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Full Discussion: Monitor a file and send mail
Top Forums Shell Programming and Scripting Monitor a file and send mail Post 303017046 by proactiveaditya on Tuesday 8th of May 2018 11:36:56 AM
Old 05-08-2018
Monitor a file and send mail

I want to monitor the maillog file in real time and send a mail when a certain grep condition is met. Every time the grep condition is met a mail will be sent. I wish to ignore all grep conditions 30 mins after each mail and thereafter continue monitoring.

For example:
  1. Condition is met, mail is sent
  2. 30 mins no mail even if condition is met.
  3. After 30 mins again condition is met and a mail is triggered.
  4. Again for next 30 mins no mail even if condition is met.

and so on.

I am doing the following:

Code:
tail -F -n0 /var/log/maillog | \
 grep -v --line-buffered 'status=sent' | \
 grep --line-buffered -v 'relay=local' | \
 grep --line-buffered 'relay=' | \
 while read line
 do
    echo "$line" | \
    mail -s Test mail@group.com
 done

Now i am not sure how to prevent mail sending 30 mins after the event is triggered.

Last edited by rbatte1; 05-10-2018 at 08:22 AM.. Reason: Formatted numbered list with LIST=1 tags and broke up one huge line to make it more readable.
 

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mail.local(1M)						  System Administration Commands					    mail.local(1M)

NAME
mail.local - store mail in a mailbox SYNOPSIS
/usr/lib/mail.local [-f sender] [-d] recipient DESCRIPTION
mail.local reads the standard input up to an end-of-file and appends it to each user's mail file (mailbox). This program is intended to be used by sendmail(1M) as a mail delivery agent for local mail. It is not a user interface agent. Messages are appended to the user's mail file in the /var/mail directory. The user must be a valid user name. Each delivered mail message in the mailbox is preceded by a "Unix From line" with the following format: From sender_address time_stamp The sender_address is extracted from the SMTP envelope address (the envelope address is specified with the -f option). A trailing blank line is also added to the end of each message. The mail files are locked with a .lock file while mail is appended. The mail files are created with mode 660, owner is set to recipient, and group is set to mail. If the ``biff'' service is returned by get- servbyname(3SOCKET), the biff server is notified of delivered mail. This program also computes the Content-Length: header which will be used by the mailbox reader to mark the message boundary. OPTIONS
The following options are supported: -f sender Specifies the "envelope from address" of the message. This flag is technically optional, but should be used. -d Specifies the recipient of the message. This flag is also optional and is supported here for backward compatibility. That is, mail.local recipient is the same as mail.local -d recipient. -l Turn on LMTP mode. -r from Specify the sender's name (for backward compatibility). -7 Do not advertise 8BITMIME support in LMTP mode. -b Return a permanent error instead of a temporary error if a mailbox exceeds quota. OPERANDS
The following operand is supported: recipient The recipient of the mail message. ENVIRONMENT VARIABLES
TZ Used to set the appropriate time zone on the timestamp. EXIT STATUS
The following exit values are returned: 0 Successful operation. >0 An error occurred. FILES
/tmp/local.XXXXXX temporary files /tmp/lochd.XXXXXX temporary files /var/mail/user_name user's mail file ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWsndmu | +-----------------------------+-----------------------------+ SEE ALSO
mail(1), comsat(1M), sendmail(1M), getservbyname(3SOCKET), attributes(5) SunOS 5.10 11 Apr 1997 mail.local(1M)
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