Perl参考函数
Perl参考函数,函数学习例子,函数实例代码,函数在线教程等
这是标准的Perl解释器所支持的所有重要函数/功能的列表。在一个函数中找到它的详细信息。
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abs - 绝对值函数
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accept - 接受传入的socket连接
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alarm - 调度一个SIGALRM
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atan2 -Y/X的反正切值,范围在-PI到PI
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bind - 地址绑定到一个套接字
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binmode - 准备二进制文件I / O
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bless - 创建一个对象
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caller - 获取当前子程序调用的上下文
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chdir - 改变当前的工作目录
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chmod - 改变权限的文件列表
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chomp - 从字符串中删除结尾的记录分隔符
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chop - 删除一个字符串的最后一个字符
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chown - 改变文件列表的所有权
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chr - 这个数字代表获得字符
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chroot - 根目录下新建一个路径查找
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close - 关闭文件(或管道或套接字)处理
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closedir - 关闭目录句柄
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connect - 连接到远程套接字
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continue - 可选的结尾块在一段时间内或foreach
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cos - 余弦函数
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crypt - 单向密码式加密
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dbmclose - 中断约束的一道排在并列dbm文件
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dbmopen - 创建绑定一道排在并列dbm文件
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defined - 测试是否为一个值,变量或函数定义或
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delete - 删除从哈希一个值
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die - 抛出一个异常,或摆脱困境(错误)
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do - 打开块转到一个TERM
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dump - 立即创建一个核心转储
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each - 检索下一个键/值对从哈希
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endgrent - 使用组文件
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endhostent - 使用hosts文件
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endnetent - 使用网络文件
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endprotoent - 使用协议文件
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endpwent - 使用passwd文件
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endservent - 使用服务文件
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eof - 测试是否为一个文件结束句柄
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eval - 捕获异常或编译和运行代码
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exec - 放弃此程序运行另一个
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exists - 测试是否存在的哈希键
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exit - 终止这个程序
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exp - 提高I的幂
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fcntl - 文件控制系统调用
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fileno - 从文件句柄,返回的文件描述符
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flock - 与咨询锁锁定整个文件
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fork - 创建一个新的进程,就像这个
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format - 使用write()函数声明的图片格式
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formline - 内部功能的使用格式
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getc - 得到的下一个字符的文件句柄
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getgrent - 下一组记录
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getgrgid - 组记录组用户ID
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getgrnam - 组记录组的名称
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gethostbyaddr - 主机记录其地址
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gethostbyname - 主机记录给定的名称
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gethostent - 获取下一个主机记录
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getlogin -返回谁在这个tty登录
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getnetbyaddr - 网络记录其地址
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getnetbyname - 网络记录给定的名称
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getnetent - 获得下一个的网络记录
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getpeername - 找到套接字连接的另一端
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getpgrp - 获取进程组
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getppid - 父进程ID
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getpriority - 目前的优先值
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getprotobyname - 协议记录给定的名称
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getprotobynumber - 协议记录数字化协议
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getprotoent - 获取下一个协议记录
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getpwent - passwd文件下一个记录
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getpwnam - 获得passwd文件记录用户的登录名
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getpwuid - 获取passwd文件记录用户ID
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getservbyname - 服务记录给它的名字
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getservbyport - 服务记录给定的数字端口
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getservent - 得到下一个服务记录
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getsockname - 对于给定的套接字检索的sockaddr
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getsockopt - 获得在一个给定的socket套接字选项
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glob - 扩大使用通配符的文件名
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gmtime - UNIX时间转换成记录或使用格林威治时间格式的字符串。
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goto - 创建goto代码
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grep - 定位元素列表中的测试是对一个给定的标准
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hex - 将字符串转换为一个十六进制数
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import - patch a module's namespace into your own
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index - find a substring within a string
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int - get the integer portion of a number
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ioctl - system-dependent device control system call
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join - join a list into a string using a separator
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keys - retrieve list of indices from a hash
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kill - send a signal to a process or process group
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last - exit a block prematurely
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lc - return lower-case version of a string
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lcfirst - return a string with just the next letter in lower case
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length - return the number of bytes in a string
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link - create a hard link in the filesytem
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listen - register your socket as a server
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local - create a temporary value for a global variable (dynamic scoping)
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localtime - convert UNIX time into record or string using local time
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lock - get a thread lock on a variable, subroutine, or method
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log - retrieve the natural logarithm for a number
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lstat - stat a symbolic link
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m - match a string with a regular expression pattern
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map - apply a change to a list to get back a new list with the changes
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mkdir - create a directory
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msgctl - SysV IPC message control operations
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msgget - get SysV IPC message queue
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msgrcv - receive a SysV IPC message from a message queue
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msgsnd - send a SysV IPC message to a message queue
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my - declare and assign a local variable (lexical scoping)
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next - iterate a block prematurely
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no - unimport some module symbols or semantics at compile time
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oct - convert a string to an octal number
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open - open a file, pipe, or descriptor
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opendir - open a directory
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ord - find a character's numeric representation
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our - declare and assign a package variable (lexical scoping)
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pack - convert a list into a binary representation
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package - declare a separate global namespace
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pipe - open a pair of connected filehandles
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pop - remove the last element from an array and return it
