
getpwnam	get passwd record given user login name
getpwuid	get passwd record given user ID
getservbyname	get services record given its name
getservbyport	get services record given numeric port
getservent	get next services record
getsockname	retrieve the sockaddr for a given socket
getsockopt	get socket options on a given socket
glob	expand filenames using wildcards
gmtime	convert UNIX time into record or string using Greenwich time format.
goto	create spaghetti code
grep	locate elements in a list test true against a given criterion
hex	convert a string to a hexadecimal number
chdir	change your current working directory
chmod	changes the permissions on a list of files
chomp	remove a trailing record separator from a string
chop	remove the last character from a string
chown	change the owership on a list of files
chr	get character this number represents
chroot	make directory new root for path lookups
import	patch a module's namespace into your own
index	find a substring within a string
int	get the integer portion of a number
ioctl	system-dependent device control system call
join	join a list into a string using a separator
keys	retrieve list of indices from a hash
kill	send a signal to a process or process group
last	exit a block prematurely
lc	return lower-case version of a string
lcfirst	return a string with just the next letter in lower case
length	return the number of bytes in a string
link	create a hard link in the filesytem
listen	register your socket as a server
local	create a temporary value for a global variable (dynamic scoping)
localtime	convert UNIX time into record or string using local time
lock	get a thread lock on a variable, subroutine, or method
log	retrieve the natural logarithm for a number
lstat	stat a symbolic link
m	match a string with a regular expression pattern
map	apply a change to a list to get back a new list with the changes
mkdir	create a directory
msgctl	SysV IPC message control operations
msgget	get SysV IPC message queue
msgrcv	receive a SysV IPC message from a message queue
msgsnd	send a SysV IPC message to a message queue
my	declare and assign a local variable (lexical scoping)
next	iterate a block prematurely
no	unimport some module symbols or semantics at compile time
oct	convert a string to an octal number
open	open a file, pipe, or descriptor
opendir	open a directory
ord	find a character's numeric representation
our	declare and assign a package variable (lexical scoping)
pack	convert a list into a binary representation
package	declare a separate global namespace
pipe	open a pair of connected filehandles
pop	remove the last element from an array and return it
pos	find or set the offset for the last/next m//g search
print	output a list to a filehandle
printf	output a formatted list to a filehandle
prototype	get the prototype (if any) of a subroutine
push	append one or more elements to an array
q	singly quote a string
qq	doubly quote a string
qr	Compile pattern
quotemeta	quote regular expression magic characters
qw	quote a list of words
qx	backquote quote a string
rand	retrieve the next pseudorandom number
read	fixed-length buffered input from a filehandle
readdir	get a directory from a directory handle
readline	fetch a record from a file
readlink	determine where a symbolic link is pointing
readpipe	execute a system command and collect standard output
recv	receive a message over a Socket
redo	start this loop iteration over again
ref	find out the type of thing being referenced
rename	change a filename
require	load in external functions from a library at runtime
reset	clear all variables of a given name
return	get out of a function early
reverse	flip a string or a list
rewinddir	reset directory handle
rindex	right-to-left substring search
rmdir	remove a directory
s	replace a pattern with a string
scalar	force a scalar context
seek	reposition file pointer for random-access I/O
seekdir	reposition directory pointer
	reset default output or do I/O multiplexing
semctl	SysV semaphore control operations
semget	get set of SysV semaphores
semop	SysV semaphore operations
send	send a message over a socket
setgrent	prepare group file for use
sethostent	prepare hosts file for use
setnetent	prepare networks file for use
setpgrp	set the process group of a process
setpriority	set a process's nice value
setprotoent	prepare protocols file for use
setpwent	prepare passwd file for use
setservent	prepare services file for use
setsockopt	set some socket options
shift	remove the first element of an array, and return it
shmctl	SysV shared memory operations
shmget	get SysV shared memory segment identifier
shmread	read SysV shared memory
shmwrite	write SysV shared memory
shutdown	close down just half of a socket connection
sin	return the sine of a number
sleep	block for some number of seconds
socket	create a socket
socketpair	create a pair of sockets
sort	sort a list of values
splice	add or remove elements anywhere in an array
split	split up a string using a regexp delimiter
sprintf	formatted print into a string
sqrt	square root function
srand	seed the random number generator
stat	get a file's status information
study	optimize input data for repeated searches
sub	declare a subroutine, possibly anonymously
substr	get or alter a portion of a stirng
symlink	create a symbolic link to a file
syscall	execute an arbitrary system call
sysopen	open a file, pipe, or descriptor
sysread	fixed-length unbuffered input from a filehandle
sysseek	position I/O pointer on handle used with sysread and syswrite
system	run a separate program
syswrite	fixed-length unbuffered output to a filehandle
tell	get current seekpointer on a filehandle
telldir	get current seekpointer on a directory handle
tie	bind a variable to an object class
tied	get a reference to the object underlying a tied variable
time	return number of seconds since 1970
times	return elapsed time for self and child processes
tr	transliterate a string
truncate	shorten a file
uc	return upper-case version of a string
ucfirst	return a string with just the next letter in upper case
umask	set file creation mode mask
undef	remove a variable or function definition
unlink	remove one link to a file
unpack	convert binary structure into normal perl variables
unshift	prepend more elements to the beginning of a list
untie	break a tie binding to a variable
use	load in a module at compile time
utime	set a file's last access and modify times
values	return a list of the values in a hash
vec	test or set particular bits in a string
wait	wait for any child process to die
waitpid	wait for a particular child process to die
wantarray	get void vs scalar vs list context of current subroutine call
warn	print debugging info
write	print a picture record

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