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).

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________________________________________ From: CentOS centos-bounces@centos.org on behalf of Jerry Geis jerry.geis@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@centos.org https://lists.centos.org/mailman/listinfo/centos