関数一覧
Perlの組み込み関数は全部で200個程度しかない。
それ以外のことをしたい場合にはCPAN(Comprehensive Perl Archive Network)などからライブラリをダウンロードしたりします。
関数名 | カテゴリ | 説明 |
---|---|---|
-X | File | a file test (-r, -x, etc) |
abs | Math | absolute value function |
accept | Socket | accept an incoming socket connect |
alarm | Process | schedule a SIGALRM |
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 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 |
chmod | File | changes the permissions on a list of files |
chomp | String | remove a trailing record separator from a string |
chop | String | remove the last character from a string |
chown | File | change the owership on a list of files |
chr | String | get character this number represents |
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 remote socket |
continue | Flow | optional trailing block in a while or foreach |
cos | Math | cosine function |
crypt | String | one-way passwd-style encryption |
dbmclose | Objects,I/O | breaks binding on a tied dbm file |
dbmopen | Objects,I/O | create binding on a tied dbm file |
defined | Misc | test whether a value, variable, or function is defined |
delete | HASH | deletes a value from a hash |
die | I/O,Flow | raise an exception or bail out |
do | Flow,Modules | turn a BLOCK into a TERM |
dump | Misc,Flow | create an immediate core dump |
each | HASH | retrieve the next key/value pair from a hash |
endgrent | User | be done using group file |
endhostent | User | be done using hosts file |
endnetent | User | be done using networks file |
endprotoent | Network | be done using protocols file |
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 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 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 |
format | I/O | declare a picture format with use by the write() function |
formline | Misc | internal function used for formats |
getc | I/O | get the next character from the filehandle |
getgrent | User | get next group record |
getgrgid | User | get group record given group user ID |
getgrnam | User | get group record given group name |
gethostbyaddr | Network | get host record given its address |
gethostbyname | Network | get host record given name |
gethostent | Network | get next hosts record |
getlogin | User | return who logged in at this tty |
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 end of a socket connection |
getpgrp | Process | get process group |
getppid | Process | get parent process ID |
getpriority | Process | get current nice value |
getprotobyname | Network | get protocol record given name |
getprotobynumber | Network | get protocol record numeric protocol |
getprotoent | Network | get next protocols record |
getpwent | User | get next passwd record |
getpwnam | User | get passwd record given user login name |
getpwuid | User | get passwd record given user ID |
getservbyname | Network | get services record given its name |
getservbyport | Network | get services record given numeric port |
getservent | Network | get next services record |
getsockname | Socket | retrieve the sockaddr for a given socket |
getsockopt | Socket | get socket options on a given socket |
glob | File | expand filenames using wildcards |
gmtime | Time | convert UNIX time into record or string using Greenwich time |
goto | Flow | create spaghetti code |
grep | LIST | locate elements in a list test true against a given criterion |
hex | Math,String | convert a string to a hexadecimal number |
import | Modules,Namespace | patch a module's namespace into your own |
index | String | find a substring within a string |
int | Math | get the integer portion of a number |
ioctl | File | system-dependent device control system call |
join | LIST | join a list into a string using a separator |
keys | HASH | retrieve list of indices from a hash |
kill | Process | send a signal to a process or process group |
last | Flow | exit a block prematurely |
lc | String | return lower-case version of a string |
lcfirst | String | return a string with just the next letter in lower case |
length | String | return the number of bytes in a string |
link | File | create a hard link in the filesytem |
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 |
map | LIST | apply a change to a list to get back a new list with the changes |
mkdir | File | create a directory |
msgctl | SysV | SysV IPC message control operations |
msgget | SysV | get SysV IPC message queue |
msgrcv | SysV | receive a SysV IPC message from a message queue |
msgsnd | SysV | send a SysV IPC message to a message queue |
my | Misc,Namespace | declare and assign a local variable (lexical scoping) |
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 |
ord | String | find a character's numeric representation |
our | Misc,Namespace | declare and assign a package variable (lexical scoping) |
pack | Binary,String | convert a list into a binary representation |
