topic Re: Shell script - while do loop in Operating System - HP-UX

Shell script - while do loop

Chuck J — Thu, 26 Sep 2002 09:04:49 GMT

Hi

I want to use a while loop to read from a file. I would have a file called "notify", which would contain a list of users for who I want to email, there would be one email address per line. For example in the "notify" file I could have:

chuck@dom.com
dennis@dom.com

and so on

Then, for each person in the file I want to do awk out the username before the @ symbol:

while there are people in the file
echo "name, database is going down" | mail emailaddy
end

So, in effect for the first execution of the loop this would happen:
echo "chuck, database is going down" | mail chuck@dom.com

Regards
Chuck

Re: Shell script - while do loop

Robin Wakefield — Thu, 26 Sep 2002 09:27:35 GMT

Hi Chuck,

while read addr ; do
echo $addr | cut -d@ -f1 | read name
echo "$name, database is going down | mail $addr"
done < notify

Rgds, Robin

Re: Shell script - while do loop

Robin Wakefield — Thu, 26 Sep 2002 09:33:23 GMT

Duh,

move the quotes:

while read addr ; do
echo $addr | cut -d@ -f1 | read name
echo "$name, database is going down" | mail $addr
done < /tmp/names

Rgds, Robin

Re: Shell script - while do loop

Tom Maloy — Thu, 26 Sep 2002 11:36:07 GMT

OTOH, if you use ksh:

while read addr ; do
echo "${addr%@*}, database is going down" | mail $addr
done < /tmp/names

the ${} is a ksh construct. The %@* will remove the pattern that starts with @ from the variable.

Tom

Re: Shell script - while do loop

James R. Ferguson — Thu, 26 Sep 2002 11:43:46 GMT

Hi:

The built-in pattern substitution command offerd by Tom is available in the Posix shell too. See 'man -sh-posix'.

Regards!

...JRF...

Re: Shell script - while do loop

Leif Halvarsson_2 — Thu, 26 Sep 2002 12:01:27 GMT

IFS="@"
while read a b
do
echo "$a database is going down" |mail $a\@$b
done

Re: Shell script - while do loop

harry d brown jr — Thu, 26 Sep 2002 12:04:41 GMT

cat dbusernotifyfile | awk -F\@ '{name=$1; email=$0; printf("echo %s, database is go
ing down \| mailx -s \\\"database is going down\\\" %s\n", name, email);}' | xargs
-i sh {}

live free or die
harry

Re: Shell script - while do loop

Chuck J — Thu, 26 Sep 2002 12:42:29 GMT

James & Harry, your commands don't work!?

Re: Shell script - while do loop

Chuck J — Thu, 26 Sep 2002 12:44:19 GMT

Thanks everyone for your responses!!!

James & Harry, your commands don't work!?

Re: Shell script - while do loop

James R. Ferguson — Thu, 26 Sep 2002 12:48:53 GMT

Hi Chuck:

#!/usr/bin/sh
addr=jrferguson@xyz.com
echo ${addr#*@} #...yields xyz.com
echo ${addr%@*} #...yields jrferguson

Regards!

...JRF...

Re: Shell script - while do loop

harry d brown jr — Thu, 26 Sep 2002 12:57:09 GMT

If you CUT & PASTED then you might have eneded up with a CTRL-J in the middle of the line. I just cut and pasted and I had to remove the CTRL-J and it worked fine.

I included the subject line, because there is nothing more anoying than an email without a subject, which is why I used mailx.

what was the error message? Did you replace the file being cat'ed with the file of email addresses you are using?

live free or die
harry

Re: Shell script - while do loop

Sean OB_1 — Thu, 26 Sep 2002 13:34:28 GMT

How about this:

for ADDRESS in `cat /dir/notify`
do
USERNAME=` echo $ADDRESS| cut -d@ -f1 `
echo "$USERNAME, database is going down" | mail $ADDRESS
done

Re: Shell script - while do loop

Chuck J — Fri, 27 Sep 2002 07:01:32 GMT

G'Day Harry. Error is:

# ./awks
awk: The string echo %s, d cannot contain a newline character.
The source line is 1.
The error context is
{name=$1; email=$0; printf("echo %s, database is go >>>
<<<
syntax error The source line is 2.
awk: The statement cannot be correctly parsed.
The source line is 2.

./awks[4]: -i: not found.

Re: Shell script - while do loop

Chuck J — Fri, 27 Sep 2002 07:05:55 GMT

Harry, don't worry - I made the whole thing one line of code and it worked, but the email said this:

This message uses a character set that is not supported by the Internet Service. To view the original message content, open the attached message. If the text doesn't display correctly, save the attachment to disk, and then open it using a viewer that can display the original character set.

Then when you open the attachment it has the whole thing in there:

Received: from blah.com([19.150.203.126]) by blah.com with SMTP (Microsoft Exchange Internet Mail Service Version 5.5.2655.15)
id TTXP9425; Fri, 27 Sep 2002 04:08:06 -0400
Received: (from root@localhost) by blah.blah.com (8.7.1/8.7.1) id JAA07720 for me@blah.com; Fri, 27 Sep 2002 09:09:04 +0100 (BST)
Date: Fri, 27 Sep 2002 09:09:04 +0100 (BST)
From: root@blah.com
Message-Id: <200209270809.JAA07720@blah.com>
To: me@blah.com
Subject: database is going down
Mime-Version: 1.0
Content-Type: text/plain; charset=X-roman8
Content-Transfer-Encoding: 7bit

me, database is going down