Simple script to test mountGpoint for read-write Post: 302992015

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Top Forums Shell Programming and Scripting Simple script to test mountGpoint for read-write Post 302992015 by jaapar on Monday 20th of February 2017 03:20:05 PM

02-20-2017

Registered User

Quote:

Originally Posted by drysdalk

Hi,

A script like this set up on ServerA should do the trick.

Code:

#!/bin/bash
date=`/bin/date +%Y%m%d%H%M%S`

email_to="unixforum@localhost"
email_subject="Something went wrong"
email_body="Uh-oh"

server="localhost"

if ! /usr/bin/ssh "$server" "/usr/bin/touch /mnt/testfile.$date" >/dev/null 2>/dev/null
then
        echo "$email_body" | /usr/bin/mail -s "$email_subject" "$email_to"
        exit 1
fi

exit 0

The 'date' variable at the top just creates a string via the 'date' command that consists of the year, month, date, hour, minute and second all run together. I went with this since you didn't specify any particular format, but this should do for most purposes (if the script only runs at most once per second, anyway).

The next three variables define the recipient, subject and body of the e-mail message. You can customise those all you like.

Finally, the variable 'server' defines the remote server that the 'ssh' command will use to connect to. You'll want to change this to the details of whatever ServerB is.

The basic idea of the script is that it connects to the remote server, and if the 'touch' command (or the 'ssh' command itself) returns a non-successful exit value for any reaason, it then proceeds to send the e-mail.

Here's an example session of it running, in a situation where the touch command at the remote end (which is really just 'localhost' in my test case) fails.

Code:

$ whoami
unixforum
$ ./script.sh 
$ mail
"/var/mail/unixforum": 1 message 1 new
>N   1 unixforum@localhost Mon Feb 20 15:17  15/654   Something went wrong
? 1
<e-mail headers appear here, redacted>

Uh-oh
? d 1
? q
Held 0 messages in /var/mail/unixforum
$

Hope this helps.

Yes thank you!!! script worked like a charm!!

jaapar

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LEARN ABOUT MINIX

mail

MAIL(1) 						      General Commands Manual							   MAIL(1)

NAME

       mail - send and receive electronic mail

SYNOPSIS

       mail [-dpqrv] [-f file] [user]

OPTIONS

       -d     Force use of the shell variable MAILER

       -f     Use file instead of /usr/spool/mail/user as mailbox

       -p     Print all mail and then exit

       -q     Quit program if SIGINT received

       -r     Reverse print order, i.e., print oldest first

       -v     Verbose mode

EXAMPLES

       mail ast 	   # Send a message to ast

       mail		   # Read your mail

DESCRIPTION

       Mail  is  an  extremely simple electronic mail program.	It can be used to send or receive email on a single MINIX system, in which case it
       functions as user agent and local delivery agent.  If the flag MAILER is defined in mail.c, it can also call a transport  agent	to  handle
       remote mail as well.  No such agent is supplied with MINIX.

       When  called  by  user  with no arguments, it examines the mailbox /usr/spool/mail/user, prints one message (depending on the -r flag), and
       waits for one of the following commands:

	 <newline> Go to the next message
	 -	   Print the previous message
	 !command  Fork off a shell and execute command
	 CTRL-D    Update the mailbox and quit (same as q)
	 d	   Delete the current message and go to the next one
	 q	   Update the mailbox and quit (same as CTRL-D)
	 p	   Print the current message again
	 s [file]  Save message in the named file
	 x	   Exit without updating the mailbox

       To send mail, the program is called with the name of the recipient as an
       argument.  The mail is sent, along with a postmark line containing the date.
       For local delivery, a file named after the recipient in the directory
       /usr/spool/mail must be writable.

       If the directory /usr/spool/mail does not exist then the mail is
       dumped on the console, so that system programs have a way to notify
       a user on a system that does not have a mail spool.

																	   MAIL(1)