Query: tell
OS: debian
Section: 3tcl
Format: Original Unix Latex Style Formatted with HTML and a Horizontal Scroll Bar
tell(3tcl) Tcl Built-In Commands tell(3tcl) __________________________________________________________________________________________________________________________________________________NAMEtell - Return current access position for an open channelSYNOPSIStell channelId _________________________________________________________________DESCRIPTIONReturns an integer string giving the current access position in channelId. This value returned is a byte offset that can be passed to seek in order to set the channel to a particular position. Note that this value is in terms of bytes, not characters like read. The value returned is -1 for channels that do not support seeking. ChannelId must be an identifier for an open channel such as a Tcl standard channel (stdin, stdout, or stderr), the return value from an invocation of open or socket, or the result of a channel creation command provided by a Tcl extension.EXAMPLERead a line from a file channel only if it starts with foobar: # Save the offset in case we need to undo the read... set offset [tell $chan] if {[read $chan 6] eq "foobar"} { gets $chan line } else { set line {} # Undo the read... seek $chan $offset }SEE ALSOfile(3tcl), open(3tcl), close(3tcl), gets(3tcl), seek(3tcl), Tcl_StandardChannels(3tcl)KEYWORDSaccess position, channel, seeking Tcl 8.1 tell(3tcl)
Related Man Pages |
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tell(1t) - opensolaris |
seek(3tcl) - debian |
seek(n) - osx |
gets(3tcl) - debian |
tell(3) - linux |
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