Need help in with creating a script.

xtremeclones · 09-11-2007, 10:09 AM

Hello all.

I need some help with a script and im not yet too good with bash.

i need a script which would execute hourly on the Cron Job.

the command would be: asterisk -rx 'show channels'

which would then give an output of:

2 active channels
1 active call

i need the script to grep the x amount of calls and when there are 200 or more calls to send me an email saying 'you've got 200 or more call in system x.x.x.x.

Can anyone help me creating this script.

thanks in advanced!!!

angel115 · 09-11-2007, 01:02 PM

Hello xtremeclones,

For your script you can try the following:

Code:

#/bin/bash

# the following line will grep the number of "active call"
ActiveCall=$( asterik -rx 'show channels' | tail -1 | sed -e 's/[a-z]//g' )

# "-ge" meen greater or equal. Use "-gt" for strictly greater or type "man test" for more details
If [ ${ActiveCall} -ge 200 ]; then

   *******************
   send your email here (I didn't have time to check how to do it)
   *******************

  done
 else
   *******************
   do some thing else
   *******************
fi

I didn't try it but it should work. I didn't have time to check how to send notification email.

Maybe some one else could help for that part

PS: Let me know if that doesn't work.

Best regards,
Angel.

colucix · 09-11-2007, 01:24 PM

Quote:

Originally Posted by xtremeclones

I need some help with a script and im not yet too good with bash.
Can anyone help me creating this script.

You can at least show what you've tried so far! All of us were bad at the very first attempts in shell programming!

Anyway, for the notification part you can use sendmail, doing some tests to be sure there are no limitations from the mail server. In a script you can put something like:

Code:

/usr/sbin/sendmail -f "sender@domain.it" "recipient@domain.it" << EOM
From: Me <sender@domain.it>
To: Me Too <recipient@domain.it>
Subject: number of calls

(date "+%A %e %b %Y %T")
The number of active calls exceed 200. Actual number is $ActiveCall

EOM

The construct

Code:

<< EOM
EOM

is a so-called "here document", look at man bash for details or a bash programming guide. The important thing is that the ending delimiter (EOM in this case) must be at the beginning of the line, otherwise it is unnoticed. In the here document, that is in the body of the mail you can put command substitutions, shell variables and so on: they all will be expanded/executed, so you will have a flexible and useful notification tool!

xtremeclones · 09-12-2007, 09:53 AM

Thank you so much guys, i will give it a try today and post the results.

again thanks for the help!!

xtremeclones · 09-12-2007, 01:57 PM

ok this is what i have:

#/bin/bash

# the following line will grep the number of "active call"
ActiveCall=$( asterisk -rx 'show channels' | tail -1 | sed -e 's/[a-z]//g' )

# "-ge" meen greater or equal. Use "-gt" for strictly greater or type "man test" for more details
If [ ${ActiveCall} -ge 200 ];Then
/usr/sbin/sendmail -f "xtremeclones@hotmail.com" "xtremeclones@hotmail.com" << EOM
From: Me <xtremeclones@hotmail.com>
Subject: number of calls

(date "+%A %e %b %Y %T")
The number of active calls exceed 200. Actual number is $ActiveCall

EOM
done
fi

It gives me the following:
[root@1]# ./channels.sh
./channels.sh: line 7: If: command not found
./channels.sh: line 7: Then: command not found
./channels.sh: line 16: syntax error near unexpected token `done'
./channels.sh: line 16: ` done'

I do however get an email saying:

(date "+%A %e %b %Y %T")
The number of active calls exceed 200. Actual number is V 13

this is all it says in the Body.

What am i doing wrong??

thanks for the help

colucix · 09-13-2007, 02:24 AM

Code:

[root@1]# ./channels.sh
./channels.sh: line 7: If: command not found
./channels.sh: line 7: Then: command not found
./channels.sh: line 16: syntax error near unexpected token `done'
./channels.sh: line 16: `  done'

I did not check the syntax of code from previous posts, but here the errors are pretty clear. The correct syntax of an if/then control statement is

Code:

if <condition>
then
   <commands>
fi

that is lower case. The "done" statement is out of place, or better it is not required at all, since it terminates a "for... do" or a "while... do" loop.

Quote:

I do however get an email saying:

(date "+%A %e %b %Y %T")
The number of active calls exceed 200. Actual number is V 13

I expected that the date command would have been executed. You can try the following syntax with back quotes

Code:

`date "+%A %e %b %Y %T"`

this works for me. For any other doubt about syntax I'd suggest to keep at hand a good bash programming guide (some of them are available at www.tldp.org) or simply check

Code:

man bash

the rest is a matter of experience. Anyway, feel free to ask!

angel115 · 09-13-2007, 05:43 AM

So here is a script which should work

Code:

#/bin/bash
# Grab the Date and time here and put it in the variable "mytime"
mytime=$( date "+%A %e %b %Y %T" )

# the following line will grep the number of "active call"
ActiveCall=$( asterisk -rx 'show channels' | tail -1 | sed -e 's/[a-z]//g' )

# "-ge" meen greater or equal. Use "-gt" for strictly greater or type "man test" for more details
if [ ${ActiveCall} -ge 200 ];then
/usr/sbin/sendmail -f "xtremeclones@hotmail.com" "xtremeclones@hotmail.com" << EOM
From: Me <xtremeclones@hotmail.com>
Subject: number of calls

${mytime}
The number of active calls exceed 200. Actual number is ${ActiveCall}

EOM
fi

xtremeclones · 09-13-2007, 11:20 PM

Thank you for all the responses.

This is what i have:

#/bin/bash
# Grab the Date and time here and put it in the variable "mytime"
mytime=$( date "+%A %e %b %Y %T" )

# the following line will grep the number of "active call"
ActiveCall=$( asterisk -rx 'show channels' | tail -1 | sed -e 's/[a-z]//g' )

# "-ge" meen greater or equal. Use "-gt" for strictly greater or type "man test" for more details
if [ ${ActiveCall} -ge 200 ];then
/usr/sbin/sendmail -f "xtremeclones@hotmail.com" "xtremeclones@hotmail.com" << EOM
From: Me <xtremeclones@hotmail.com>
Subject: number of calls

${mytime}
The number of active calls exceed 200. Actual number is ${ActiveCall}

EOM
fi

I get this error:

./channels.sh: line 9: [: too many arguments

has anyone else tries this on their system?

thanks!!!

xtremeclones · 09-17-2007, 03:39 PM

Bump! Anyone??

colucix · 09-17-2007, 04:24 PM

The error message is quite clear

Code:

./channels.sh: line 9: [: too many arguments

too many arguments in expression

Code:

if [ ${ActiveCall} -ge 200 ];then

I never used asterisk (nor I know what it is) so I cannot assist you for this part, but what is the output from

Code:

asterisk -rx 'show channels' | tail -1 | sed -e 's/[a-z]//g'

? I suspect it is not a single number, but a string with two or more fields. First you can try to echo the value of $ActiveCall before the if/then statement, second you can try to launch the script by means of

Code:

bash -x channels.sh

this will show the execution flow of the entire script and help in debugging.

angel115 · 10-01-2007, 05:34 AM

Hello xtremeclones,

You probably have some space at the end which might create some issues.
Can you try that and tell me what does it give you?

Code:

asterisk -rx 'show channels' | tail -1 | sed -e 's/[a-z]//g' | sed -e 's/\ *$//g'

Regards,
Angel.