pipe | Process | open a pair of connected filehandles |
pop | ARRAY | remove the last element from an array and return it |
pos | Regexp | find or set the offset for the last/next m//g search |
I/O | output a list to a filehandle | |
printf | I/O | output a formatted list to a filehandle |
push | ARRAY | append one or more elements to an array |
q/STRING/ | String | singly quote a string |
qq/STRING/ | String | doubly quote a string |
quotemeta | Regexp | quote regular expression magic characters |
qw/STRING/ | LIST | quote a list of words |
qx/STRING/ | Process | backquote quote a string |
qr/STRING/ | 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 |
readpipe | Process | execute a system command and collect standard output |
recv | Socket | receive a message over a Socket |
redo | Flow | start this loop iteration over again |
ref | Objects | find out the type of thing being referenced |
rename | File | change a filename |
require | Modules | load in external functions from a library at runtime |
reset | Misc | clear all variables of a given name |
return | Flow | get out of a function early |
reverse | String,LIST | flip a string or a list |
rewinddir | I/O | reset directory handle |
rindex | String | right-to-left substring search |
rmdir | File | remove a directory |
s/// | Regexp | replace a pattern with a string |
scalar | Misc | force a scalar context |
seek | I/O | reposition file pointer for random-access I/O |
seekdir | I/O | reposition directory pointer |
select | I/O | reset default output or do I/O multiplexing |
semctl | SysV | SysV semaphore control operations |
semget | SysV | get set of SysV semaphores |
semop | SysV | SysV semaphore operations |
send | Socket | send a message over a socket |
setgrent | User | prepare group file for use |
sethostent | Network | prepare hosts file for use |
setnetent | Network | prepare networks file for use |
setpgrp | Process | set the process group of a process |
setpriority | Process | set a process's nice value |
setprotoent | Network | prepare protocols file for use |
setpwent | User | prepare passwd file for use |
setservent | Network | prepare services file for use |
setsockopt | Socket | set some socket options |
shift | ARRAY | remove the first element of an array, and return it |
shmctl | SysV | SysV shared memory operations |
shmget | SysV | get SysV shared memory segment identifier |
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 sine of a number |
sleep | Process | block for some number of seconds |
socket | Socket | create a socket |
socketpair | Socket | create a pair of sockets |
sort | LIST | sort a list of values |
splice | ARRAY | add or remove elements anywhere in an array |
split | Regexp | split up a string using a regexp delimiter |
sprintf | String | formatted print into a string |
sqrt | Math | square root function |
srand | Math | seed the random number generator |
stat | File | get a file's status information |
study | Regexp | optimize input data for repeated searches |
sub | Flow | declare a subroutine, possibly anonymously |
substr | String | get or alter a portion of a stirng |
symlink | File | create a symbolic link to a file |
syscall | I/O,Binary | execute an arbitrary system call |
sysopen | File | open a file, pipe, or descriptor |
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 |
telldir | I/O | get current seekpointer on a directory handle |
tie | Objects | bind a variable to an object class |
tied | Objects | get a reference to the object underlying a tied variable |
time | Time | return number of seconds since 1970 |
times | Process,Time | return elapsed time for self and child processes |
tr/// | String | transliterate a string |
truncate | I/O | shorten a file |
uc | String | return upper-case version of a string |
ucfirst | String | return a string with just the next letter in upper case |
umask | File | set file creation mode mask |
undef | Misc | remove a variable or function definition |
unlink | File | remove one link to a file |
unpack | Binary,LIST | convert binary structure into normal perl variables |
unshift | ARRAY | prepend more elements to the beginning of a list |
untie | Objects | break a tie binding to a variable |
use | Modules,Namespace | load a module and import its namespace |
use | Objects | load in a module at compile time |
utime | File | set a file's last access and modify times |
values | HASH | return a list of the values in a hash |
vec | Binary | test or set particular bits in a string |
wait | Process | wait for any child process to die |
waitpid | Process | wait for a particular child process to die |
wantarray | Misc,Flow | get void vs scalar vs list context of current subroutine call |
warn | I/O | print debugging info |
write | I/O | print a picture record |
y/// | String | transliterate a string |
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