gets(newpasswd) - phpMan

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



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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 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 con-
       sisting  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  num-
       ber 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(n), eof(n), fblocked(n), Tcl_StandardChannels(3)


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



Tcl                                            7.5                                        gets(n)

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