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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LEARN ABOUT MINIX

break

break(1)                                                           User Commands                                                          break(1)

NAME

       break, continue - shell built-in functions to escape from or advance within a controlling while, for, foreach, or until  loop

SYNOPSIS

   sh
       break [n]

       continue [n]

   csh
       break

       continue

   ksh
       *break [n]

       *continue [n]

DESCRIPTION

   sh
       The break utility exits from the enclosing for or while loop, if any. If n is specified, break n levels.

       The continue utility resumes the next iteration of the enclosing for or while loop. If n is specified, resume at the n-th enclosing loop.

   csh
       The  break  utility  resumes  execution after the end of the nearest enclosing foreach or while loop. The remaining commands on the current
       line are executed. This allows multilevel breaks to be written as a list of break commands, all on one line.

       The continue utility continues execution of the next iteration of the nearest enclosing while or foreach loop.

   ksh
       The break utility exits from the enclosed for, while, until, or select loop, if any. If n is specified,  then  break  n  levels.  If  n  is
       greater than the number of enclosing loops, the outermost enclosing loop shall be exited.

       The  continue utility resumes the next iteration of the enclosed for, while, until, or select loop. If n is specified then resume at the n-
       th enclosed loop. If n is greater than the number of enclosing loops, the outermost enclosing loop shall be used.

       On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways:

       1.  Variable assignment lists preceding the command remain in effect when the command completes.

       2.  I/O redirections are processed after variable assignments.

       3.  Errors cause a script that contains them to abort.

       4.  Words that follow a command preceded by ** that are in the format of a variable assignment are expanded with the same rules as a  vari-
           able  assignment.  This means that tilde substitution is performed after the = sign, and also that word splitting and file name genera-
           tion are not performed.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWcsu                      |
       +-----------------------------+-----------------------------+

SEE ALSO

       csh(1), exit(1), ksh(1), sh( 1), attributes(5)

SunOS 5.10                                                          17 Jul 2002                                                           break(1)