NAME

       gets - Read a line from a channel

SYNOPSIS

       gets channelId ?varName?
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DESCRIPTION

       This command reads the next line from channelId, returns everything in the line up to (but not including)
       the end-of-line character(s), and discards the end-of-line character(s).

       ChannelId  must  be an identifier for an open channel such as the Tcl standard input channel (stdin), the
       return value from an invocation of open or socket, or the result of a channel creation  command  provided
       by a Tcl extension. The channel must have been opened for input.

       If  varName  is  omitted the line is returned as the result of the command.  If varName is specified then
       the line is placed in the variable by that name and the  return  value  is  a  count  of  the  number  of
       characters returned.

       If  end of file occurs while scanning for an end of line, the command returns whatever input is available
       up to the end of file.  If channelId is in non-blocking mode and there  is  not  a  full  line  of  input
       available,  the  command returns an empty string and does not consume any input.  If varName is specified
       and an empty string is returned in varName because of end-of-file or because of insufficient data in non-
       blocking mode, then the return count is -1.  Note that if varName is not specified then  the  end-of-file
       and  no-full-line-available  cases can produce the same results as if there were an input line consisting
       only of the end-of-line character(s).  The eof and fblocked commands can be  used  to  distinguish  these
       three cases.

EXAMPLE

       This  example  reads a file one line at a time and prints it out with the current line number attached to
       the start of each line.

              set chan [open "some.file.txt"]
              set lineNumber 0
              while {[gets $chan line] >= 0} {
                  puts "[incr lineNumber]: $line"
              }
              close $chan

SEE ALSO

       file(3tcl), eof(3tcl), fblocked(3tcl), Tcl_StandardChannels(3tcl)

KEYWORDS

       blocking, channel, end of file, end of line, line, non-blocking, read

Tcl                                                    7.5                                            gets(3tcl)