gets(n)                      Tcl Built-In Commands                     gets(n)


       gets - Read a line from a channel

       gets channelId ?varName?

       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).  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 nonblocking 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
       nonblocking 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.

       eof(n), fblocked(n)

       blocking, channel, end of file, end of line, line, nonblocking, read

Tcl                                   7.5                              gets(n)