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pos - find or set the offset for the last/next m//g search
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print - output a list to a filehandle
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printf - output a formatted list to a filehandle
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prototype - get the prototype (if any) of a subroutine
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push - append one or more elements to an array
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q - singly quote a string
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qq - doubly quote a string
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qr - Compile pattern
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quotemeta - quote regular expression magic characters
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qw - quote a list of words
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qx - backquote quote a string
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rand - retrieve the next pseudorandom number
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read - fixed-length buffered input from a filehandle
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readdir - get a directory from a directory handle
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readline - fetch a record from a file
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readlink - determine where a symbolic link is pointing
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readpipe - execute a system command and collect standard output
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recv - receive a message over a Socket
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redo - start this loop iteration over again
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ref - find out the type of thing being referenced
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rename - change a filename
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require - load in external functions from a library at runtime
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reset - clear all variables of a given name
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return - get out of a function early
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reverse - flip a string or a list
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rewinddir - reset directory handle
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rindex - right-to-left substring search
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rmdir - remove a directory
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s - replace a pattern with a string
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scalar - force a scalar context
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seek - reposition file pointer for random-access I/O
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seekdir - reposition directory pointer
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select - reset default output or do I/O multiplexing
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semctl - SysV semaphore control operations
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semget - get set of SysV semaphores
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semop - SysV semaphore operations
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send - send a message over a socket
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setgrent - prepare group file for use
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sethostent - prepare hosts file for use
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setnetent - prepare networks file for use
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setpgrp - set the process group of a process
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setpriority - set a process's nice value
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setprotoent - prepare protocols file for use
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setpwent - prepare passwd file for use
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setservent - prepare services file for use
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setsockopt - set some socket options
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shift - remove the first element of an array, and return it
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shmctl - SysV shared memory operations
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shmget - get SysV shared memory segment identifier
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shmread - read SysV shared memory
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shmwrite - write SysV shared memory
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shutdown - close down just half of a socket connection
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sin - return the sine of a number
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sleep - block for some number of seconds
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socket - create a socket
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socketpair - create a pair of sockets
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sort - sort a list of values
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splice - add or remove elements anywhere in an array
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split - split up a string using a regexp delimiter
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sprintf - formatted print into a string
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sqrt - square root function
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srand - seed the random number generator
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stat - get a file's status information
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study - optimize input data for repeated searches
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sub - declare a subroutine, possibly anonymously
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substr - get or alter a portion of a stirng
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symlink - create a symbolic link to a file
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syscall - execute an arbitrary system call
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sysopen - open a file, pipe, or descriptor
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sysread - fixed-length unbuffered input from a filehandle
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sysseek - position I/O pointer on handle used with sysread and syswrite
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system - run a separate program
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syswrite - fixed-length unbuffered output to a filehandle
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tell - get current seekpointer on a filehandle
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telldir - get current seekpointer on a directory handle
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tie - bind a variable to an object class
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tied - get a reference to the object underlying a tied variable
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time - return number of seconds since 1970
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times - return elapsed time for self and child processes
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tr - transliterate a string
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truncate - shorten a file
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uc - return upper-case version of a string
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ucfirst - return a string with just the next letter in upper case
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umask - set file creation mode mask
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undef - remove a variable or function definition
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unlink - remove one link to a file
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unpack - convert binary structure into normal perl variables
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unshift - prepend more elements to the beginning of a list
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untie - break a tie binding to a variable
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use - load in a module at compile time
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utime - set a file's last access and modify times
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values - return a list of the values in a hash
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vec - test or set particular bits in a string
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wait - wait for any child process to die
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waitpid - wait for a particular child process to die
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wantarray - get void vs scalar vs list context of current subroutine call
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warn - print debugging info
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write - print a picture record
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-X - a file test (-r, -x, etc)
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y - transliterate a string<