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RedHat 9 (Linux i386) - man page for read (redhat section n)

read(n) 			      Tcl Built-In Commands				  read(n)


       read - Read from a channel

       read ?-nonewline? channelId

       read channelId numChars

       In  the first form, the read command reads all of the data from channelId up to the end of
       the file.  If the -nonewline switch is specified then the last character of  the  file  is
       discarded  if  it is a newline.	In the second form, the extra argument specifies how many |
       characters to read.  Exactly that many characters will be read and returned, unless  there |
       are  fewer  than numChars left in the file;  in this case all the remaining characters are |
       returned.  If the channel is configured to use a multi-byte encoding, then the  number  of |
       characters read may not be the same as the number of bytes read. 			  |

       If  channelId  is  in  nonblocking  mode,  the  command may not read as many characters as |
       requested: once all available input has been read, the command will return the  data  that |
       is  available  rather than blocking for more input.  If the channel is configured to use a |
       multi-byte encoding, then there may actually be some bytes remaining in the internal  buf- |
       fers that do not form a complete character.  These bytes will not be returned until a com- |
       plete character is available or end-of-file is reached.	The -nonewline switch is  ignored
       if the command returns before reaching the end of the file.

       Read  translates  end-of-line  sequences in the input into newline characters according to
       the -translation option for the channel.  See the fconfigure manual entry for a discussion
       on ways in which fconfigure will alter input.

       file(n), eof(n), fblocked(n), fconfigure(n)

       blocking, channel, end of line, end of file, nonblocking, read, translation, encoding

Tcl					       8.1					  read(n)

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