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Full Discussion: awk help in calulating difference for last two lines
Top Forums UNIX for Dummies Questions & Answers awk help in calulating difference for last two lines Post 302320045 by rubin on Wednesday 27th of May 2009 01:12:34 AM
Old 05-27-2009
Quote:
Originally Posted by senthilkumar_ak
Hi all,
...
but i need to find out the differnce between the last line $1 value and the second last line value $1
Assuming the lines of interest are of the same format ( as posted ) and they're always present in the last 40 records of the log file, you can do something like this:

Code:
tail -40 logfile | awk -F'[(/)]' '/: freed/{ y=x; x=$4 }END{ print (x-y)/(1024*1024) " MB"}'


Quote:
...if this value is more than 50 MB then i need to send mail. Could you please some one help on this.
Something along the lines of ...

Code:
[ $(tail -40 logfile | awk -F'[(/)]' '/: freed/{ y=x; x=$4 }END{ print int((x-y)/(1024*1024)) }') -gt 50 ] && \
                                       mail -s "Attention" user@mail.com || echo OK

#the test expects integers only, ( bash )!

or calling the mail command with the system function in the END statement:

Code:
tail ... | awk '{...} END{ if((d=(x-y)/(1024*1024))>n) system("mail -s "Attention" user@mail.com"); else print d " MB" }' n=50

Modify it to your needs.
 

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LEARN ABOUT OSF1

from

from(1) 						      General Commands Manual							   from(1)

NAME

       from - Shows whom mail messages are from

SYNOPSIS

       from [-s sender] [user]

       The from command prints out the mail header lines in your mailbox file.

OPTIONS

       Prints headers for mail sent by sender.	Specifies a mail spool directory.

	      Use this flag if you want to examine a mailbox in a directory other than /usr/spool/mail, which is the system default.

DESCRIPTION

       If user is specified, then user's mailbox is examined instead of your own.

EXAMPLES

       To display the message headings in your mailbox, enter: from

	      The  names  of  the  senders and the message dates are displayed.  To display the message headings for mail sent by a specific user,
	      enter: from -s dale

	      Displays only the message headings of the messages sent from user dale.  To display the message headings in a specific user's  mail-
	      box, enter: from dawn

	      The message headings from user dawn's mailbox are displayed, provided you have read permission for dawn's mailbox.

FILES

       User mailbox files.

SEE ALSO

       Commands:  biff(1), mail(1), mailx(1)

																	   from(1)
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