NAME<\/a> ______________________________________________________________________________<\/p>\n read \u2212 Read from a channel<\/p>\n read<\/b> ?\u2212nonewline<\/b>? channelId<\/i><\/p>\n read<\/b> channelId numChars<\/i> ______________________________________________________________________________<\/p>\n In the first form, the read<\/b> command reads all of the data from channelId<\/i> up to the end of the file. If the \u2212nonewline<\/b> 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<\/i> 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.<\/p>\n ChannelId<\/i> must be an identifier for an open channel such as the Tcl standard input channel (stdin<\/b>), the return value from an invocation of open<\/b> or socket<\/b>, or the result of a channel creation command provided by a Tcl extension. The channel must have been opened for input.<\/p>\n If channelId<\/i> 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 buffers that do not form a complete character. These bytes will not be returned until a complete character is available or end-of-file is reached. The \u2212nonewline<\/b> switch is ignored if the command returns before reaching the end of the file.<\/p>\n Read<\/b> translates end-of-line sequences in the input into newline characters according to the \u2212translation<\/b> option for the channel. See the fconfigure<\/b> manual entry for a discussion on ways in which fconfigure<\/b> will alter input.<\/p>\n For most applications a channel connected to a serial port should be configured to be nonblocking: fconfigure<\/b> channelId<\/i> \u2212blocking<\/b> 0<\/i>. Then read<\/b> behaves much like described above. Care must be taken when using read<\/b> on blocking serial ports: In this form read<\/b> blocks until numChars<\/i> have been received from the serial port.<\/p>\n read<\/b> channelId<\/i><\/p>\n In this form read<\/b> blocks until the reception of the end-of-file character, see fconfigure \u2212eofchar<\/b>. If there no end-of-file character has been configured for the channel, then read<\/b> will block forever.<\/p>\n This example code reads a file all at once, and splits it into a list, with each line in the file corresponding to an element in the list:<\/p>\n set fl [open \/proc\/meminfo] file(n), eof(n), fblocked(n), fconfigure(n), Tcl_StandardChannels(3)<\/p>\n blocking, channel, end of line, end of file, nonblocking, read, translation, encoding<\/p>\n read \u2212 Read from a channel <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3783,1],"tags":[2635,2307],"class_list":["post-6119","post","type-post","status-publish","format-standard","hentry","category-n-comandos-tcl-tk","category-sin-categoria","tag-mann","tag-read"],"gutentor_comment":0,"_links":{"self":[{"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/posts\/6119","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/comments?post=6119"}],"version-history":[{"count":0,"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/posts\/6119\/revisions"}],"wp:attachment":[{"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/media?parent=6119"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/categories?post=6119"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/tags?post=6119"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
SYNOPSIS<\/a>
DESCRIPTION<\/a>
USE WITH SERIAL PORTS<\/a>
EXAMPLE<\/a>
SEE ALSO<\/a>
KEYWORDS<\/a> <\/p>\n
\nNAME <\/a> <\/h2>\n
SYNOPSIS <\/a> <\/h2>\n
DESCRIPTION <\/a> <\/h2>\n
USE WITH SERIAL PORTS <\/a> <\/h2>\n
read<\/b> channelId numChars<\/i><\/p>\nEXAMPLE <\/a> <\/h2>\n
set data [read<\/b> $fl]
close $fl
set lines [split $data n]<\/p>\nSEE ALSO <\/a> <\/h2>\n
KEYWORDS <\/a> <\/h2>\n
\n","protected":false},"excerpt":{"rendered":"