NAME<\/a> ______________________________________________________________________________<\/p>\n tell \u2212 Return current access position for an open channel<\/p>\n tell<\/b> channelId<\/i> ______________________________________________________________________________<\/p>\n Returns an integer string giving the current access position in channelId<\/i>. This value returned is a byte offset that can be passed to seek<\/b> in order to set the channel to a particular position. Note that this value is in terms of bytes, not characters like read<\/b>. The value returned is -1 for channels that do not support seeking.<\/p>\n ChannelId<\/i> must be an identifier for an open channel such as a Tcl standard channel (stdin<\/b>, stdout<\/b>, or stderr<\/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.<\/p>\n Read a line from a file channel only if it starts with foobar<\/b>:<\/p>\n # Save the offset in case we need to undo the read… file(n), open(n), close(n), gets(n), seek(n), Tcl_StandardChannels(3)<\/p>\n access position, channel, seeking<\/p>\n tell \u2212 Return current access position for an open 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":[2635,2964],"class_list":["post-6408","post","type-post","status-publish","format-standard","hentry","category-n-comandos-tcl-tk","category-sin-categoria","tag-mann","tag-tell"],"gutentor_comment":0,"_links":{"self":[{"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/posts\/6408","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=6408"}],"version-history":[{"count":0,"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/posts\/6408\/revisions"}],"wp:attachment":[{"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/media?parent=6408"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/categories?post=6408"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/tags?post=6408"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
SYNOPSIS<\/a>
DESCRIPTION<\/a>
EXAMPLE<\/a>
SEE ALSO<\/a>
KEYWORDS<\/a> <\/p>\n
\nNAME <\/a> <\/h2>\n
SYNOPSIS <\/a> <\/h2>\n
DESCRIPTION <\/a> <\/h2>\n
EXAMPLE <\/a> <\/h2>\n
set offset [tell<\/b> $chan]
if {[read $chan 6] eq “foobar”} {
gets $chan line
} else {
set line {}
# Undo the read…
seek $chan $offset
}<\/p>\nSEE ALSO <\/a> <\/h2>\n
KEYWORDS <\/a> <\/h2>\n
\n","protected":false},"excerpt":{"rendered":"