Removing "^M" from the end of a String (i.e. "Ctrl+M")? Post: 302677127

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Top Forums Shell Programming and Scripting Removing "^M" from the end of a String (i.e. "Ctrl+M")? Post 302677127 by mrm5102 on Wednesday 25th of July 2012 02:50:51 PM

07-25-2012

Registered User

Removing "^M" from the end of a String (i.e. "Ctrl+M")?

Hello All,

I have an Expect script that ssh's to a remote server and runs some commands before exiting.
One of the commands I run is the "hostname" Command. After I run this command I save the output
using this line in the code below...

Basically it executes the hostname command, then I loop through the "$expect_out(buffer)" variable
line by line. The "$expect_out(buffer)" variable holds the output of the last "send" command, up to
the next "expected" ouput.

Code:

....
send -- "hostname\r"
expect {
    -re "^hostname.*\r.*" {
        set found 0
        foreach line [split $expect_out(buffer) "\n"] {
            if {$found == 1} {
                set host_name "$line"
                break
            }
            if {[regexp ".*hostname.*" $line]} {
                set found 1
                continue
            }
        }
        puts -nonewline "host_name = \"$host_name\"\n"
    timeout { exit 1 }
    default { exit 11 }
}

The reason I know that it's showing a "^M" at the end of that variable, is because I redirected the output
to a file on one of my tries, and while viewing the output in vi I was able to see the special characters.

And this is the output from the "puts" command. It shows like this below (notice the quotation mark is begin
moved to the start of that line.)...

Code:

"ost_name = "My-VM-Host

As you can see the last quotation mark is replacing the first character on the same line...

Any thoughts how I could get rid of this "^M" from my variable..? It would be VERY much appreciated!

Thanks in Advance,
Matt

mrm5102

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puts

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

__________________________________________________________________________________________________________________________________________________

NAME

       puts - Write to a channel

SYNOPSIS

       puts ?-nonewline? ?channelId? string
_________________________________________________________________

DESCRIPTION

       Writes  the  characters	given by string to the channel given by channelId.  ChannelId must be a channel identifier such as returned from a
       previous invocation of open or socket. It must have been opened for output. If no channelId is specified then it defaults to  stdout.  Puts
       normally outputs a newline character after string, but this feature may be suppressed by specifying the -nonewline switch.

       Newline	characters  in	the output are translated by puts to platform-specific end-of-line sequences according to the current value of the
       -translation option for the channel (for example, on PCs newlines are normally replaced with carriage-return-linefeed sequences;  on Macin-
       toshes newlines are normally replaced with carriage-returns).  See the fconfigure manual entry for a discussion on ways in which fconfigure
       will alter output.

       Tcl buffers output internally, so characters written with puts may not appear immediately on the output file or device;	Tcl will  normally
       delay output until the buffer is full or the channel is closed.	You can force output to appear immediately with the flush command.

       When the output buffer fills up, the puts command will normally block until all the buffered data has been accepted for output by the oper-
       ating system.  If channelId is in nonblocking mode then the puts command will not block even if the  operating  system  cannot  accept  the
       data.   Instead,  Tcl  continues to buffer the data and writes it in the background as fast as the underlying file or device can accept it.
       The application must use the Tcl event loop for nonblocking output to work;  otherwise Tcl never finds out that the file or device is ready
       for more output data.  It is possible for an arbitrarily large amount of data to be buffered for a channel in nonblocking mode, which could
       consume a large amount of memory.  To avoid wasting memory, nonblocking I/O should normally be used in an  event-driven	fashion  with  the
       fileevent  command  (don't  invoke  puts  unless you have recently been notified via a file event that the channel is ready for more output
       data).

SEE ALSO

       file(n), fileevent(n)

KEYWORDS

       channel, newline, output, write

Tcl									7.5								   puts(n)