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
2 thoughts on - CentOS 7 Bash Perhaps Off Topic
So you are saying that the actual “while read line do ….. done ….” is what is failing?Try sending the output of the smwebsocket “$URL” | grep Location so we may see what is being passed to the while read line. Additionally you could use sh -x to execute it and it may show something. You could send the code exactly also.K wrote:
On Monday, November 26, 2018 03:11:14 PM EST, Jerry Geis
hi all,
I have a small script that seems to be exiting and hitting the sleep 60… The smwebsocket just connects to the web socket provided and outputs the data. This works manually.
the myprogram just opens a database and writes the line…
My desire is to run the smwebsocket, connect to the websocket and output the data (line by line) when we get a line that matches Location take that line and output to the database. Seems simple. I desire this to keep the connection alive and just continue to read data and grep on the data etc… if smwebsocket does exit, sleep 60 and reconnect.
However it seems to be exiting and running the sleep 60. Am I missing something ?
while [ 1 ]
do
smwebsocket “$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
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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