PERL Function Reference

R
rand	retrieve the next pseudorandom number
read	fixed-length buffered input from a filehandle
readdir	get a directory from a directory handle
readlink	determine where a symbolic link is pointing
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
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
select	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 sin 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
sysread	fixed-length unbuffered input from a filehandle
system	run a separate program
syswrite	fixed-length unbuffered output to a filehandle
T
tell	get current seekpointer on a filehandle
telldir	get current seekpointer on a directory handle
tie	bind a variable to an object class
time	return number of seconds since 1970
times	return elapsed time for self and child processes
tr///	transliterate a string
truncate	shorten a file
U
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
V
values	return a list of the values in a hash
vec	test or set particular bits in a string
W
wait	wait for any child process to die
waitpid	wait for a particular child process to die
wantarray	get list vs array context of current subroutine call
warn	print debugging info
write	print a picture record
X
Y
y///	transliterate a string
Z