read(n) Tcl (7.5) read(n)
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NAME
read - Read from a channel
SYNOPSIS
read ?-nonewline? channelId
read channelId numBytes
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DESCRIPTION
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 bytes to read. Exactly that
many bytes will be read and returned, unless there are fewer
than numBytes left in the file; in this case all the
remaining bytes are returned.
If channelId is in nonblocking mode, the command may not
read as many bytes as requested: once all available input
has been read, the command will return the data that is
available rather than blocking for more input. 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 manual entry for fconfigure for
details on the -translation option.
SEE ALSO
eof(n), fblocked(n), fconfigure(n)
KEYWORDS
blocking, channel, end of line, end of file, nonblocking,
read, translation
Page 1 (printed 2/19/99)
