CentOS - Nov 2018 - CentOS 7 bash perhaps off topic

hi all,

I have a small script that seems to be exiting and hitting the sleep 60...
The smwebsocket just connects to the web socket provided and outputs the
data. This works manually.

the myprogram just opens a database and writes the line...

My desire is to run the smwebsocket, connect to the websocket and output
the data (line by line) when we get a line that matches Location take that
line and output to the database. Seems simple. I desire this to keep the
connection alive and just continue to read data and grep on the data etc...
if smwebsocket does exit, sleep 60 and reconnect.

However it seems to be exiting and running the sleep 60. Am I missing
something ?

while [ 1 ]
                do
                        smwebsocket "$URL" | grep Location | while
read line
                        do
                                myprogram -data "$line"
                        done

                sleep 60
                Reconnecting...
                done

All the pieces work - just not the actual running.  What am I missing?

Jerry

So you are saying that the actual "while read line do ?.. done ?." is
what is failing?Try sending the output of the?smwebsocket "$URL" |
grep Location so we may see what is being passed to the while read line.
Additionally you could use sh -x to execute it and it may show something.
You could send the code exactly also.K
    On ?Monday?, ?November? ?26?, ?2018? ?03?:?11?:?14? ?PM? ?EST, Jerry Geis
<jerry.geis at gmail.com> wrote:
 
 hi all,

I have a small script that seems to be exiting and hitting the sleep 60...
The smwebsocket just connects to the web socket provided and outputs the
data. This works manually.

the myprogram just opens a database and writes the line...

My desire is to run the smwebsocket, connect to the websocket and output
the data (line by line) when we get a line that matches Location take that
line and output to the database. Seems simple. I desire this to keep the
connection alive and just continue to read data and grep on the data etc...
if smwebsocket does exit, sleep 60 and reconnect.

However it seems to be exiting and running the sleep 60. Am I missing
something ?

while [ 1 ]
? ? ? ? ? ? ? ? do
? ? ? ? ? ? ? ? ? ? ? ? smwebsocket "$URL" | grep Location | while
read line
? ? ? ? ? ? ? ? ? ? ? ? do
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? myprogram -data "$line"
? ? ? ? ? ? ? ? ? ? ? ? done

? ? ? ? ? ? ? ? sleep 60
? ? ? ? ? ? ? ? Reconnecting...
? ? ? ? ? ? ? ? done

All the pieces work - just not the actual running.? What am I missing?

Jerry
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If I'm understanding you corectly, you want smwebsocket to continuously pull
data passing it to grep for filtering and ultimately to myprogram to update a
database.  If that's correct I haven't had an opportunity to work with
that but my current understanding of how pipelining works is that smwebsocket
would retrieve $URL (which would be a finite amount of data), it would end
sending output to grep which would filter it (and end) sending its output to the
while loop around myprogram which would process it until there was no more data
(and end) thus landing at 'sleep 60' only to start over again.  If a
pipeline is capable of continuous processing I'm not aware of it (but would
be glad to know that's how it can work).


Leroy Tennison
Network Information/Cyber Security Specialist
E: leroy at datavoiceint.com
2220 Bush Dr
McKinney, Texas
75070
www.datavoiceint.com
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________________________________________
From: CentOS <centos-bounces at centos.org> on behalf of Jerry Geis
<jerry.geis at gmail.com>
Sent: Monday, November 26, 2018 2:11 PM
To: CentOS mailing list
Subject: [EXTERNAL] [CentOS] CentOS 7 bash perhaps off topic

hi all,

I have a small script that seems to be exiting and hitting the sleep 60...
The smwebsocket just connects to the web socket provided and outputs the
data. This works manually.

the myprogram just opens a database and writes the line...

My desire is to run the smwebsocket, connect to the websocket and output
the data (line by line) when we get a line that matches Location take that
line and output to the database. Seems simple. I desire this to keep the
connection alive and just continue to read data and grep on the data etc...
if smwebsocket does exit, sleep 60 and reconnect.

However it seems to be exiting and running the sleep 60. Am I missing
something ?

while [ 1 ]
                do
                        smwebsocket "$URL" | grep Location | while
read line
                        do
                                myprogram -data "$line"
                        done

                sleep 60
                Reconnecting...
                done

All the pieces work - just not the actual running.  What am I missing?

Jerry
_______________________________________________
CentOS mailing list
CentOS at centos.org
https://lists.centos.org/mailman/listinfo/centos

Thanks... I have enhanced the function of smwebsocket to do the parts of
the script that I thought the pipeline was doing...

Jerry