53 lines
1.7 KiB
Plaintext
53 lines
1.7 KiB
Plaintext
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'\"
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'\" Copyright (c) 1993 The Regents of the University of California.
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'\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
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'\"
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'\" See the file "license.terms" for information on usage and redistribution
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'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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'\"
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'\" SCCS: @(#) read.n 1.14 96/02/15 20:02:29
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'\"
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.so man.macros
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.TH read n 7.5 Tcl "Tcl Built-In Commands"
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.BS
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'\" Note: do not modify the .SH NAME line immediately below!
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.SH NAME
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read \- Read from a channel
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.SH SYNOPSIS
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\fBread \fR?\fB\-nonewline\fR? \fIchannelId\fR
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.sp
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\fBread \fIchannelId numBytes\fR
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.BE
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.SH DESCRIPTION
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.PP
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In the first form, the \fBread\fR command reads all of the data from
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\fIchannelId\fR up to the end of the file.
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If the \fB\-nonewline\fR switch is specified then the last character
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of the file is discarded if it is a newline.
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In the second form, the extra argument specifies how many bytes to
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read. Exactly that many bytes will be read and returned, unless
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there are fewer than \fInumBytes\fR left in the file; in this case
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all the remaining bytes are returned.
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.PP
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.VS
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If \fIchannelId\fR is in nonblocking mode, the command may not read
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as many bytes as requested: once all available input has been read,
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the command will return the data that is available rather than blocking
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for more input.
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The \fB\-nonewline\fR switch is ignored if the command returns
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before reaching the end of the file.
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.PP
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\fBRead\fR translates end-of-line sequences in the input into
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newline characters according to the \fB\-translation\fR option
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for the channel.
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See the manual entry for \fBfconfigure\fR for details on the
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\fB\-translation\fR option.
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.VE
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.SH "SEE ALSO"
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eof(n), fblocked(n), fconfigure(n)
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.SH KEYWORDS
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blocking, channel, end of line, end of file, nonblocking, read, translation
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