topic Re: unix script in Operating System - HP-UX

unix script

so.nimda — Wed, 04 Jun 2008 07:48:41 GMT

Hi,

I need some help with a unix script. Basically, I would like the script to email to me a log that it generated. The line that generates the script is :

exec > /test/`basename $0`_`date +%d-%b-%H:%M`.log 2>&1

Is is correct for me to issue the next line in the script as :

mailx -s "Log file" myname@mymail.com <&1

Not sure if this makes sense as I'm a newbie at writing scripts.

Thanks in advance.

Re: unix script

Laurent Menase — Wed, 04 Jun 2008 09:50:02 GMT

no, you redirect output to a file

LOGFILE="test/`basename $0`_`date +%d-%b-%H:%M`.log"

exec 3>&1 4>&2 >$LOGFILE 2>&1

mailx -s "...." <$LOGFILE
exec 1>&3 2>&4 # to get back the previous output.

Re: unix script

marvik — Wed, 04 Jun 2008 10:38:00 GMT

take a look @ man uuencode to attach a fileto your mail.there is some example as well to help you out

Cheers

Re: unix script

OFC_EDM — Wed, 04 Jun 2008 11:57:23 GMT

uuencode | mailx -m -s "subject" email@domain.name

The -m is required when attaching a file using mailx on HP-UX.

Example

uuencode /tmp/mylog.log mylog.doc | mailx -m -s "my important log" someone@important.ca

This will send the mylog.log but rename it as mylog.doc. Handy when you receive the email. When you double click the attachment it will open in Word or whichever app is setup to open .doc files.

Re: unix script

so.nimda — Thu, 05 Jun 2008 00:19:57 GMT

Hi Laurent Menase,

Thanks for your reply.

Would you be able to explain the lines :

"exec 3>&1 4>&2 >$LOGFILE 2>&1" & "exec 1>&3 2>&4"

I know that 0 is stdin, 1 is stdout, 2 is stderr but what's 3 & 4? I'm really not good at this - apologies.

Regards

Re: unix script

so.nimda — Thu, 05 Jun 2008 00:23:06 GMT

Hi marvik & Kevin_Urschatz,

Thanks for your replies.

That's a very elegant way of doing it !

Regards

Re: unix script

Dennis Handly — Thu, 05 Jun 2008 01:51:25 GMT

>Would you be able to explain the lines:
"exec 3>&1 4>&2 >$LOGFILE 2>&1" & "exec 1>&3 2>&4"

This is shell trickery.
Basically it dups file 1 to file 3 and file 2 to file 4 (saves them).
Then the second one puts those files back.

Re: unix script

Laurent Menase — Thu, 05 Jun 2008 04:10:31 GMT

Yes it is exactly that

exec 3>&1 4>&2 >afile.log 2>anotherfile.log
save fildescriptor 1 to 3 and 2 to 4
before redirecting them to files

and after to put back the filedesc in place
better way
exec 1>&3 2>&4 3<&- 4<&-
3<&- 4<&- close the dupped fildescripor after recovering the initial outputs

Re: unix script

so.nimda — Thu, 05 Jun 2008 05:44:53 GMT

Hi Dennis & Laurent,

Thanks so much for the help and explanation.

Laurent : I've tried your script and it worked beautifully. Thanks once again !