perl 函数

函数

Perl提供了可以直接调用的、数目众多的函数。可以对以下对象进行操作：

* 数组: chomp, join, keys, map, pop, push, reverse, shift, sort, splice, split, unshift, values

* 数据库: dbmclose, dbmopen

* 目录: chdir, closedir, mkdir, opendir, readdir, rewinddir, rmdir, seekdir, telldir

* 文件: binmode, chdir, chmod, chown, chroot, close, eof, fnctl, fileno, flock, getc, glob, ioctl, link, lstat, open, 
print, printf, read, readdir, readlink, rename, rmdir, seek, select, stat, symlink, sysopen, sysread, syswrite, tell, 
truncate, umask, unlink, utime, write

* 组: endgrent, getgrent, getgrgid, getgrname, getpgrp, setgrent, setpgrp

* 哈希表: delete, each, exists, keys, values

* 主机: endhostent, gethostbyaddr, gethostbyname, sethostent

* 输入: getc, read, sysread

* 处理器间通讯: msgctl, msgget, msgrcv, msgsnd, pipe, semctl, semget, semop, shmctl, shmget, shmread, shmwrite

* 数学: abs, atan2, cos, exp, hex, int, log, oct, rand, sin, sqrt, srand

* 消息队列: msgctl, msgget, msgrcv, msgsnd

* 其他: bless, defined, do, eval, formline, import, ref, scalar, syscall, tie, tied, undef, untie, wantarray

* 网络: endnetent, getnetbyaddr, getnetbyname, getnetent, setnetent

* 输出: die, print, printf, syswrite, warn, write

* 口令: endpwent, getpwent, getpwname, getpwuid, setpwent

* 进程: alarm, die, dump, exec, exit, fork, getlogin, getpgrp, getppid, getpriority, kill, setpriority, sleep, system, 
times, umask, wait, waitpid

* 协议: endprotent, getprotobyname, getprotobynumber, getprotoent, getservbyname, getservbyport, getservent, setprotoent

* 正则表达式: grep, pos, quotemeta, reset, split, study

* 范围: caller, local, my

* 服务: endservent, getservbyname, getservbyport, getservent, setservent

* 套节字: accept, bind, connect, gethostbyaddr, gethostbyname, gethostent, getpeername, getservbyname, getservbyport, 
getservent, getsockname, getsockopt, listen, recv, select, send, setsockopt, shutdown, socket, socketpair

* 字符串: chop, chr, crypt, hex, index, join, lc, lcfirst, length, oct, Ord, pack, q, qq, quotemeta, qw, qx, reverse, 
rindex, split, sprintf, substr, uc, ucfirst, unpack, vec

* 时间: gmtime, localtime, time

* UNIX: chmod, chown, chroot, dump, endgrent, endhostent, endnetent, endprotent, endpwent, endservent, fnctl, fork,
getgrent, getgrgid, getgrname, gethostent, getlogin, getnetent, getpgrp, getppid, getpriority, getprotobyname, 
getprotobynumber, getprotoent, getpwent, getpwname, getpwuid, getservbyname, getservbyport, getservent, ioctl, link, 
lstat, readlink, select, setgrent, sethostent, setnetent, setpgrp, setpriority, setprotoent, setpwent, setservent, 
sleep, syscall, times, umask, wait, waitpid