Still celebrating National IT Professionals Day with 3 months of free Premium Membership. Use Code ITDAY17

x
?
Solved

alarm sound when something is put in a file

Posted on 2002-05-08
7
Medium Priority
?
407 Views
Last Modified: 2010-04-21
Let us say I have a process that is running and appending some text at the end of a file so using the following command

tail -f myFile | grep alarmText        ----(1)

I will get a line of output whenever the alaramText is put on the file.

What I want is some kind of alarming sound (such as the one you get when someone initiates a "talk command" with your name), so that I will be able to know when that thing happend instead of shifting my attention and going at the xterm I am running (1).
0
Comment
Question by:oumer
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 3
7 Comments
 
LVL 51

Expert Comment

by:ahoffmann
ID: 6997344
tail myFile |(grep alarmText && /bin/echo "\007")
0
 
LVL 4

Author Comment

by:oumer
ID: 6999659
first of all thanks for letting me know to use /bin/echo cause I was using just echo ,which was in /usr/bin and it doesn't work with the bell sound. but still there is some problem with the code you sent. I still get a text message but no sound. but when i tried /bin/echo "\007" the alarm sounds ok.

I wrote a small script called alarm.sh

x=0
while [ "$x" -ne 100 ]
do
/bin/echo "\007"
let x=x+1
done

which will just sound the bell 100 times and it works alone perfectly

then  I used

tail -f myFile |(grep alarmText && alarm.sh)

the output i get is the same as

tail -f myFile | grep alarmText

(I am using -f since I want to create endless check)

so I think the && ing is not working. What do you think is the problem?










0
 
LVL 4

Author Comment

by:oumer
ID: 6999665
but doing something like
echo "hi" && echo "bye" works (I mean as a standalone command without the piping and everything)
0
What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

 
LVL 51

Expert Comment

by:ahoffmann
ID: 6999705
oops, the grep command never exits (as long as the pipe is open), so the following command does not exectute, that's the reason.

The simplest solution would be to modify your alarm.sh in that way that it gets the input, does a grep and bells. Then call it like:

   tail -f myFile |alarm.sh
0
 
LVL 84

Expert Comment

by:ozo
ID: 7000375
tail -f myFile | perl -pe 's/(alarmText)/\a$1\a/'
0
 
LVL 4

Author Comment

by:oumer
ID: 7001194
ahofmann,
i still don't get it how to return from the grep even in the alarm file, cause it seems it is constantly getting input and never returning (because of the tail piping)

and ozo,
I tried your code it doesn't work
0
 
LVL 51

Accepted Solution

by:
ahoffmann earned 150 total points
ID: 7001217
#! /bin/ksh
# alarm.sh
while read line; do
    \echo "$line"|grep alarmText && /bin/echo "\007"
done
exit

then use
   tail -f myFile |alarm.sh

works for me.
0

Featured Post

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Let's say you need to move the data of a file system from one partition to another. This generally involves dismounting the file system, backing it up to tapes, and restoring it to a new partition. You may also copy the file system from one place to…
I promised to write further about my project, and here I am.  First, I needed to setup the Primary Server.  You can read how in this article: Setup FreeBSD Server with full HDD encryption (http://www.experts-exchange.com/OS/Unix/BSD/FreeBSD/A_3660-S…
Learn how to get help with Linux/Unix bash shell commands. Use help to read help documents for built in bash shell commands.: Use man to interface with the online reference manuals for shell commands.: Use man to search man pages for unknown command…
Learn how to find files with the shell using the find and locate commands. Use locate to find a needle in a haystack.: With locate, check if the file still exists.: Use find to get the actual location of the file.:
Suggested Courses

670 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question