read(n) Tcl Built-In Commands read(n)_________________________________________________________________NAMEread - Read from a channel
SYNOPSISread ?-nonewline? channelId
read channelId numBytes
_________________________________________________________________DESCRIPTION
In the first form, the read command reads all of the data
from channelId up to the end of the file. If the -nonew-
line 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 ALSOeof(n), fblocked(n), fconfigure(n)KEYWORDS
blocking, channel, end of line, end of file, nonblocking,
read, translation
Tcl 7.5 1
