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Full Discussion: Removing "^M" from the end of a String (i.e. "Ctrl+M")?
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
Old 07-25-2012
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
 

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LEARN ABOUT LINUX

service

service(8)						      System Manager's Manual							service(8)

NAME

       service - run a System V init script

SYNOPSIS

       service SCRIPT COMMAND [OPTIONS]

       service --status-all

       service --help | -h | --version

DESCRIPTION

       service runs a System V init script in as predictable environment as possible, removing most environment variables and with current working
       directory set to /.

       The SCRIPT parameter specifies a System V init script, located in /etc/init.d/SCRIPT.  The  supported  values  of  COMMAND  depend  on  the
       invoked	script,  service  passes  COMMAND and OPTIONS it to the init script unmodified.  All scripts should support at least the start and
       stop commands.  As a special case, if COMMAND is --full-restart, the script is run twice, first with the stop command, then with the  start
       command.

       service --status-all runs all init scripts, in alphabetical order, with the status command.

EXIT CODES

       service calls the init script and returns the status returned by it.

FILES

       /etc/init.d
	      The directory containing System V init scripts.

ENVIRONMENT

       LANG, TERM
	      The only environment variables passed to the init scripts.

SEE ALSO

       /etc/init.d/skeleton,
       update-rc.d(8),
       init(8),
       invoke-rc.d(8).

								     Jan 2006								service(8)
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