[SOLVED] need working scripts

mahan77 · 04-27-2013, 05:41 AM

Hello every one
How do I rewrite this file (fail2ban.sh) so I can get it work?
I need this to send a mail from log file

#!/bin/bash
grep - $(date +"%Y-%m-%d" --date="1 days ago") /var/log/fail2ban.log << EOF | /usr/sbin/sendmail -t
to:mail@somedomian.com
from:webServer
subject:Fail2Ban-LOG

EOF

Sigg3.net · 04-27-2013, 07:23 AM

In my experience, the CAT << redirection does not work in bash scripts (as it does in "interactive" mode). Here's an alternative:

Code:

#!/bin/bash
# create tmp file mail
mail=`mktemp mail.XXXXXX`

# add meta info
echo "to:mail@somedomain.com" >> $mail
echo "from:webServer" >> $mail
echo "subject:Fail2Ban-LOG" >> $mail

# msg body
grep - $(date +"%Y-%m-%d" --date="1 days ago") /var/log/fail2ban.log >> $mail

# send it!
cat $mail | /usr/sbin/sendmail -i -t

rm -f $mail
exit

The correct way to replace the "CAT trick" is probably to do a while-loop, but I'm not wearing my brain today:P

mahan77 · 04-27-2013, 07:38 AM

Quote:

Originally Posted by Sigg3.net

In my experience, the CAT << redirection does not work in bash scripts (as it does in "interactive" mode). Here's an alternative:

Code:

#!/bin/bash
# create tmp file mail
mail=`mktemp mail.XXXXXX`

# add meta info
echo "to:mail@somedomain.com" >> $mail
echo "from:webServer" >> $mail
echo "subject:Fail2Ban-LOG" >> $mail

# msg body
grep - $(date +"%Y-%m-%d" --date="1 days ago") /var/log/fail2ban.log >> $mail


# send it!
cat $mail | /usr/sbin/sendmail -i -t

rm -f $mail

The correct way to replace the "CAT trick" is probably to do a while-loop, but I'm not wearing my brain today:P

I will try this and update about it
Thanks

The scripts do what I want to do.
Thank you again

unSpawn · 04-27-2013, 07:49 AM

...or provided mailx is installed:

Code:

#!/bin/sh --
grep - $(date +"%Y-%m-%d" --date="1 days ago") /var/log/fail2ban.log | mail -s "Fail2Ban-LOG" recipient@some.dom.ain
exit 0

...or provided Logwatch is installed:

Code:

#!/bin/sh --
logwatch --detail High --range Yesterday --service fail2ban --mailto recipient@some.dom.ain
exit 0

*BTW fail2ban emails violations by default. Why email more?..

Sigg3.net · 04-27-2013, 08:07 AM

Btw, you would probably want to add 'exit' at the last line of the .sh file

mahan77 · 04-27-2013, 09:03 AM

Thanks for the tips.
I’m new to linux, learning as I go along

David the H. · 04-29-2013, 11:22 AM

Quote:

Originally Posted by Sigg3.net

In my experience, the CAT << redirection does not work in bash scripts (as it does in "interactive" mode).

Huh? That's not a "trick", it's just a standard here document, and will work with any command that can accept text from stdin.

The only problem I see here is that the OP is trying to send the input into grep, which is already reading data from a file and so will ignore it. This just means that the output has to be reconfigured to be sent into mail correctly.

This could be done with a command substitution inside the heredoc, among other techniques. No need for any external files.

Code:

#!/bin/bash

cat << EOF  | /usr/sbin/sendmail -t
to:mail@somedomian.com
from:webServer
subject:Fail2Ban-LOG
$( grep - $(date +"%Y-%m-%d" --date="1 days ago") /var/log/fail2ban.log )
EOF

And in fact, I don't see the need for a heredoc either. A simple command grouping can do the trick just as well.

Code:

#!/bin/bash

{
echo 'to:mail@somedomian.com'
echo 'from:webServer'
echo 'subject:Fail2Ban-LOG'
grep - $(date +"%Y-%m-%d" --date="1 days ago") /var/log/fail2ban.log
} | /usr/sbin/sendmail -t

PS: See my reply in the OP's previous thread about grepping the logfile.

Sigg3.net · 04-29-2013, 11:52 AM

Nice script there, David!

I only recently learned that it's called a "heredoc", and I still think it's a neat "trick" for those of us still learning bash basics